The Berkeley Hills are a range of the Pacific Coast Ranges that overlook the northeast side of the valley that encompasses San Francisco Bay. They were called the "Contra Costa Range/Hills", but with the establishment of Berkeley and the University of California, the current usage was applied by geographers and gazetteers; the Berkeley Hills are bounded by the major Hayward Fault along their western base, the minor Wildcat fault on their eastern side. The highest peaks are Grizzly Peak and Round Top, an extinct volcano, William Rust Summit 1,004 feet. Vollmer Peak, although thought to be part of the Berkeley Hills is located on the adjacent San Pablo Ridge near the point where it meets the Berkeley Hills at the head of Wildcat Canyon. Vollmer Peak was named in honor of the first police chief of the City of August Vollmer, it was known as "Bald Peak". Much of the west slope of the Berkeley Hills has residential neighborhoods of single family homes, except on the land of University of California, Berkeley.
Most streets are narrow and tend to follow the contours of the land, although three streets, Marin Avenue, Moeser Lane, Potrero Avenue, run directly toward the ridgeline. Other roads to the ridgeline wind their way up the canyons. Grizzly Peak and Skyline Boulevards follow the top of the ridge. Many neighborhoods in the south Berkeley hills are home to the more affluent residents of Berkeley and Oakland due to their relative remoteness and undeveloped forest charm; the east slope of the Berkeley Hills is preserved or developed wildland, much of it owned by the East Bay Regional Park District and the East Bay Municipal Utility District. From north to south, the parks are Wildcat Canyon Regional Park, Tilden Regional Park, Sibley Volcanic Regional Park, Huckleberry Botanic Regional Preserve, Redwood Regional Park, Anthony Chabot Regional Park, Lake Chabot Regional Park, Cull Canyon Regional Recreation Area. Claremont Canyon Regional Preserve, Temescal Regional Park are lower on the western slopes while Las Trampas Regional Wilderness is lower on the eastern slope above Danville.
The Berkeley Hills are pierced by several tunnels. Two are aqueducts of EBMUD; the four bores of the Caldecott Tunnel carry State Highway 24 between Oakland and Contra Costa County. It is common to hear the term, "Oakland Hills" to refer to that section of the Berkeley Hills that runs along the east side of Oakland; as a proper name or recognized toponym, it is technically incorrect. When used on maps, the exact south end of the "Berkeley Hills" is unclear, but the maps of the USGS show them stretching well south into the northeastern portion of Oakland, it does not, in any case, correspond to any political boundaries, only to a geographic feature. The ridge extends south through Oakland and San Leandro to the drainage of San Leandro Creek called Castro Valley, geologically, continues southward above the line of the Hayward Fault. In the section above East Oakland to Castro Valley, the ridge appears on most maps as the San Leandro Hills; the northern extent of the proper name "Berkeley Hills" is less indefinite.
The eastern slopes of the Berkeley Hills lie outside of the city of Berkeley within Contra Costa County. Another common usage is East Bay Hills, it may refer to all of the ranges east of the Bay, from the Berkeley Hills to the Diablo Range and all the ranges between. The Berkeley Hills affect the local climate by their elevation; the oceanic marine layer, which develops during the summer, bringing fog and low clouds with it, is less than 2,000 feet deep and thus is blocked by the range. This produces a "fog shadow" effect to the east, warmer than areas west of the hills; the westerly wind that carries the marine layer through the Golden Gate splits its flow as it hits the Berkeley Hills producing a southerly wind from Berkeley northward and a northerly wind in the direction of Oakland. In winter during spells of tule fog inland, a reverse situation occurs, with the fog confined to areas east of the hills, although the inland fog pours in from the north, around the hills by way of the Carquinez Strait.
