Chalk
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Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard
Beachy Head is a part of the extensive Southern England Chalk Formation.
"Nitzana Chalk curves" situated at Western Negev, Israel, are chalk deposits formed in the Mesozoic era's Tethys Ocean
Open chalk pit, Seale, Surrey, UK
Chalk from the White Cliffs of Dover, England
Limestone
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Limestone is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calci
Chalk
…Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts of organisms, mostly microscopic…
Limestone outcrop in the Torcal de Antequera nature reserve of Málaga, Spain
This limestone deposit in the karst of Dinaric Alps near Sinj, Croatia, was formed in the Eocene.
Ooids from a beach on Joulter's Cay, The Bahamas
Ooids in limestone of the Carmel Formation (Middle Jurassic) of southwestern Utah.