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LIMESTONES. 



85 



79 



Westbury-on- Upper 



Galleky. 



Severn, Gloucestershire. 

 The fossils of the white beds were said by the late Pro- Wall " case43 



fessor E. Forbes to indicate an inland brackish sea, like the 

 Caspian. 



111. — Coal measure limestone, commonly called the 



u Fresh 



Botwood, Shropshire. 



Upper Coal Measures. — Le 



a 



112. — Coal measure limestone, commonly called 



Freshwater limesto?ie s" from the upper part of the War- 

 wickshire Coal Measures. — Baxterley, near Atherstone, 

 Warwickshire. 



This limestone is only about two or three feet thick, and 

 runs in a long band near the junction of the Carboniferous 

 and Permian rocks of Warwickshire. Its only fossil seems 

 to be Microconchus Carbonarius. It is probably the equi- 

 valent of 111 and 119. 



Carboniferous limestone, argillaceous lime- 



113. 



stone, from the lower beds of Carboniferous Limestone. 

 Forest of Dean, Gloucestershire. 



114. — Lias limestone, dolomitic ; forming the lowest 

 bed of the Lias. — Pare, two miles north icest of Bridgend, 

 Glamorganshire. 



See " Memoirs of Geological Survey," vol. i., p. 270. 

 115. — Dark grey argillaceous limestone, from the 



upper beds of Carboniferous Limestone. — Henblas, near 

 Holywell, Flintshire. 



When burnt, this limestone furnishes a hydraulic cement, 



and is called " hydraulic limestone/' or, in Welsh, " carreg 

 aberdo." 



116. — Lias limestone. Concretionary argillaceous lime- 

 stone, in a sandy marl, at the base of the Lias. — Westbury- 

 on- Severn, Gloucestershire. 



This specimen, on a weathered surface, shows the concre- 

 tionary structure of the rock. 



117.-rr- Argillaceous limestone, occurring in tabular 



beds in the softer strata of Kimeridae shale, on the coast of 