The Berkeley Hills affect rainfall. Cold storms deposit wet snow on the peaks. In spring and fall, sinking air from aloft combining with inland high pressure periodically sends hot and gusty winds across the ridges of the Berkeley Hills, posing a fire danger, which in the 20th century produced several wildfires, two of which caused major damage to Berkeley and Oakland.. The California Earthquake of April 18, 1906: Report of the State Earthquake Investigation Commission, Andrew C. Lawson, Carnegie Institution of Washington Publication 87, 2 vols. - Available online at this USGS webpage. The Berkeley Hills, a De
Rock climbing is a sport in which participants climb up, down or across natural rock formations or artificial rock walls. The goal is to reach the summit of a formation or the endpoint of a pre-defined route without falling. Professional rock climbing competitions have the objectives of either completing the route in the quickest possible time or attaining the farthest point on an difficult route. Due to the length of time and extended endurance required, because accidents are most to happen on the descent, rock climbers do not climb back down the route, or "downclimb" on the larger multiple pitch class III–IV, or multi-day grade IV–VI climbs. Rock climbing is a physically and mentally demanding sport, one that tests a climber's strength, endurance and balance along with mental control, it can be a dangerous activity and knowledge of proper climbing techniques and use of specialized climbing equipment is crucial for the safe completion of routes. Because of the wide range and variety of rock formations around the world, rock climbing has been separated into several different styles and sub-disciplines, such as scrambling, another activity involving the scaling of hills and similar formations, differentiated by rock climbing's sustained use of hands to support the climber's weight as well as to provide balance.
Paintings dating from 200 BC show Chinese men rock climbing. In early America, the cliff-dwelling Anasazi in the 12th century are thought to have been excellent climbers. Early European climbers used rock climbing techniques as a skill required to reach the summit in their mountaineering exploits. In the 1880s, European rock climbing became an independent pursuit outside of mountain climbing. Although rock climbing was an important component of Victorian mountaineering in the Alps, it is thought that the sport of rock climbing began in the last quarter of the nineteenth century in various parts of Europe. Rock climbing evolved from an alpine necessity to a distinct athletic activity. Aid climbing, climbing using equipment that acts as artificial handhold or footholds, became popular during the period 1920–1960, leading to ascents in the Alps and in Yosemite Valley that were considered impossible without such means. However, climbing techniques and ethical considerations have evolved steadily.
Today, free climbing, climbing using holds made of natural rock while using gear for protection and not for upward movement, is the most popular form of the sport. Free climbing has since been divided into several sub-styles of climbing dependent on belay configuration. Over time, grading systems have been created in order to compare more the relative difficulties of the rock climbs. In How to Rock Climb, John Long notes that for moderately skilled climbers getting to the top of a route is not enough. Within free climbing, there are distinctions given to ascents: on-sight and redpoint. To on-sight a route is to ascend the wall without aid or any foreknowledge, it is considered the way to climb with the most style. Flashing is similar to on-sighting, except that the climber has previous information about the route including talking about the beta with other climbers. Redpointing means to make a free ascent of the route after having first tried it. Style is up to each individual climber and among climbers the verbiage and definitions can differ.
Most of the climbing done in modern times is considered free climbing—climbing using one's own physical strength, with equipment used as protection and not as support—as opposed to aid climbing, the gear-dependent form of climbing, dominant in the sport's earlier days. Free climbing is divided into several styles that differ from one another depending on the choice of equipment used and the configurations of their belay and anchor systems; as routes get higher off the ground, the increased risk of life-threatening injuries necessitates additional safety measures. A variety of specialized climbing techniques and climbing equipment exists to provide that safety. Climbers will work in pairs and utilize a system of ropes and anchors designed to catch falls. Ropes and anchors can be configured in different ways to suit many styles of climbing, roped climbing are thus divided into further sub-types that vary based on how their belay systems are set up. Speaking, beginners will start with top roping and/or easy bouldering and work their way up to lead climbing and beyond.
Still the most popular method of climbing big walls, aid climbers make progress up a wall by placing and weighting gear, used directly to aid ascent and enhance safety. This form of climbing is used when ascent is too technically difficult or impossible for free climbing; the most used method to ascend climbs refers to climbs where the climber's own physical strength and skill are relied on to accomplish the climb. Free climbing may rely on top rope belay systems, or on lead climbing to establish protection and the belay stations. Anchors and protection are used to back up the climber and are passive as opposed to active ascending aids. Subtypes of free climbing are trad sport climbing. Free climbing is done as "clean lead" meaning no pitons or pins are used as protection. Climbing on short, low routes without the use of the safety rope, typical of most other styles. Protection, if used at all consists of a cushioned bouldering pad below the route and a spotter, a person who watches from below and directs the fall of the climber away from hazardous areas.
