Proceedings of the Yorkshire Geological Society Volume 31 Part 4 December, 1958 Edited by D. H. RAYNER and T. WHITWORTH CONTENTS PAGE 12 C. DOWNIE An Assemblage of Microplankton from the Shineton Shales (Tremadocian) (Issued 10th December, 1958). 331 13 B. G. FORBES Folded Permian Gypsum of Ripon Parks, Yorkshire (Issued 23rd December, 1958) . 351 14 B. J. TAYLOR Cemented Shear-Planes in the Pleistocene Middle Sands of Lancashire and Cheshire (Issued 29th December, 1958) 359 1 g WILFRID EDWARDS The Geological Survey in Yorkshire (Issued 29th December, 1958) ....... 367 16 C. B. CRAMPTON Heavy Minerals in the Magnesian Limestone of Yorkshire (Issued 29th December, 1938) . 383 17 W. W. BLACK The structure of the Burnsall-Cracoe district and its bearing on the origin of the Cracoe Knoll-Reefs (Issued 29th December, 1958) . 39I 18 List of Members of the Yorkshire Geological Society (Issued 29th December, 1958) . .4*5 Printed for the Yorkshire Geological Society by A. BROWN & SONS, LIMITED PERTH STREET WEST, HULL Price 20/- Yorkshire Geological Society COUNCIL Elected 13th December, 19C8 President Prof. K. C. Dunham Vice-Presidents Mr. G. S. Gowing Prof. H. C. Versey Past-President Mr. Wilfrid Edwards Hon. Secretary Mr. G. de Boer, The University, Hull Hon. Secretary to the Publications Committee Dr. Dorothy H. Rayner, Dept. of Geology, The University, Leeds, 2 Hon. Treasurer Dr. A. E. Currall, Dept. of Geology, The University, St. George's Square, Sheffield, 1 Hon. Editors Dr. Dorothy H. Rayner Dr. T. Whitworth, Hatfield College, Durham Hon. Librarian Mr. J. Hartley, Dept. of Geology, The University, Leeds, 2 Other Members Mr. R. W. Clement Mr. E. A. Francis Mr. R. Osborn Mr. J. Dossor Dr. G. A. L. Johnson Mr. J. J. Priestley Dr. C. Downie Mr. P. D. Lamming Dr. A. J. Rowell Mr. N. E. England Mr. J. W. Neale Mr. P. C. Sylvester-Bradley INSTRUCTIONS TO CONTRIBUTORS Members of the Society and others are invited to communicate papers on original subjects of geological interest for publication in the Proceedings. All papers must be read at a meeting of the Society, though, at the discretion of the Council, this reading may be in title only. An author wishing to submit a paper for publication should accordingly write to the Honorary Secretary, and typescripts should be sent to him. The Council is anxious to promote rapid publication, and to this end has printed 'Notes for the guidance of authors' (see Proceedings, vol. 30, No. 7), copies of which may be obtained from the Honorary Secretary (3d. post free). The Council strongly recommends to authors the directions given in the 'Notes' as a means of reducing delays in the acceptance and printing of contributions. Discussion: Members contributing to the discussion of papers read before the Society may submit an abstract of their remarks for publication in the Proceedings. Such contributions should be sent to the Editor immediately after the meeting. PROCEEDINGS OF THE YORKSHIRE GEOLOGICAL SOCIETY VOLUME 31: 1957 to 1958 EDITED BY P. C. SYLVESTER-BRADLEY, D. H. RAYNER AND T. WHITWORTH Printed Jot the Yorkshire Geological Society by A. BROWN & SONS, LIMITED PERTH STREET WEST, HULL DATES OF ISSUE Parts 1 and 2 (Edited by P. C. Sylvester-Bradley) No. 1, pp. 1-38, Pis. 1-2 11th July, 1957 Nos. 2-3, pp. 39-78, PI. 3 15^ July, 1957 No. 4, pp. 79-90 IQth November, 1957 No. 5, pp. 91-148, Pis. 4-5 1th February, 1958 No. 6, pp. 149-156, Pis. 0-7 10th February, 1958 No. 7, pp. 157-210, Pis. 8-12 13^ February, 1958 Parts 3 and 4 (Edited by D. H. Rayner and T. Whitworth) No. 8, pp. 211-218, PI. 13 9th September, 1958 No. 9, pp. 219-226, PL 14 18th September, 1958 No. 10, pp. 227-318, PL 15 28th November, 1958 No. 11, pp. 319-330 1st December, 1958 No. 12, pp. 331-350, Pis. 16-17 20th December, 1958 No. 13, pp. 351-358, PL 18 23rd December, 1958 Nos. 14-18, pp. 359-436, Pis. 19-22 ... 29th December, 1958 Index and Title-Page (Edited by D. H. Rayner and T. Whitworth) No. 19, pp. 437-443, i-vi 13th May, 1959 ii CONTENTS page BLACK, W. W., The Structure of the Burnsall-Cracoe district and its bearing on the origin of the Cracoe Knoll-Reefs .... .... .... 391 CRAMPTON, C. B., Heavy Minerals in the Magnesian Limestone of Yorkshire 383 DE BOER, G., J. W. NEALE and L. F. PENNY, A guide to the geology of the area between Market Weigh ton and the Humber .... .... 