Items related to The classification of the Cambrian and Silurian rocks;...
The classification of the Cambrian and Silurian rocks; Being the Sedgwick prize essay for the year 1882 - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ... the Lake District proper. illirldle Bala Series. The upper part of the Borrodale beds belong to this series. In the Pennine Area the volcanic beds are not greatly developed, and they are replaced towards the summit by about 300 feet of black deep-water shales (Dufton Shales, Harkness and Nicholson), with graptolites not yet determined, and other organisms of undoubted Middle Bala age, as: Calymene Blumenbachii Strophomena expansa Trinucleus seticornis Orthis testudinaria Cybele Loveni Trematis corona Illsanus Bowmanni Lingula Ovata Lepta-ma transversalis L. tenuigranulata. L. sericea These shales are succeeded by Coniston Limestone, about 200 feet of limestone bands and calcareous shales, or in places, as at Keisley, of white and pink crystalline limestone. Fossils:--Heliolites interstincta spina. Streptelesma (?) aequisulcatum P. (C.) Eichwaldi Syringophyllum organum Calymene senaria Diplograptus Illaenus Davisii Beyrichia strangulata I. Rosenbergi Harpes Doranni Orthis calligramma Trinucleus seticornis O. flabellulum Cybele Loveni O. insularis Phacops Brongniartii O. vespertilio Phacops (Chasmops) brevi-Trochoceras cornu-arietis. Upper Bala Series. The Ashgill Shales of Sedgwick and Salter succeed the Coniston Limestone, and have la very different fauna. They are never more than 200 feet thick, and consist of a lower stage of grey crystalline limestone, succeeded by poorly cleaved bluish or blackish shales. Fossils:--Caryocystites Davisii Orthis biforata Turrilepas O. protensa Trinucleus concentricus O. vespertilio Staurocephalus clavifrons O. testudinaria Phacops apiculatus Strophomena Siluriana P. eucentra Holopea concinna Cornulites Orthoceras vagans. The species which also occur in the lower stage are marked (). SILURIAN SYSTEM. May Hill Series. Cons...
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