ON THE LIAS BKDS NKAR CHELTENHAM. 



A. Bucklandii (Sow. pi. 130) 

 A. Conybeari (Sow. pi. 131) 

 A.Turneri (Sow. pi. 452) 

 A. Brookii .. (Sow. pi. 190) 

 A. Smithii . . (Ditto.) 

 A. planicostatus (Sow. pi. 406) 



A. elegans . . (Sow. pi. 94) 

 A. Murchisoni (Sow. pi. 550) 

 A. armatus . . (Sow. pi. 95) 

 A. Johnstoni* (Sow, pi. 449) 

 A. communis (Sow.pl. lOJ) 

 A. obtusus .. (Sow. pi. 167) 



The A. elegans and Ac Turneri are nearly always covered 

 with bisulphuret of iron— with iron pyrites only casually, 

 but more frequently with a brownish red coating of peroxide 

 of iron, originating, in all probability, from a decomposition 

 of the pyrites. 



C. A bed of brownish blue tenaceous clay, fifteen feet 

 thick, succeeds, much used in brick-making, in which the first 

 traces of Belemnites minimus are found, which subsequently 

 pervades the whole of the lias and inferior oolite. The 

 Gryphaea incurva^ is also abundant, and the clay nodules of 

 this bed enclose many species of Terehratula. 



D. Next in order occurs a bed of bright blue clay, ex- 

 hibiting a tendency to stratification, and in which two unde- 

 scribed species of Ammonites occur ;t as also the A. Chel- 

 iernensis of Murchison.J (This species is identical with A. 

 Henleyi of Sowerby ; but from many specimens which we 

 have observed in every possible form and state, we are con- 

 vinced that the Ammonite thus named by Sowerby, is only 

 a large state of Murchison's A. Chelternensis.) Inoceramus 

 dubius is also met with here for the first time. 



E. The next is a bed of yellow ochreous lias, containing 



* The Ammonites Johnstoni of Sowerby is merely a flattened state 

 of A. Conybeari, the difference in colour resulting from the former re- 

 taining its beautiful nacre. I have found the A. Conybeari in many 

 intermediate stages. — J. B. 



t To these we have assigned the names of A, Buckmanii and A. Mur- 

 leyii in honour of their respective observers. — Vide " Illustrations of 

 British Fossils," 4to., 1841. — Ed. Geologist, 



X Murchison's Mineral Conchology, fig 172. 



VOL. I. — NO. I. C 