157 DOWNIE, C, An Assemblage of Microplankton from the Shineton Shales (Tremadocian) .... .... .... .... .... .... .... 331 EDWARDS, WILFRED, The Geological Survey in Yorkshire .... .... 367 FIRMAN, R. J., The Borrowdale Volcanic Series between Wastwater and Duddon Valley, Cumberland .... .... .... .... .... 39 FORBES, B. G., Folded Permian Gypsum of Ripon Parks, Yorkshire .... 351 FORD, TREVOR D., Pre-Cambrian Fossils from Charnwood Forest .... 211 GEORGE, T. NEVILLE, Lower Carboniferous Palaeogeography of the British Isles 227 MOORE, D., The Yoredale Series of Upper Wensleydale and adjacent parts of north-west Yorkshire .... .... .... 91 MOORE, E. W. J., Dimorphoceratidae from the Upper Visean Shales of County Leitrim, Eire .... .... .... .... .... .... .... 219 NEALE, J. W., see de Boer, Neale and Penny. PENNY, L. F., see de Boer, Noale and Penny. ROWELL, A. J. and J. E. SCANLON, The Namurian of the north-west quarter of the Asrkigg Block .... .... .... .... 1 ROWELL, A. J. and J. E. SCANLON, The relation between the Yoredale Series and the Millstone Grit on the Askrigg Block .... .... 79 SCANLON, J. E., see Rowell and Scanlon. TAYLOR, B. J., Cemented Shear-Planes in the Pleistocene Middle Sands of Lancashire and Cheshire .... .... .... ... .... .... 359 YOUNG, ANTHONY, A record of the rate of erosion on Millstone Grit .... 149 Annual Report for 1956 .... .... ... ... ... .... .. 65 Annual Report for 1957 .... .... .... .... .... .... .... 319 List of members .... ... ... ... ... ... ... ... 415 Index 437 iii LIST OF PLATES Facing page 1. Structure contour map of the north-west quarter of the Askrigg Block 38 2. Namurian of the north-west quarter of the Askrigg Block 38 3. Geological map of the area between Wastwater and the Duddon Valley .... 04 4. Index map to the geology of Upper Wensleydale 148 5. Lithofacies of the Yoredale cyclothems in Upper Wensleydale .... 148 6. Delta in Strines Reservoir 149 7. Section through deposits of delta; and meander in delta .... 150 8. St. Austin's Dale, with the Wolds, the Humber, and north Lincolnshire in the background 157 9. South Cave Station Quarry; and St. Austin's Stone 167 10. Kipling Cotes Quarry and Market Weighton Spillway; and the Risby Park Spillway 193 11. Diagram of the northern face of Elloughton Quarry South 210 12. Geological map of the area between Market Weighton and the Humber 210 13. Charnia and Charniodiscus 212 14. Dimorphoceratidae 226 15. Palaeogeographical map of the British Isles during early Visean times .... 318 10. Microplankton from the Shineton Shales 350 17. Microplankton from the Shineton Shales 350 18. Folded Permian gypsum at Ripon Parks, Yorkshire 358 19. Shear planes and faulting in Pleistocene sands at Whitegate, Cheshire and at Samlesbury, near Preston 360 20. Thin sections of Pleistocene sands showing iron- cemented shear planes 306 21. Geological sketch-map showing some outcrops of Magnesian Limestone in Yorkshire 390 22. Geological map of the south-western part of the Cracoe reef area, Yorkshire 414 iv NEW NAMES The following new names have been proposed in this volume of the Proceedings: (a) PALAEONTOLOGICAL (i) Charnia masoni FORD, 1958, gen. et sp. no v., p. 212. Charniodiscus concentricus FORD, 1958, gen. et sp. nov.,p. 213. (ii) Dimorphoceras (Dimorphoceras) kathleenae leitrimense MOORE, 1958, var. nov., p. 220. Dimorphoceras {Metadimorphoceras) hodsoni MOORE, 1958, subgen. et sp. nov., pp. 222-3. (iii) Hystrichosphaeridium hirsutoides hamatum DOWNIE, 1958, var. nov., p. 335. H. longispinosum uncinatum DOWNIE, 1958, var. nov., p. 337. H. tuberatum DOWNIE, 1958, sp. nov., p. 338. H. cristatum DOWNIE, 1958, sp. nov., p. 338. H. veliferum DOWNIE, 1958, sp. nov., p. 340. Micrhystridium shinetonensis DOWNIE, 1958, sp. nov., p. 342. M. robustum DOWNIE, 1958, sp. nov., p. 344. Veryhachium minutum DOWNIE, 1958, sp. nov., p. 344. Leiosphaeridia fragile DOWNIE, 1958, sp. nov., p. 344 DIORNATOSPHAERIDAE DOWNIE, 1958, fam. nov., p. 345. Diornatosphaera angusta DOWNIE, 1958, gen. et sp. nov., p. 345 (b) STRATIGRAPHICAL (i) Faraday House Sill, ROWELL AND SCANLON, p. 10. Lad Gill Sill, ROWELL AND SCANLON, p. 23. (ii) Worm Crag Group, FIRMAN, pp. 41, 46. Waberthwaite Tuffs, FIRMAN, pp. 41, 48. Duddon Hall Tuffs, FIRMAN, pp. 41, 49. Wallowbarrow Crag Group, FIRMAN, pp. 41, 51. (iii) Thorny Force Sandstone, MOORE, p. 95. V .