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Notes upon the small species of Chonetes found in the Lower Carboniferous around Bristol

Published online by Cambridge University Press:  01 May 2009

Stanley Smith
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Extract

Small species of Chonetes are frequently found crowding the limestones in the lower part of the Avonian Succession round Bristol and in the Mendips. Of these Ch. cf. hardrensis (Phill.) is the most persistently abundant throughout its range Km-Zl, but the two other species, Ch.failmulensis sp. nov. and Ch. stoddarti, Vaughan, here mentioned, occur in equally large numbers at particular levels within that horizon. The following notes are the outcome of the study of the material recently collected by Professor S. H. Reynolds, and myself, at St. Monica's Home of Rest, Westbury-on-Trym, but this has been considerably supplemented by specimens obtained from other localities in the district.

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Original Articles
Information
Geological Magazine , Volume 62 , Issue 2 , February 1925 , pp. 85 - 88
Copyright
Copyright © Cambridge University Press 1925

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References

page 86 note 1 This is the most satisfactory name for present use, but it is possible that, a thorough revision of the group may necessitate some restriction of the name. The species requires redefining upon the type, or failing this upon a neotype. The original description by Phillips is inadequate for present-day purposes, and Davidson (Pal. Soc., 1857, p. 186) appears to interpret the species too widely. The syntypes of Orthis hardrensis includes specimens from the Devonian and the Carboniferous. The former is (or are) from the Meadfoot Sands (Lower Devonian) of Berry Pomeroy, S. Devonshire (pl. lx, fig. 104*), and the latter were from [the Lower Culm] Westleigh, N. Devonshire (pi. lviii, fig. 104a), and [the Yoredale Series] Hardraw, Yorkshire (pl. lviii, figs. 104b–c). Phillips named the species after the last-mentioned locality, which, judging from the figures, supplied the more perfect specimens. It seems reasonable to select the Yorkshire form as the lectotype. It is very doubtful, however, whether the original types are now in existence.Google Scholar

page 86 note 2 See note by Mr. Smyth, L. B., GEOL. MAG., Vol. LIX, 1922, p. 23, “On some New Species from the Lower Carboniferous of Ballycastle, co. Antrim,” pp. 21–4, P1. III.Google Scholar

page 87 note 1 Syn. Char. Carb. Limest. Foss. Ireland, 1844, p. 119, pl. xx, fig. 10 (Leptaetia crassistria). Concerning this figure M'Coy remarks (Brit. Pal. Foss., p. 454) “In my original figure there seem, unfortunately, a few ridges too many, and owing to this erroneous crowding, their curious simplicity is not sufficiently apparent.”Google Scholar

page 87 note 2 These remarks are made after examining a specimen from Derbyshire in the Sedgwick Museum, Cambridge, named by M'Coy, but not the type.Google Scholar

page 87 note 3 The type has been placed in the British Museum (B 44901). Paratypes have also been deposited in the British Museum (Ca 7389) and in the Coll. Univ. of Bristol.Google Scholar