Bouldering may be an arena for intense and safe competition, resulting in exceptionally high diffic
San Francisco Bay
San Francisco Bay is a shallow estuary in the US state of California. It is surrounded by a contiguous region known as the San Francisco Bay Area, is dominated by the large cities of San Jose, San Francisco and Oakland. San Francisco Bay drains water from 40 percent of California. Water from the Sacramento and San Joaquin rivers, from the Sierra Nevada mountains, flow into Suisun Bay, which travels through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay; the Guadalupe River enters the bay at its southernmost point in San Jose. The Guadalupe drains water from the Santa Cruz mountains and Hamilton Mountain ranges in southernmost San Jose, it enters the bay at the town of Alviso. It connects to the Pacific Ocean via the Golden Gate strait. However, this entire group of interconnected bays is called the San Francisco Bay; the bay was designated a Ramsar Wetland of International Importance on February 2, 2012. The bay covers somewhere between 400 and 1,600 square miles, depending on which sub-bays, wetlands, so on are included in the measurement.
The main part of the bay measures three to twelve miles wide east-to-west and somewhere between 48 miles 1 and 60 miles 2 north-to-south. It is the largest Pacific estuary in the Americas; the bay was navigable as far south as San Jose until the 1850s, when hydraulic mining released massive amounts of sediment from the rivers that settled in those parts of the bay that had little or no current. Wetlands and inlets were deliberately filled in, reducing the Bay's size since the mid-19th century by as much as one third. Large areas of wetlands have been restored, further confusing the issue of the Bay's size. Despite its value as a waterway and harbor, many thousands of acres of marshy wetlands at the edges of the bay were, for many years, considered wasted space; as a result, soil excavated for building projects or dredged from channels was dumped onto the wetlands and other parts of the bay as landfill. From the mid-19th century through the late 20th century, more than a third of the original bay was filled and built on.
The deep, damp soil in these areas is subject to soil liquefaction during earthquakes, most of the major damage close to the Bay in the Loma Prieta earthquake of 1989 occurred to structures on these areas. The Marina District of San Francisco, hard hit by the 1989 earthquake, was built on fill, placed there for the Panama-Pacific International Exposition, although liquefaction did not occur on a large scale. In the 1990s, San Francisco International Airport proposed filling in hundreds more acres to extend its overcrowded international runways in exchange for purchasing other parts of the bay and converting them back to wetlands; the idea was, remains, controversial. There are five large islands in San Francisco Bay. Alameda, the largest island, was created when a shipping lane was cut to form the Port of Oakland in 1901, it is now a suburban community. Angel Island was known as "Ellis Island West" because it served as the entry point for immigrants from East Asia, it is now a state park accessible by ferry.
Mountainous Yerba Buena Island is pierced by a tunnel linking the east and west spans of the San Francisco–Oakland Bay Bridge. Attached to the north is the artificial and flat Treasure Island, site of the 1939 Golden Gate International Exposition. From the Second World War until the 1990s, both islands served as military bases and are now being redeveloped. Isolated in the center of the Bay is Alcatraz, the site of the famous federal penitentiary; the federal prison on Alcatraz Island no longer functions, but the complex is a popular tourist site. Despite its name, Mare Island in the northern part of the bay is a peninsula rather than an island. San Francisco Bay is thought to represent a down-warping of the Earth's crust between the San Andreas Fault to the west and the Hayward Fault to the east, though the precise nature of this remains under study. About 560,000 years ago, a tectonic shift caused the large inland Lake Corcoran to spill out the central valley and through the Carquinez Strait, carving out sediment and forming canyons in what is now the northern part of the San Francisco Bay and Golden Gate strait.
Until the last ice age, the basin, now filled by the San Francisco Bay was a large linear valley with small hills, similar to most of the valleys of the Coast Ranges. As the great ice sheets began to melt, around 11,000 years ago, the sea level started to rise. By 5000 BC the sea level rose 300 feet; the valley become a bay, the small hills became islands. From 15,000 – 10,000 years ago, the Ohlone tribe inhabited the area, now the San Francisco Bay; the natives were displaced 5,000 years ago as the bay filled with water due to the rising sea level at the end of the ice age. The first European to see San Francisco Bay is N. de Morena, left at New Albion at Drakes Bay in Marin County, California by Sir Francis Drake in 1579 and walked to Mexico. The first recorded European discovery of San Francisco Bay was on November 4, 1769 when Spanish explorer Gaspar de Portolà, unable to find the port of Monterey, continued north close to what is now Pacifica and reached the summit of the 1,200-foot-high Sweeney Ridge, now marked as the place where he first sighted San Francisco Bay.
