Arthur Lakes was an American geologist, artist, writer, teacher and Episcopalian minister. He captured much of his geological and palaeontological field work in sketches and watercolours. Lakes is credited with successfully deciphering much of the geology of Colorado and, as an economic geologist, guiding mineral exploration which was so important to the State.
Lakes's sketch of expedition members in Como Bluff
Sketch of bones in skeleton by Arthur Lakes, 1879
The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone, sandstone, siltstone, and limestone and is light gray, greenish gray, or red. Most of the fossils occur in the green siltstone beds and lower sandstones, relics of the rivers and floodplains of the Jurassic period.
The distinctive banding of the Morrison Formation, a group of rock layers that occur throughout Dinosaur National Monument and the source of fossils like those found at the Dinosaur Quarry
Stratotypes for members of the Morrison Formation
Brushy Basin Member showing the purple and red colors of paleosols (ancient soils). East side of the San Rafael Swell, Emery County, Utah.
Gypsiferous facies of the Ralston Creek Member exposed in a road cut, Fremont County, Colorado.
