AMMONITES— ZOOLOGICAL, ETC. 



281 



Alpes), Cassis, Ciotat and Cadieres (Bouches du Rhone), 

 and the chalks and green sands of the basin of the Py- 

 renees, &c. 



Upper Chalk. The ivhite chalk of Paris and the whole 

 of the Parisian basin, the upper chalks of Tours, Fleche and 

 Vendome, in the basin of the Loire; the chalk of Maestricht, 

 Ciply, &c. This latter series of the cretaceous formation 

 does not appear to contain any Ammonites. 



{To be continued.) 



PROCEEDINGS OP SOCIETIES. 



THE BRITISH ASSOCIATIOX. 

 (Conclusion.) 



Notice on the distinction betiveen the Striated Surface of 

 Rocks and Parallel undulations, dependant on the original 

 structure, by R. I. Murchison, Esq, 



Mr. Murchison called attention to a paper just published 

 and sent to him by the Author, Mr. M'Laren, " On the 

 Striated Rocks of the Corstorphine Hills, near Edinburgh 

 his object, in so doing, being to urge geologists to distin- 

 guish between appearances caused by mechanical action, 

 and those resulting from structure. The existence of abraded 

 surfaces of rocks in these hills was, he stated, pointed 

 out long ago by Sir J. Hall ; but when they were inspected 

 by himself in 1840, in company with Mr. M'Laren and Dr, 

 Buckland, the surfaces which he then saw were marked by 

 sets of many parallel grooves or undulations (precisely 

 similar to the casts sent formerly to the Museum of the 

 Geological Society of London), which appeared to him to 

 belong to a class of phenomena distinct from the striated 

 surfaces, so common around Edinburgh, and in many parts 

 of Scotland. This opinion was confirmed by discovering 