Portolá and his party did not realize what they had discovered, thinking they had arrived at a large arm of what is now called Drakes Bay. At the time, Drakes Bay went by the name Bahia de San
Rhyolite is an igneous, volcanic rock, of felsic composition. It may have any texture from glassy to aphanitic to porphyritic; the mineral assemblage is quartz and plagioclase. Biotite and hornblende are common accessory minerals, it is the extrusive equivalent to granite. Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, outcrops of rhyolite may bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolitic magmas form viscous lavas, they occur as breccias or in volcanic plugs and dikes. Rhyolites that cool too to grow crystals form a natural glass or vitrophyre called obsidian. Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic and lithophysal structures; some rhyolite is vesicular pumice. Many eruptions of rhyolite are explosive and the deposits may consist of fallout tephra/tuff or of ignimbrites. Eruptions of rhyolite are rare compared to eruptions of less felsic lavas.
Only three eruptions of rhyolite have been recorded since the start of the 20th century: at the St. Andrew Strait volcano in Papua New Guinea, Novarupta volcano in Alaska, Chaiten in southern Chile. Rhyolite has been found on islands far from land. Etsch Valley Vulcanite Group near Bolzano and the surrounding area Gréixer rhyolitic complex at Moixeró range Vosges Iceland: all active and extinct central volcanoes, e.g. Torfajökull, Leirhnjúkur / Krafla, Breiddalur central volcano Papa Stour in Shetland Copper Coast Geopark in southeast Ireland various locations around Snowdonia, Wales Massif de l'Esterel, France the Thuringian Forest consists of rhyolites and pyroclastic rocks of the Rotliegendes Saxony the north west Saxony-Anhalt north of Halle Saar-Nahe Basin e.g. the Königstuhl on the Donnersberg mountain Black Forest e.g. on the Karlsruher Grat Odenwald Andes Cascade Range Cobalt, Ontario Sheep Creek, Idaho Rocky Mountains Jemez Mountains Rhyolite, Nevada was named after a rhyolite deposit that characterised the area.
Wichita Mountains within the Southern Oklahoma Aulacogen St. Francois Mountains Mount Jasper, New Hampshire Yellowstone Crater Lake, Oregon Palisade Head, a formation found at Tettegouche State Park, Minnesota; the Taupo Volcanic Zone in New Zealand has a large concentration of young rhyolite volcanoes Glass House Mountains National Park, Australia the Gondwana Rainforests of Australia World Heritage Area contains rhyolite-restricted flora along the Great Dividing Range the Flinders Peak Group in the Teviot Range in the Fassifern Valley is a rhyolite of varying colours. The Malani Igneous Suite, India; the Yandang Shan mountain chain, near the town of Wenzhou, Zhejiang province, China Tambora, Indonesia Mount Kilimanjaro, Kenya/Tanzania The name rhyolite was introduced into geology in 1860 by the German traveler and geologist Ferdinand von Richthofen from the Greek word rhýax and the rock name suffix "-lite". In North American pre-historic times, rhyolite was quarried extensively in eastern Pennsylvania in the United States.
Among the leading quarries was the Carbaugh Run Rhyolite Quarry Site in Adams County. Rhyolite was mined there starting 11,500 years ago. Tons of rhyolite were traded across the Delmarva Peninsula, because the rhyolite kept a sharp point when knapped and was used to make spear points and arrowheads. Comendite – A hard, peralkaline igneous rock, a type of light blue grey rhyolite List of rock types – A list of rock types recognized by geologists Pantellerite – A peralkaline rhyolite type of volcanic rock Thunderegg – A nodule-like rock, formed within rhyolitic volcanic ash layers University of North Dakota description of rhyolite Information from rocks-rock.com
San Francisco the City and County of San Francisco, is the cultural and financial center of Northern California. San Francisco is the 13th-most populous city in the United States, the fourth-most populous in California, with 884,363 residents as of 2017, it covers an area of about 46.89 square miles at the north end of the San Francisco Peninsula in the San Francisco Bay Area, making it the second-most densely populated large US city, the fifth-most densely populated U. S. county, behind only four of the five New York City boroughs. San Francisco is part of the fifth-most populous primary statistical area in the United States, the San Jose–San Francisco–Oakland, CA Combined Statistical Area; as of 2017, it was the seventh-highest income county in the United States, with a per capita personal income of $119,868. As of 2015, San Francisco proper had a GDP of $154.2 billion, a GDP per capita of $177,968. The San Francisco CSA was the country's third-largest urban economy as of 2017, with a GDP of $907 billion.
