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. Willoughby, 174-182; Market Bullcroft, 75. Weighton, 174-187, 291; Melton Burdale, 177. Mowbray, 179; Middleton Tyas, Burton Agnes, 239. 180, 203, 289; Norton-Ridgeway, BURY, C. R. on the chemistry of 59-67; Rossendale, 286; Rother- saline deposits, 205. ham-Kiveton-Manton, 59-72; Buxtonia scarbricula, 102. Towy, 285; Wharfe, 181. Aphlebia, 83. Cadeby, 70. Arianta arbustorum, 27. Caistor, 179; anticline, 175. Avion, 27. Catamites, 83; suckoivi, 83. Asterophyllites equisetiformis, 83. Caninia, 106. Aulina furcata, 110. Carbonicula acutella, 84; affinis, 92; aquilina, 84-87; aquilinoides, 84; Balance sheet, 1946, 127; 1947, 230; atra, 84; concinna, 84; deansi sp. 1948, 310. nov. 275; exigua, 84, 92; fulva, 84; Bargate, 119. fusca, 92; gibbosa, 92; lateralis, 84; BARKER, W. R. (and D. Leitch), on lenicurvata, 274; nitida, 84; phry- fossil plants and non-marine lamel- giana, 84; planitumida, 84; pro- libranchs from the Newhill Mine, pinqua, 93; retrotracta, 84; similis, Wath-on-Dearne, 82. 94; turgida, 92; venusta, 277. 312 PROC. YORKS. GEOL. SOC. XXVII Cardium edule, 27. Coleoptera, 28. Carrock Fell, 285. Columella edentula, 27. CARRUTHERS, R. G. on the secret of Conder River, anticline, 288. the Glacial Drifts, 43, 129. Conisborough, field meeting report, Carychium minimum, 26. 303. Castleford, 75. Coral zones, Castleton district, cor• Castleton, Derbyshire, Lower Car• relation with goniatite zones, 112. boniferous of district, 99; Lime• Cordaites principalis, 83. stone, 105. Cottingham, 239. Catterick, 203. Cow Law, 106-123. Cave Dale, 99-122; lava, 102-120. Coxwold-Gilling trough, 181. Cepaea nemoralis, 27. Craven Fault, 180, 285. Cerebos Salt Co., bores, 218, 220, Cross Newton Quarry, 220. 224. Cross Fell Inlier, 285. Cervus capyeolus, 28; elaphas, 28. Crossness, 287. Chalk, 175-187. Culford, 288. Charnian, 282. Current structures, Sorby's work on, Chee Tor Beds, 102, 117, 120. 7. Chevet Rock, 69. Chilham, 287. Chonetes, relation to Gigantclla, 266; Dalton Rock, 70. papilionacea, 248. Darlington Fault, 170-203. Church Stretton fault, 284. Davidsonina septosa, 101, 103, 107, Clausilia rugosa, 27. 114. Claxby, 179. Daviesiella, relation to Gigantella, Clay Cross marine band, 60. 266. Cleavage, slaty, Sorby's work on, 2. DEAN, V., on an unrecorded over• Cleveland, 174-189; bore, 195-226; flow channel in N.E. Lancashire, dyke, 187-189; anticline, 291. 33. Cliffe, 287. Deer, red, 23, 28, 31. Clowne Coal, 88, 96. Denaby, 74. Coal, Barnsiey, 58-80; Beamshaws, Denshaw, field meeting report, 303. 76; Beeston, 73; Better Bed, 73; Derbyshire Piper Coal, 78. Black Bed, 73; Blocking, 74, 77, Derwent, River, 189. 78; Clowne, 88, 89, 96; Derbyshire Dibunophyllum, 102; bourtonense, Piper, 78; Fenton, 79; First Brown 103, 114. Metal, 77; Flockton, 60, 79; Green Dimorphoceras gilbertsoni, 107. Lane, 78; Haigh Moor, 75; Halifax, Dirt Low, 115; Rake, 103. 73; High Hazels, 76; Meltonfield, Dodworth, 78, 79. 76; 82, Middle Eleven Yards, 77, Dolomite rocks, petrology, 218; with 78; Middleton Little, 77, 78; anhydrite, relations, 220. Middleton Main, 77; New Hards, Doncaster, 65, 75, 79. 77, 78; Old Hards, 75, 78; Park- Don Faults, 59-74; Anticline, 59, 63, gate, 72-79; Second Brown Metal, 291. 75, 77; Shafton, 59, 63, 69; Shef• Don Gorge, field meeting report, 303. field Ganister, 60; Silkstone, 74-79; Driffield, 238. Silkstone Four Foot, 78; Stanley Drift sequences, 45. Main, 76; Swallow Wood, 76; Duckmanton, 88, 96. Swilley, 78; Swinton Pottery, 59; Duddon Estuary, 285. Third Brown Metal, 77; Thorn- DUNHAM, K. C, on a contribution cliffe, 78; Three Bed, 74; Top to the petrology of the Permian Hard, 66; Wakefield Muck, 76; evaporite deposits of N.E. Eng• Warren House, 66; Wathwood, land, 217. 