The Geology of the South Wales Coal-field ...: The country around Cardiff (Sheet 263 of the map), by Aubrey Strahan and T. C. Cantrill. 1902. 2d ed. 1912 |
From inside the book
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Page 1
... district is traversed from east to west by a series of great anticlinal and synclinal folds of pre - Triassic age . The axis along which the movement has been greatest , though the folding is not the most intense , may be termed the ...
... district is traversed from east to west by a series of great anticlinal and synclinal folds of pre - Triassic age . The axis along which the movement has been greatest , though the folding is not the most intense , may be termed the ...
Page 2
... district under description , for there is reason to think that some of the north and south faults must be partly of pre - Triassic age , while some of the faults in the Trias and Lias fall nearly into the direction of the east and west ...
... district under description , for there is reason to think that some of the north and south faults must be partly of pre - Triassic age , while some of the faults in the Trias and Lias fall nearly into the direction of the east and west ...
Page 9
... district also . But little remains to be added to Professor Sollas ' account . In 1893 the cutting for the Rhondda Valley sewer , in the fields east of Rumney Bridge Pottery , exposed grey and white clays with red streaks to 8 or 10 ...
... district also . But little remains to be added to Professor Sollas ' account . In 1893 the cutting for the Rhondda Valley sewer , in the fields east of Rumney Bridge Pottery , exposed grey and white clays with red streaks to 8 or 10 ...
Page 19
... district the east and west disturbances are the older , and this illustra tion of the fact that direction alone is no conclusive test of the age of a fault is instructive . Several small springs break out at or near the base of the New ...
... district the east and west disturbances are the older , and this illustra tion of the fact that direction alone is no conclusive test of the age of a fault is instructive . Several small springs break out at or near the base of the New ...
Page 27
... district ; it rested on red sandstone and grit belonging to the Old Red Sandstone ( Fig . 12 , p . 86 ) . Southwards a continuous descending section of the red sandstones was traversed , all dipping northwards , as far as a point 350 ...
... district ; it rested on red sandstone and grit belonging to the Old Red Sandstone ( Fig . 12 , p . 86 ) . Southwards a continuous descending section of the red sandstones was traversed , all dipping northwards , as far as a point 350 ...
Common terms and phrases
anticline Assoc Avicula contorta bands Barry Island BECHE black shales blue breccia Bristol Cadoxton calcareous carbonate Carboniferous Limestone Cardiff Cardiff Museum Cardiff Nat cliff Coal containing deposits Drift east Ely Valley excavation exposed Fagan's fault feet thick flaggy fossils fragments Geol Geological Survey Glacial gravel green marls grey grit Ibid inches inlier Journ Keuper Marl Lavernock Point Leckwith Lias Liassic lime litoral lower Lower Penarth Ludlow mile mudstones neighbourhood occur Old Red Sandstone oolitic Ordnance Datum Ostrea Ostrea-beds outcrop outlier peat pebbles Pecten Penarth Pentyrch planorbis pre-Triassic probably Proc Quart Radyr red marl Rhætic Rhætic beds Rhætic group Rhymney Rhymney Railway Roath Rumney sand sandy Sheet side Silurian Silurian rocks Somerset South Wales stone Storrie Sully Island surface T. C. CANTRILL Taff thin Trans Trias Triassic Triassic conglomerate tuff upper volcanic water-bed Wenlock Wenvoe yards
Popular passages
Page 127 - FREDERICK M°CoY, FGS One vol., Royal 410. Plates, /i. is. A CATALOGUE OF THE COLLECTION OF CAMBRIAN AND SILURIAN FOSSILS contained in the Geological Museum of the University of Cambridge, by JW SALTER, FGS With a Portrait of PROFESSOR SEDGWICK.
Page 114 - On the Sedimentary Deposits which occupy the western parts of Shropshire and Herefordshire, and are prolonged from NE to SW, through Radnor, Brecknock, and Caennarthenshire, with descriptions of the accompanying rocks of intrusive or igneous characters.
Page iv - Docks, where conclusive evidence was obtained of a subsidence of the land of upwards of 50 feet during and since Neolithic times. In this investigation also Mr. Storrie gave valuable assistance. The Map is issued in two editions. On the edition for Solid Geology the Glacial Drift is omitted, while on the Drift edition the areas occupied by Drift are coloured, as well as those portions of solid geology which are not concealed by the Drift. Manuscript six-inch maps, geologically coloured, are deposited...
Page 116 - On the Characters of the Beds of Clay immediately below the Coal-seams of South Wales, and on the occurrence of Boulders of Coal in the Pennant Grit of that District.
Page 113 - A Geological Essay on the imperfect evidence in support of a Theory of the Earth, deducible either from its general Structure, or from the Changes produced on its Surface by the operation of existing causes.
Page 32 - ... the calcareous rock assumes its usual highly fossiliferous character. That the little vent from which the discharges took place lay to the westward, under what is now the Bristol Channel, may be inferred from the disappearance of the volcanic zone as the ground is traversed in the opposite direction. Fragments of the amygdaloid were found by Mr. SPENCER PERCEVAL at the Tollgate, which show that this rock extends inland for a mile and a half. But immediately to the east over the bare limestone...
Page 128 - Paragenetic formations of carbonate of lime and oxide of iron, and of quartz and oxide of iron, at the Mwyndy iron mines, Glamorganshire (Illustrated) FOSTER.
Page 31 - Weston-super-Mare [E. 3212 (23)], is a finegrained, chocolate-coloured rock, composed of pseuaomorphs after olivine, and probably augite, in a groundmass showing microlitic structure. The phenocrysts are represented by pseudomorphs in carbonate. The microlitic felspars of the groundmass are colourless, but they no longer show their characteristic optical properties. The groundmass is deeply stained with ferric oxide. Although all the minerals have been destroyed, the structure has been perfectly...
Page 129 - A Catalogue of the Cambrian and Silurian Fossils in the Museum of Practical Geology," and "A Catalogue of the Tertiary and Post Tertiary Fossils in the Museum of Practical Geology
Page 125 - Prof. TR On some Bivalved Entomostraca from the Coal-measures of South Wales. Geol. Mag. vol. vii. p. 214. Reprinted in Trans. Cardiff Nat. Soc. vol. ii. p. 112, pi. iii. (610) JOSEPH, T. On the Changing Character of the Coal from Bituminous to Anthracite between Tredegar Iron Works and the Venallt in Glyn-Neath. Proc. S. Wales Inst. Eng. vol. vii. No. 2, p. 137. Discussion in Nos. 4 and 5, pp. 193, 271 (1871), and vol. viii. No. 1, p. 19 (1872). (611) LEE, JE Notice of remarkable Glacial Striae...