Memoirs of the Geological Survey of Great Britain, and the Museum of Practical Geology in London Volume 2, PT. 1
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1848 edition. Excerpt: ...with their nodular lime-stone, and five or more bone beds, and several layers of shells 40 Shales, with some thin limestone, mostly nodular, and beds of shells, especially Terebratula navicula and some coral bands, chiefly Cyathophylla; shales, with more limestone layers, and abundance of Terebra-tula navicula, &c....... 40 Limestone, nodular and in irregular beds and masses, of the Wenlock type, surmounted by Leptana depressa........ Only a few feet exposed. While traversing every part of the Silurian area which extends from Tite's Point to the parallel of Berkeley (above three miles), we discover only very feeble sections, where the roads and ditches cut below the soil. Along the nearly straight boundary line from Tite's Point to Berkeley, we sometimes observe, as at Middleton House, a conformity of westerly dip of the Silurian and Old Red beds. Near Hayne's farm, where the outline veers round to the east, is a quarry of nodular shales, partly fossiliferous, dipping to the south 25. Again, in the road east of Berkeley, we have a succession of the lower beds of the Old Red Sandstone (red micaceous laminated shales and sandstones), vertical and twisted, or reversed, ranging to the N. andN.E., followed by a considerable breadth of gray, greenish, or reddish thin laminated Silurian shales, ranging N.N.E., and dipping eastward 60 and 70. No fossils were found in this group. On the eastern boundary we have, from Tite's Point to Nubbis Ash, a narrow band of New Red marls, only 100 yards in breadth, beneath lias limestone, inclined to the E. (in one place, near Patch's Wood, not less than 30), and there Mesozoic strata rest against Silurian thin laminated shales, with a few subcalcareous balls. They are seen in vertical position about...
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- 13 Sep 2013
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