By W.J. ARKELL
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Additional resources for Jurassic Geology of the World
Of beds with lumachelles of Ostrea acuminata Sowerby and some brachiopods. I n Dorset the clay is even thicker and equally little known. ), in which locally is a 6-inch marl band containing Viviparus langtonensis Hudleston, a gastropod presumed to have lived in fresh water (Watson, 1950). Zone of Zigzagiceras zigzag (d'Orbigny). T h e base of the Lower Fuller's E a r t h has yielded Oppelia fallax (Gueranger) and O. limosa (Buckman). U n d e r it in south Dorset is the Zigzag Bed, a 6-inch lime stone forming t h e top of t h e Inferior Oolite, b u t crowded with fossils of the Lower Bathonian.
Ru/ O O L I T E ) ^////////////////////////^SS^ C L A Y AND M A R L C O M PACT M U O S T O N E A N D M A R L S T O N E AND EVEN-8EDDfD FINE OOLITES FIG. —Diagrammatic horizontal section of the Bathonian from Lansdown, near Bath, to near Stow-on-the-Wold, to show the lateral passage of the Fuller's Earth facies into Great Oolite facies. From Arkell & Donovan, 1952. ru/ 3° THE B R I T I S H ISLES T o t h e same zone belong higher rock b a n d s in t h e lower part of t h e U p p e r Fuller's E a r t h in Dorset, the Wattonensis Beds (Kellaway & Wilson, 1941, p .
T h i s zone is never more than 1 ft. thick in south Dorset, and usually a mere seam with average thickness of 4 inches. I n n o r t h Dorset it expands into the Sherborne building-stone and Hadspen Stone. g. Maes Knoll conglomerate of D u n d r y Hill). ru/ 32 THE BRITISH ISLES Besides Garantiana, forms of Spiroceras are characteristic of the zone. Various Prorsisphinctes, Bigotites, etc. also occur. Zone of Strenoceras subfurcatum (Schlotheim). T h i s is the Niortensis Zone of Buckman, b u t S.