Of the 500+ primary statistical areas in the US, the San Francisco CSA had among the highest GDP per capita in 2017, at $93,938. San Francisco was ranked 14th in the world and third in the United States on the Global Financial Centres Index as of September 2018. San Francisco was founded on June 29, 1776, when colonists from Spain established Presidio of San Francisco at the Golden Gate and Mission San Francisco de Asís a few miles away, all named for St. Francis of Assisi; the California Gold Rush of 1849 brought rapid growth, making it the largest city on the West Coast at the time. San Francisco became a consolidated city-county in 1856. San Francisco's status as the West Coast's largest city peaked between 1870 and 1900, when around 25% of California's population resided in the city proper. After three-quarters of the city was destroyed by the 1906 earthquake and fire, San Francisco was rebuilt, hosting the Panama-Pacific International Exposition nine years later. In World War II, San Francisco was a major port of embarkation for service members shipping out to the Pacific Theater.
It became the birthplace of the United Nations in 1945. After the war, the confluence of returning servicemen, significant immigration, liberalizing attitudes, along with the rise of the "hippie" counterculture, the Sexual Revolution, the Peace Movement growing from opposition to United States involvement in the Vietnam War, other factors led to the Summer of Love and the gay rights movement, cementing San Francisco as a center of liberal activism in the United States. Politically, the city votes along liberal Democratic Party lines. A popular tourist destination, San Francisco is known for its cool summers, steep rolling hills, eclectic mix of architecture, landmarks, including the Golden Gate Bridge, cable cars, the former Alcatraz Federal Penitentiary, Fisherman's Wharf, its Chinatown district. San Francisco is the headquarters of five major banking institutions and various other companies such as Levi Strauss & Co. Gap Inc. Fitbit, Salesforce.com, Reddit, Inc. Dolby, Weebly, Pacific Gas and Electric Company, Pinterest, Uber, Mozilla, Wikimedia Foundation and Weather Underground.
It is home to a number of educational and cultural institutions, such as the University of San Francisco, University of California, San Francisco, San Francisco State University, the De Young Museum, the San Francisco Museum of Modern Art, the California Academy of Sciences. As of 2019, San Francisco is the highest rated American city on world liveability rankings; the earliest archaeological evidence of human habitation of the territory of the city of San Francisco dates to 3000 BC. The Yelamu group of the Ohlone people resided in a few small villages when an overland Spanish exploration party, led by Don Gaspar de Portolà, arrived on November 2, 1769, the first documented European visit to San Francisco Bay. Seven years on March 28, 1776, the Spanish established the Presidio of San Francisco, followed by a mission, Mission San Francisco de Asís, established by the Spanish explorer Juan Bautista de Anza. Upon independence from Spain in 1821, the area became part of Mexico. Under Mexican rule, the mission system ended, its lands became privatized.
In 1835, Englishman William Richardson erected the first independent homestead, near a boat anchorage around what is today Portsmouth Square. Together with Alcalde Francisco de Haro, he laid out a street plan for the expanded settlement, the town, named Yerba Buena, began to attract American settlers. Commodore John D. Sloat claimed California for the United States on July 7, 1846, during the Mexican–American War, Captain John B. Montgomery arrived to claim Yerba Buena two days later. Yerba Buena was renamed San Francisco on January 30 of the next year, Mexico ceded the territory to the United States at the end of the war. Despite its attractive location as a port and naval base, San Francisco was still a small settlement with inhospitable geography; the California Gold Rush brought a flood of treasure seekers. With their sourdough bread in tow, prospectors accumulated in San Francisco over rival Benicia, raising the population from 1,000 in 1848 to 25,000 by December 1849; the promise of great wealth was so strong that crews on arriving vessels deserted and rushed off to the gold fields, leaving behind a forest of masts in San Francisco harbor.
