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1863: Upper Oolite: Solenhofen. 1844: Carboniferous: Saarbruck, near Treves. 1828: Devonian: Caithness. 1840: Upper Ludlow: Ludlow. 1859: Lower Ludlow: Leintwardine. Obs. The evidence derived from foot-prints, though often to be relied on, is omitted in the above table, as being less exact than that founded on bones and teeth.
Until 1859 there was no example of a fossil fish older than the bone-bed of the Upper Ludlow, but in that year a specimen of Pteraspis was found at Church Hill, near Leintwardine, in Shropshire, by Mr.
Sir R. Murchison therefore classes this Aymestry limestone as holding an intermediate position between the Upper and Lower Ludlow, but Mr. Lightbody remarks that at Mocktrie, near Leintwardine, the Lower Ludlow shales, with their characteristic fossils, occur both above and below a similar limestone.
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