Fossils of the Oxford Clay. London: Palaeontological by Martill D.M., Hudson J.D.

By Martill D.M., Hudson J.D.

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Extra resources for Fossils of the Oxford Clay. London: Palaeontological Association

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Controversy on their life habits continues, but their abundance does seem to vary independently of the 'normal' benthos. Many Oxford Clay bivalves occur in shell-beds, some of which are mere winnowed concentrations, but others formed distinct habitats, notably the Gryphaea shell-beds of the lower part of the Lower Oxford Clay. Bivalves requiring a firm sea-floor, including Gryphaea and most infaunal filter-feeders, are poorly represented in the main part of the Lower Oxford Clay, but re-appear in the Middle and Upper divisions, where diversity increases but abundance decreases.

4, left valve, silicone rubber cast, x 1-5. 5, right valve, x 2-5. Lower Oxford Clay (jason Zone), Stewartby, Bedfordshire (p. 48). Figs 6, 7. Bositra buchii (Roemer). 6, articulated valves, Lower Oxford Clay (coronatum Zone), Stewartby, Bedfordshire, x 2-5. 7, typical 'plaster' of shells, Lower Oxford Clay (jason Zone), Chickerell, Dorset, x 1 (p. 48). Fig. 8. Leftvalve,LowerOxfordClay,Wiltshire, x 1-5 (p. 45). Fig. 9. Entolium (Entolium) corneolum (Young & Bird). Left valve, Hackness Rock, Scarborough, Yorkshire, x 1 (p.

5 Description. Small to medium-sized species (4-13 mm high), of subovate to suborbicular outline, known only from right valves. Similar to E. corneolum but differs in possessing a well developed byssal notch beneath the anterior auricle of the right valve; ctenolium absent. Remarks. This species occurs frequently in the coronatum Zone Lower Oxford Clay of central England, but is rare at all other horizons. Specimens are normally covered with a coating of secondary calcite on their external surface, preventing a view of the ornament, but it is likely that the species is smooth shelled.

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