Problematic ichthyosaurs from southwest England: a question of authenticity

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Abstract
Leptopterygius tenuirostris is a long-snouted ichthyosaur which extends from the Upper Triassic (Rhaetian) to the Lower Jurassic (Hettangian and Sinemurian) of England. The species is quite common, but few complete skeletons are known and most of these were collected from the vicinity of Street, in Somerset, during the last century. Some of these skeletons bear a distinctive pattern of chisel marks on their surrounding matrix, and since one such specimen has been shown to be a composite, the authenticity of the others is thrown into question. A survey is made of questionable specimens to alert others to the problem.

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