82-97; Wheatley Lime, 77, 78; Dunswell, 239. Whinmoor, 61. Durham, submerged forest beds on Coaley Lane, Wath-on-Dearne, 83. coast, 23; South, field meeting Coal Measures, Yorkshire, varia• report, 305; Southeast, Permian tions in, 58. sequence, 199. Cochlicopa lubrica, 27. Dykes, Neptunean, 113. INDEX VOL. XXVII 313 EAGAK, R. M. C, on non-marine Goniodiocus rotundatus, 27. lamellibranchs from the Millstone Goole, 232. Grit of Bingley, 270. Goosehill Hall, 106, 112, 119. Eakring, 286. Green Lane Coal, 78. Earle's Quarry, Castlcton, 105, 111, Grimsby, 179. 114. Gypsum in anhydrite, 224. Edale Shales, 99, 119, 120, 122. Eden Valley, 285. Hadfield's Quarry, Nun Low, 110. Elk, Irish, 23. Haigh Moor Coal, 75; Rock, 62, Emley, 77. isopachytes, 67. Equisetum, 28. Halifax, 73. Esk River, 187, 189. Halite, relation with dolomite, 222. Eskdale Anticline, 291. Harlech Dome, 285. Evaporites, symposium, 192; pet• Hartlepool, 23. rology of Permian deposits in N.E. Harwich, 288. England, 217; conditions of de• Harworth breccia, 182. position, 223; introduced minerals, Hatfield, 67. 225. Hawes, field meeting report, 304. Hayton bore, 220, 222, 224. Fairydale, 177. Helix nemoralis, 25. Far Cotes, 105, 115, 122. Hemsworth, 65, 80. Faults, Church Stretton, 284; Craven Hesieden Dene, Durham, 29. 180,285; Darlington, 175-203; Don, Heslerton syncline, 177, 184. 59; Humber, 238; Hunmanbv, Hessle, 240. 240; Gilling, 186; Peak, 175, 188; Heysham anticline, 288. Stublick, 289; Upsall, 175; Vale of High Hazels Coal, 76. Pickering, 175, 188. Holaster planus zone, 186. Fenton Coal, 79. Holderness, 177, 231. Field meeting reports, Conisborough HOLLINGWORTH, S. E., on evaporites, and Don Gorge, 303; Denshaw, 192. 303; Hawes, 304; Pateley Bridge, Hoober Hall, 83. 301; Ripon, 301; S. Durham, 305. Horbury Rock, 62, 64, isopachytes, Filey, Fault, 188; structures in 68, 80. glacial silts, 52. Horden, Durham, 29. Filograna permiana, 220. Hornsea, 176. First Brown Metal Coal, 77. Houghton Main Colliery, 83. Flints, 24-28. Howardian Hills, 174, 181, 184, 231. Flixton, 237. Huggate, 176. Flockton, 77; Coal, 60, 79. Hull, 235. Fobbing, 287. Humber, 177, 179, 187; Fault, 238. Forest Beds, submerged, Durham Hunmanby, 238; Fault, 240. Coast, 23. Hydrobia, 26, Gigantetta, 247; relation to Chonetes, Hydrology, E. Riding, 231. Daviesietta, and Productus, 266; crassiventer sp. nov., 257; dentifer Ironstone, Black Mine, 79. sp. nov., 249; varians, 256. Gigantellids, hemisphaericus-like, of Jack Bank, 105, 111. the S. Pennines, Gilling Fault, 186. Kelleythorpe, 240. Girvanella-Bed, 103, 104, 111, 113. Kimberworth, 64. Glacial Drifts, the secret of, 43, 129. Kimmeridge Clay, 177. Goniatite zones, correlation with Kippax, 80. coral zones, Castlcton district, 112. Kirby Grindalythe, 186. Goniatites antiquatus, 107, 108; Kirkleatham bores, 210-222. crenistria, 103-111; dinckleyense, Kiveton, 75, 79. 111; hudsoni, 106-108, 123; maxi- Knapton, 237. mus, 106-108, 123; sphaericos- triatus, 110, 111; spirifer, 112; Lake District, 285. striatus, 111. Lake Windermere, 285. 314 PROC. YORKS. GEOL. bOC. XXVII Lamellibranchs, Newhill Mine, Wath- Millington, 236. on-Dearne, 82; non-marine, Mill• Millstone Grit, Bingley, non-marine stone Grit, Bingley, 270. lamellibranchs, 270. Lauria anglica, 27; cylindracea, 27. Moorlog, 25. Lava, Cave Dale, 102-120. Mytilus edulis, 27. Leavening, 175, 177. Leebotwood Basin, 288. Nafferton, 239. Leeds, 58, 73. NAPIER, E., on the lower anhydrite Leicester, 287. seams of the Tees Area, 210. LETTCH, D., see W. R. Barker. Neptunean dykes, 113. Lepidodendron aculeatum, 83; lycopo- Neuropteris giganteus, 83; helero- diodes, 83; obovatum, 83; simile, 83. phylla, 83; microphylla, 83; rariner- Limax arborum, 27. vis, 83; tenuifolia, 83, Limnaea, 26; palustris, 26; trun- New Hards Coal, 77, 78. catula, 26. Newhill Mine, Wath-on-Dearne, Lincoln, 179, 182, 290. fossil plants and non-marine lamel• Lincolnshire, North, structure, 173; libranchs, 82. Wolds, 174, 177. Newthorn, overflow channel, 33. Linoproduclus, 247. Nomismoceras vittegerum, 107. Lithostrotion, 114; arachnoideum, 102; North