28 



PERMIAN BRECCIAS. 



TJPPEE 



Gallery. 



Table-case 

 in Recess 41 



136. — Parts of stone of ufi>er Silurian fossilliferous 



limestone, from the outlier of Church Hill, Bay ton. Both 

 of these were probably originally transported from the 

 Wenlock Edge country. 



o illustrate the difference between watericorn stones in con- 

 glomerates and angular aqueous breccias. 



140 and 141. — Permian conglomerate, and stones from 



Qglomerate ; Four Ashes, near En 

 142, — Ditto, Galacre Hall, nea 



En 



This con- 



glomerate lies below the Permian brecciated conglomerate 

 and is separated from it by beds of red marl and sandstone. 

 Almost all the pebbles in it are well waterworn and rounded, 

 and they are invariably small. They are included in this 

 collection for the purpose of contrasting them with the 



angular stones of the breccia. 



The true conglomerate is so 



calcareous that it has sometimes been burned for lime. Un- 

 like those in the breccia, the limestone pebbles have gene- 

 rally been derived from the carboniferous limestone, and 

 stems of the encrinites of that formation stand in relief on 

 the weathered surfaces of the pebbles. 



143. — Calcareous ordinary conglomerate, from the Per- 

 mian rocks, near Bedworih, Wancickshire ; like 140 to 142. 



144. — Pebbles from the conglomerate of the neiv red sand* 

 stone (Bunter). These are also placed in the case to contrast 



with the 



angular 



stones No. 100 to 128. 'No scratches 



appear on them, but they are exceedingly waterworn, and 

 have been smoothed like the pebbles of the Chesil bank, 

 or any similar beach, by breakers or some such movement 



" Its component stones 



rattling them against each other. 



are often from three to nine inches in diameter, but 

 unlike those in the breccias, they are all beautifully 

 rounded, and where they touch in the rock they are not 

 scratched, but indent each other at the points of contact; 









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