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KIMERIDGIAN
, in See also:geology, the basal See also:division of the Upper Oolites in the See also:Jurassic See also:system
.
The name is derived from the See also:hamlet of Kimeridge or Kimmeridge near the See also:coast of See also:Dorset-See also:shire, See also:England
.
It appears to have been first suggested by T
.
See also:Webster in 1812; in 1818, in the See also:form Kimeridge See also:Clay, it was used by See also:Buckland
.
From the See also:Dorsetshire coast, where it is splendidly exposed in the See also:fine cliffs from St See also:Alban's See also:Head to See also:Gad Cliff, it follows the See also:line of Jurassic outcrop through Wilt-shire, where there is a broad expanse between See also:Westbury and See also:Devizes, as far as See also:Yorkshire, there it appears in the vale of See also:Pickering and on the coast in See also:Filey See also:Bay
.
It generally occupied broad valleys, of which the vale of See also:Aylesbury may be taken as typical
.
See also:Good exposures occur at Seend, See also:Caine, See also:Swindon, Wootton Bassett, See also:Faringdon, See also:Abingdon, Culham, Shotover See also: Cardioceras alternans is the zonal ammonite characteristic of the lower division, with the sub-zone of Ostrea deltoidea in the lower portion . Exogyra virgula is See also:common in the upper See also:part of the lower division, and the lower part of the Upper Kimeridgian . A large number of See also:ammonites are See also:peculiar to this formation, including Reineckia See also:eudoxus, R . Thurmanni, Aspidoceras longispinus, &c . Large dinosaurian See also:reptiles are abundant, Cetiosaurus, Gigantosaurus, Megalosaurus, also plesiosaurs and ichthyosaurs; crocodilian and chelonian remains are also found . Protocardia striatula, Thracia depressa, Belemnites abreviatus, B . Blainvillei, Lingula ovalis, Rhynchonella inconstans and Exogyra nana are characteristic fossils . See also:Alum has been obtained from the Kimeridge Clay, and the cement-stones have been employed in Purbeck; See also:coprolites are found in small quantities . Bricks, tiles, See also:flower-pots, &c., are made from the clay at Swindon, See also:Gillingham, Brill, Ely, Horncastle, and other places . The so-called "Kimeridge See also:coal" is a highly bituminous shale cap-able of being used as See also:fuel, which has been worked on the cliff at Little Kimeridge . The " Kimeridgien " of See also:continental geologists is usually made to contain the three sub-divisions of A . See also:Oppel and W .
See also:Waagen,
Upper (Virgulian) with Exogyra virgula Kimeridgien See also:Middle (Pteroceran) with Pteroceras oceani
Lower (Astartian) with See also:Astarte supracorallina; but the upper portion of this continental Kimeridgian is See also:equivalent to some of the See also:British Portlandian; while most of the Astartian corresponds to the See also:Corallian
.
A. de See also:Lapparent now recognizes only the Virgulian and Pteroceran in the Kimeridgien
.
Clays and marls with occasional limestones and sandstones represent the Kimeridgien of most of See also:northern See also:Europe, including See also:Russia
.
In See also:Swabia and some other parts of See also:Germany the curious ruiniform See also:marble Felsenkalk occurs on this See also:horizon, and most of the Kimeridgien of See also:southern Europe, including the See also:Alps, is calcareous
..
Representatives of the formation occur in See also:Caucasia, See also:Algeria, See also:Abyssinia, See also:Madagascar; in South See also:America with volcanic rocks, and possibly in See also:California (Maripan beds), See also:Alaska and See also: |
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