Title: On the occurrence of <i>Lingula Credneri</i> , Geinitz, in the Coal-measures of Durham; and on the Claim of the Permian Rocks to be entitled a System
Abstract:T he recurrence of Carboniferous species in Permian strata is not new to palæontologists; for recurrent species from the Carboniferous fauna, and such as were supposed to be recurrent, have been notic...T he recurrence of Carboniferous species in Permian strata is not new to palæontologists; for recurrent species from the Carboniferous fauna, and such as were supposed to be recurrent, have been noticed by several observers. Messrs. Lonsdale, Jones, Howse, King, and Davidson, as well as others, have identified Permian with Carboniferous species, or vice versâ , though it may be remarked that in some cases their determinations have been undoubtedly erroneous. The discovery of another species which had long been thought characteristic of the Permian period, in Carboniferous strata, is therefore not so novel a fact as might appear at first sight. At the same time, I deem it well to record its occurrence, which is not without importance. It is of interest merely as the discovery of another species which is common to the faunæ of the two later palæozoic eras; and it is of consequence as a fact which assists in illustrating some of the physical conditions which prevailed during the deposition of the Upper Coal-measures of the North of England. In the Permian formation, Lingula Credneri is confined to the lower strata. In England it is restricted to the “Marl-slate,” and the lower beds of the “Compact Limestone.” It is not common in these members, having been found only at Ferry Hill, Thrislington, and Thickley. As a Carboniferous shell it only occurred to me during the summer of last year (1858), at the Ryhope Winning, near Sunderland. I first observed it in a thin bed of dark shale, atRead More
Publication Year: 1860
Publication Date: 1860-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 3
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