Some of these 500 abandoned ships were used at times as storeships and hotels.
The Ohlone, named Costanoan by early Spanish colonists, are a Native American people of the Northern California coast. When Spanish explorers and missionaries arrived in the late 18th century, the Ohlone inhabited the area along the coast from San Francisco Bay through Monterey Bay to the lower Salinas Valley. At that time they spoke a variety of related languages; the Ohlone languages belonged to the Costanoan sub-family of the Utian language family, which itself belongs to the proposed Penutian language phylum. The term "Ohlone" has been used in place of "Costanoan" since the 1970s by some tribal groups and by most ethnographers and writers of popular literature. In pre-colonial times, the Ohlone lived in more than 50 distinct landholding groups, did not view themselves as a distinct group, they lived by hunting and gathering, in the typical ethnographic California pattern. The members of these various bands interacted with one another; the Ohlone people practiced the Kuksu religion. Prior to the Gold Rush, the northern California region was one of the most densely populated regions north of Mexico.
However, the arrival of Spanish colonizers to the area in 1769 vastly changed tribal life forever. The Spanish constructed Missions along the California coast with the objective of Christianizing the native people and culture. Between the years 1769 and 1834, the number of Indigenous Californians dropped from 300,000 to 250,000. After California entered into the Union in 1850, the state government perpetrated massacres against the Ohlones. Many of the leaders of these massacres were rewarded with positions in state and federal government; these massacres have been described as genocide. Many are now leading a push for cultural and historical recognition of their tribe and what they have gone through and had taken from them; the Ohlone living today belong to one or another of a number of geographically distinct groups, but not all, in their original home territory. The Muwekma Ohlone Tribe has members from around the San Francisco Bay Area, is composed of descendants of the Ohlones/Costanoans from the San Jose, Santa Clara, San Francisco missions.
The Ohlone/Costanoan Esselen Nation, consisting of descendants of intermarried Rumsen Costanoan and Esselen speakers of Mission San Carlos Borromeo, are centered at Monterey. The Amah-Mutsun Tribe are descendants of Mutsun Costanoan speakers of Mission San Juan Bautista, inland from Monterey Bay. Most members of another group of Rumsien language, descendants from Mission San Carlos, the Costanoan Rumsien Carmel Tribe of Pomona/Chino, now live in southern California; these groups, others with smaller memberships are separately petitioning the federal government for tribal recognition. The Ohlone inhabited fixed village locations, moving temporarily to gather seasonal foodstuffs like acorns and berries; the Ohlone people lived in Northern California from the northern tip of the San Francisco Peninsula down to northern region of Big Sur, from the Pacific Ocean in the west to the Diablo Range in the east. Their vast region included the San Francisco Peninsula, Santa Clara Valley, Santa Cruz Mountains, Monterey Bay area, as well as present-day Alameda County, Contra Costa County and the Salinas Valley.
Prior to Spanish contact, the Ohlone formed a complex association of 50 different "nations or tribes" with about 50 to 500 members each, with an average of 200. Over 50 distinct Ohlone tribes and villages have been recorded; the Ohlone villages interacted through trade and ceremonial events, as well as some internecine conflict. Cultural arts included basket-weaving skills, seasonal ceremonial dancing events, female tattoos and nose piercings, other ornamentation; the Ohlone subsisted as hunter-gatherers and in some ways harvesters. "A rough husbandry of the land was practiced by annually setting of fires to burn-off the old growth in order to get a better yield of seeds—or so the Ohlone told early explorers in San Mateo County." Their staple diet consisted of crushed acorns, grass seeds, berries, although other vegetation and trapped game and seafood, were important to their diet. These food sources were abundant in earlier times and maintained by careful work, through active management of all the natural resources at hand.
Animals in their mild climate included the grizzly bear, elk and deer. The streams held salmon and stickleback. Birds included plentiful ducks, quail, great horned owls, red-shafted flickers, downy woodpeckers and yellow-billed magpies. Waterfowl were the most important birds in the people's diet, which were captured with nets and decoys; the Chochenyo traditional narratives refer to ducks as food, Juan Crespí observed in his journal that geese were stuffed and dried "to use as decoys in hunting others". Along the ocean shore and bays, there were otters, at one time thousands of sea lions. In fact, there were so many sea lions that according to Crespi it "looked like a pavement" to the incoming Spanish. In general, along the bayshore and valleys, the Ohlone constructed dome-shaped houses of woven or bundled mats of tules, 6 to 20 feet in diameter. In hills where redwood trees were accessible, they built conical houses from redwood bark attached to a frame of wood. Residents of Monterey recall Redwood houses.
