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Encyclopedia > Gault clay

The Gault Clay is a formation of stiff blue clay deposited in a calm, fairly deep water marine environment during the Lower Cretaceous Period (Upper and Middle Albian). It is well exposed in the costal cliffs at Copt Point in Folkestone, Kent, England, where it overlays the Lower Greensand Formation.

The Gault Clay often contains numerous phosphatic nodules and may also contain sand as well as small grains of the mineral glauconite. Crystals of the mineral selenite are fairly common in places, as are nodules of pyrite.

The Gault Clay yields abundant marine fossils, including ammonites (such as Hoplites, Hamites, Euhoplites, Anahoplites, and Dimorphoplites), belemnites (such as Neohibolites), bivalves (such as Birostrina and Pectinucula), gastropods (such as Anchura), solitary corals, fish remains (including shark teeth), scattered crinoid remains, and crustaceans (such as the crab Notopocorystes). Occasional fragments of fossil wood may also be found.

The Gault Formation consists of both the Gault Clay and Upper Greensand.

The Gault exposure at Copt Point, which is the type locality for the formation, is 40 m in thickness.

See also

  Results from FactBites:
Gault - LoveToKnow 1911 (605 words)
In the south of England the Gault clay is fairly constant in the lower part, with the Greensand above; the clay, however, passes into sand as it is followed westward and, as already pointed out, the clay and sand appear to pass into a red chalk towards the north-east.
The Gault (with Upper Greensand) passes on to the Jurassic and Rhaetic rocks near Axmouth, and oversteps farther westward, in the Haldon Hills, on to the Permian.
In the Diester and Teutoberger Wald, and in the region of Halberstadt, the clays and marls are replaced by sandstones, the so-called Gault-Quader.
CMG: Mineralogical Society: Special Interest Groups (439 words)
The group publishes reference monographs on specific aspects of clay science, is responsible for the journal Clay Minerals, and sponsors the annual George Brown Lecture.
Clays of the Chalk: effects on structure, groundwater and slope stability.
The Salcombe Regis Landslip (2006): deformation and flowstudies of the Gault and Upper Greensand.
  More results at FactBites »



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