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INDEX TO VOLUME XXVII Acanthinula aculeata, 27; lamellata, Barnsley, 60-84; Coal, 58-80; Rock, 27. 62, 64, isopachytes, 69. Accounts, 1946, 126; 1947, 228; Beamshaws Coal, 76. 1948, 308. Beckton, 287. Accrington, 33. Beeston Coal, 73. Acklam, 236. Bempton, 186. Ackworth Rock, 59. Better Bed Coal, 73. Aislaby bore, 180, 195, 204; dome, Beverley, 235. 187. Beyrichocerotoides, 107, 111; trun• Alethopteris, 83; decurrens, 83. cates, 110. Alford, 177. Beyrichoceras castletonense, 106, 107, Alveolites, 106. 123; delicatum, 107, 108, 122; Anhydrite rocks, petrology, 221; micronotum, 107; phillipsi, 107, containing gypsum, 224; relation 108; submicronotum, 106; vesiculi- with dolomite, 220, with halite, ferum, 107, 122. 222. Bibliography, Yorkshire Geology, Anodonta, 26. 1944-1946, with additions to Anthracomya, 84. those of 1939-1943, 36; 1947-1948, Anthraconaia, 82,84,96, 274; adamsi, 298. 97; salteri, 96. Billingham, 205-224. Anthracosia, 82-95; acutella, 85; Bingley, non-marine lamellilbranchs aquilina, 85-89; atra, 84-96; bar• of Millstone Grit, 270. ken, 96; concinna, 85; fulva, 85-92; Black Bed Coal, 73. lateralis, 85-88; nilida, 85; phry- Black Mine Ironstone, 79. giana, 85; planitumida, 85; retro- Blocking Coal, 74-78. tracta, 85; similis, 95. Bobbing, 287. Anthracosphaerium, 82-96; affine, 94, Bolton-le-Sands anticline, 288. 277; gibbosum, 94; propinquum, 93, Bos, 28; longifrons, 23. 95, 277; truemani sp. nov., 93-95. Bothrodendron minutifolium, 83. Anticline, Askern, 59-72; Bolton-le- Brandesburton, 244. Sands, 288; Caistor, 175; Cleve• Bridlington, 235. land, 175, 180, 291; Conder River, Brigg, 179. 288; Don Fault, 59-79, 291; Esk- Brinkhill, 179. dale, 291; Heysham, 288; Lough- Broughton-in-Furness, 285.
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