One of the main village buildings, the sweat lodge was low into the ground, its walls made of earth and roof of earth and brush. They built boats of tule to navigate on the bays propelled by double-bladed paddles. Men did not
International Standard Serial Number
An International Standard Serial Number is an eight-digit serial number used to uniquely identify a serial publication, such as a magazine. The ISSN is helpful in distinguishing between serials with the same title. ISSN are used in ordering, interlibrary loans, other practices in connection with serial literature; the ISSN system was first drafted as an International Organization for Standardization international standard in 1971 and published as ISO 3297 in 1975. ISO subcommittee TC 46/SC 9 is responsible for maintaining the standard; when a serial with the same content is published in more than one media type, a different ISSN is assigned to each media type. For example, many serials are published both in electronic media; the ISSN system refers to these types as electronic ISSN, respectively. Conversely, as defined in ISO 3297:2007, every serial in the ISSN system is assigned a linking ISSN the same as the ISSN assigned to the serial in its first published medium, which links together all ISSNs assigned to the serial in every medium.
The format of the ISSN is an eight digit code, divided by a hyphen into two four-digit numbers. As an integer number, it can be represented by the first seven digits; the last code digit, which may be 0-9 or an X, is a check digit. Formally, the general form of the ISSN code can be expressed as follows: NNNN-NNNC where N is in the set, a digit character, C is in; the ISSN of the journal Hearing Research, for example, is 0378-5955, where the final 5 is the check digit, C=5. To calculate the check digit, the following algorithm may be used: Calculate the sum of the first seven digits of the ISSN multiplied by its position in the number, counting from the right—that is, 8, 7, 6, 5, 4, 3, 2, respectively: 0 ⋅ 8 + 3 ⋅ 7 + 7 ⋅ 6 + 8 ⋅ 5 + 5 ⋅ 4 + 9 ⋅ 3 + 5 ⋅ 2 = 0 + 21 + 42 + 40 + 20 + 27 + 10 = 160 The modulus 11 of this sum is calculated. For calculations, an upper case X in the check digit position indicates a check digit of 10. To confirm the check digit, calculate the sum of all eight digits of the ISSN multiplied by its position in the number, counting from the right.
The modulus 11 of the sum must be 0. There is an online ISSN checker. ISSN codes are assigned by a network of ISSN National Centres located at national libraries and coordinated by the ISSN International Centre based in Paris; the International Centre is an intergovernmental organization created in 1974 through an agreement between UNESCO and the French government. The International Centre maintains a database of all ISSNs assigned worldwide, the ISDS Register otherwise known as the ISSN Register. At the end of 2016, the ISSN Register contained records for 1,943,572 items. ISSN and ISBN codes are similar in concept. An ISBN might be assigned for particular issues of a serial, in addition to the ISSN code for the serial as a whole. An ISSN, unlike the ISBN code, is an anonymous identifier associated with a serial title, containing no information as to the publisher or its location. For this reason a new ISSN is assigned to a serial each time it undergoes a major title change. Since the ISSN applies to an entire serial a new identifier, the Serial Item and Contribution Identifier, was built on top of it to allow references to specific volumes, articles, or other identifiable components.
Separate ISSNs are needed for serials in different media. Thus, the print and electronic media versions of a serial need separate ISSNs. A CD-ROM version and a web version of a serial require different ISSNs since two different media are involved. However, the same ISSN can be used for different file formats of the same online serial; this "media-oriented identification" of serials made sense in the 1970s. In the 1990s and onward, with personal computers, better screens, the Web, it makes sense to consider only content, independent of media; this "content-oriented identification" of serials was a repressed demand during a decade, but no ISSN update or initiative occurred. A natural extension for ISSN, the unique-identification of the articles in the serials, was the main demand application. An alternative serials' contents model arrived with the indecs Content Model and its application, the digital object identifier, as ISSN-independent initiative, consolidated in the 2000s. Only in 2007, ISSN-L was defined in the