. Bulletin of the British Museum (Natural History), Geology. 96 R. H. BATE from this lithology in a recognizable form. The basal limestone at Bogmire Gill was seen to be 3 feet, and is probably not very much thicker. The G. poUta Zone at Bloody Beck is 6 feet in thickness. Not only does this zone diminish considerably in thickness north and south away from the Hundale/Ravenscar area but it also thins westwards. The probable area covered by sediments of the G. polita Zone is shown in Text-fig 4. The most westerly outcrop of the Grey Limestone Series runs north/south through the Howardian Hills
. Bulletin of the British Museum (Natural History), Geology. 96 R. H. BATE from this lithology in a recognizable form. The basal limestone at Bogmire Gill was seen to be 3 feet, and is probably not very much thicker. The G. poUta Zone at Bloody Beck is 6 feet in thickness. Not only does this zone diminish considerably in thickness north and south away from the Hundale/Ravenscar area but it also thins westwards. The probable area covered by sediments of the G. polita Zone is shown in Text-fig 4. The most westerly outcrop of the Grey Limestone Series runs north/south through the Howardian Hills and consists of strongly arenaceous limestones interbedded with pure sand. In many cases decalcification of the limestone has resulted in the pro- duction of beds of sand. No complete section is exposed. Section 13 (Text-fig. 3) on Yearsley Moor exposes 8 ft. 3 in. of sandy limestone overlain by yellow sandstone of the Upper Deltaic Series. Further south at Stonecliff Wood, near Whitwell a NORTH SEA -Zone of Zone of Fig. 4. Plan view of the marine basin during the deposition of the Grey Limestone Series, showing the probable maximum extent of the two faunal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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