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The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone ...
Chalk is so common in Cretaceous marine beds that the Cretaceous Period was named for these deposits. The name Cretaceous was derived from Latin creta, meaning chalk. [10] Some deposits of chalk were formed after the Cretaceous. [11] The Chalk Group is a European stratigraphic unit deposited during the late Cretaceous Period.
A chalk loading onto a helicopter. In military terminology, a chalk is a group of paratroopers or other soldiers that deploy from a single aircraft. [1] A chalk often corresponds to a platoon-sized unit for air assault operations, or a company-minus-sized organization for airborne operations. For air transport operations, it can consist of up ...
The weight of overlying sediments caused the deposits to become consolidated into chalk. [9] British chalk deposits are considered stratigraphically to belong in the Chalk Group. Evidence of erosion along the cliff top. Due to the Alpine orogeny, a major mountain building event during the Cenozoic, the sea-floor deposits were raised above sea ...
The Chalk Marl is a geologic formation in England. [1] Consisting of mixed and layered chalk and marl, it preserves fossils dating back to the Cretaceous period. Today this formation within the Chalk Group is called the West Melbury Marly Chalk Formation. The Channel Tunnel was bored through Chalk Marl for its entire length. [2]
Across the north central and northern North Sea, the Chalk Group is a major seal unit, overlying a number of blocks of reservoir rocks and preventing their fluid contents from migrating upwards. The Silverpit crater, a 20 kilometers (12 mi) diameter suspected impact crater in the North Sea (60–65 Ma).
The hills are formed from a series of pure marine limestones formed during the Cretaceous period, known collectively as the Chalk Group.The outcrop has the form of an arc running north from Ferriby on the Humber estuary west of Hull northwards past Market Weighton to the Malton area where it swings eastwards towards the North Sea coast between Filey and Bridlington.
The Maastrichtian was introduced into scientific literature by Belgian geologist André Hubert Dumont in 1849, after studying rock strata of the Chalk Group close to the Dutch city of Maastricht. These strata are now classified as the Maastricht Formation – both the formation and stage derive their names from the city. [6]