Fossils of the Oxford Clay by J. D. Hudson, David Martill

By J. D. Hudson, David Martill

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Isognomon (Isognomon) promytiloides Arkell. Left valve, Oxford Clay, Radipole, Dorset, x 1 (p. 46). Fig. 11. Parainoceramus subtilis (Lahusen). Right valve, Lower Oxford Clay, Wiltshire, x 0-75 (p. 45). ru/ 48 Fossils of the Oxford Clay Remarks. A distinctive species characterized by its hooked umbonal shape and flattened form. Age and distribution. Upper Oxford Clay (cordatum Zone) of Dorset. Superfamily P E C T I N A C E A Family P O S I D O N I I D A E Genus BOSITRA Bositra buchii (Roemer) Plate 2, figs 6 & 7 Description.

Sowerby. Left valve, Coralline Oolite (Oxfordian), Malton, Yorkshire, x 0-8 (p. 44). Fig. 19. Modiolus (Modiolus) bipartitus J. Sowerby. Right valve, Upper Oxford Clay (cordatum Zone), Weymouth, Dorset, x 0-7 (p. 43). ru/ 4b 40 Fossils of the Oxford Clay Age and distribution. Widespread throughout England in the Middle and Upper Oxford Clay (lamberti to cordatum Zones). Superfamily N U C U L A N A C E A Family M A L L E T I I D A E Genus MESOSACCELLA Mesosaccella morrisi (Deshayes) Plate 1, figs 6 & 7 Description.

Posterodorsal margin concave in outline, ventral margin smoothly rounded. Promi­ nent escutcheon, bounded by a well developed carina running from the umbones to the posterior angle, deeply impressed, with slight elevation along the hinge margin. Ornament of faint concentric growth lines over the whole shell surface. Taxodont hinge. Remarks. Occurs as articulated shells and internal moulds, often pyritized in the Upper Oxford Clay. The latter are very distinctive, due to the barbed appearance of the posterior area, caused by pyritization of the deeply impressed posterior adductor muscle scars.

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