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Proceedings 17

Summary of papers

Donovan, S.K. (2012). Which crinoid? Brief thoughts on a field guide. p.1-3.

In introducing the concept of a crinoid in the Societys field guide to Wenlock Edge, the illustration chosen is doubly unfortunate. It is too well preserved to represent the specimens likely to be found by the nascent collector and represents a species that is not yet known from the area. A future guide could more constructively illustrate a species typical of Wenlock Edge, perhaps Crotalocrinites verucosus (Schlotheim).

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Fearnhead, F.E. & Donovan, S.K. (2012). Two Wenlock crinoids, one registration number and a monograph: a tale. p.4-6.

Specimens of two species of flexible crinoid from the Much Wenlock Limestone Formation at Dudley, Lecanocrinus bacchus (Salter) and Icthyocrinus pyriformis (Phillips), in the collections of the Natural History Museum, London, were erroneously given the same registration number by a curator in 1871. This mistake has only just been recognised. Previous confusion caused by this error is indicated by the series of changes to the handwritten entries in the specimen register.

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Donovan, S.K. (2012). Palaeoecology of a solitary coral, Farley, Wenlock Edge, Shropshire (Silurian). p.7-11.

The Much Wenlock Limestone Formation continues to provide new data and insights to geologists and palaeontologists even after being studied for over 200 years. A specimen of the solitary rugose coral Dokophyllum sp. from the old road cutting at Farley, near Much Wenlock, Shropshire, formed part of the fossiliferous debris on a largely overgrown and degraded site. This specimen preserves stark evidence of how it lived and died. After toppling over while still immature, the coral was growing around a tight corner, seeking to elevate the calice above the sediment surface, in which it was partly buried, when it is presumed to have died by burial due to another influx of sediment. Evidence for this scenario includes preservation of the sediment surface (now lithified) in which it was embedded, angling of the new growth away from the old calice so as to leave a wedge-shaped gap between them and growth of root-like rhizoids on the base of the new growth.

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Donovan, S.K. (2012). British Wenlock crinoids at the Western Australian Museum. p.12-16.

A display of Silurian fossil corals, trilobites and crinoids in the Western Australian Museum, Perth, is comprised of specimens from the Much Wenlock Limestone Formation. These formed a part of the collection of James Tennant (1808-1881), a London mineral, fossil and shell dealer. Despite what is stated on the display label, most, if not all, specimens are likely to come from Dudley, not Shropshire. Most of the crinoids are referred to species described by John Phillips in 1839.

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Jenkins, G.T.H. & Holt, T. (2012). A review of the creation of glacial erosional striae and their significance in Shropshire. p.17-21.

Glacial erosional striae are used in conjunction with palaeoglaciological and sedimentological studies to determine former environmental conditions and ice dynamics in regards to the Devensian glaciation of Shropshire. Internal morphological conditions of glacial scour marks have been used to determine eroding mechanisms and particulate trajectories across substrates.

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Butler, S.G., Hotchkiss, K.A. & Rushton, A.W.A. (2012). The “evolution” of the trilobite Strettonia comleyensis. p.22-32.

Strettonia comleyensis is a species of trilobite, discovered and described by Edgar Sterling Cobbold from Comley, Shropshire, of which only the head and an associated pygidium were available for description. Other specimens have since been found in Morocco and Poland, but the genus and species remains fairly rare. In 2009 a non-scientific attempt was made to construct the missing thorax in order to use it on commercial products. This article documents the evolution (ontogeny) of this process and the stages, illustrations and comments involved.

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Warrington, G. (2012). Mineralization in the Triassic rocks of the Cheshire Basin, with particular reference to Alderley Edge, Cheshire, and Clive, Shropshire. p.33-39.

In the Cheshire Basin barite and, locally, a copper-dominated polymetallic mineralization occurs in Triassic fluvial and aeolian deposits. The mineralization is epigenetic and has a complex paragenesis; primary polymetallic minerals have been largely altered to secondary species. Ore body form and disposition was influenced by faults and by host-rock character, with mudstones that formed barriers to fluid migration present in fluvial deposits but not in aeolian deposits.

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To cite an article from this publication:
Fearnhead, F.E. & Donovan, S.K. (2012). Two Wenlock crinoids, one registration number and a monograph: a tale. Proceedings of the Shropshire Geological Society17, 4-6. ISSN 1750-855X (Print), ISSN 1750-8568 (Online) [Online at www.shropshiregeology.org.uk/Proceedings; printed copy in press]

© 2012 Shropshire Geological Society

Proceedings No.17 2012