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By Cope J.C.W., Duff K.L., Parsons C.F., Torrens H.S., Wimbledon W.A., Wright J.K.

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Extra info for A correlation of Jurassic rocks in the British Isles. Part Two: Middle and Upper Jurassic

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42; Stinton & Torrens 1968, p. 247) which allow it to he assigned to the holladi Subzone of the discus Zone. The use of the Bradford Clay as a marker horizon away from the type area, where it is now included within the Forest Marble, is militated against because of its impersistence (Green & Donovan 1969, pp. 24, 43) and because its characteristic fauna is a facies fauna known to appear at a number of horizons when the right conditions of deposition prevailed (Cave 1977, p. 150). c. The Great Oolite has yielded ammonites in abundance only from the Twinhoe Ironshot (Torrens 1974a, p.

See details in Arkell & Donovan 1952 and Cave 1977). Ammonite control is largely unavailable and when present is often ambiguous. As an example, the loose specimen of Morrisiceras comma (S. S. Buckman) (BU 13462) from Kilcott, near Hawkeshury, has heen assigned to the Fuller's Earth Rock, the Dodington Ash Rock (Torrens 1969c, p. 70) and the Cross Hands Rock (Cave 1977, p. 142). It at least proves the morrisi Zone is present. For the remainder of the sequence ammonite control is largely lacking.

Praeexogyra hebridica, despite earlier statements, is apparently confined to the Lower Ostrea Beds within the Great Estuarine Group, although it also occurs in the Upper Ostrea Member of the Staffin Bay Formation above. Its range according to Cox & Arkell (1948-50) is 'throughout the Great Oolite from Chipping Norton Limestone and Sbarps Hill Beds onwards'. P. acuminata, which occurs with P. hebridica in the Sharp's Hill Beds of Oxfordshire does not occur in the Hebrides. This might suggest a closer comparison with higher horizons from the Hampen Mxly Formation to the Forest Marble Formation, which contain typical P.

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A correlation of Jurassic rocks in the British Isles. Part Two: Middle and Upper Jurassic by Cope J.C.W., Duff K.L., Parsons C.F., Torrens H.S., Wimbledon W.A., Wright J.K.


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