IN SECONDARY ROCKS. 



657 



Number and Distrihution of all the known Species of Fossil Mamma- 

 lia from Strata older than the Paris Gypsum^ or than the Bemhridge 

 Series of the Isle of Wight. 



Tertiary. 



Secondary. 



Primary. 



Headon Series and Beds between the"] 

 Paris Gypsum and the Gres de Beau- 

 champ 



Barton Clay and Sables de Beauchamp . . 



10 English. 

 4 French. 



16 French. 



1 English. 

 3 U. States. '-^^ 



All English. 

 7 French. 



2 English. 

 French, t 



Bagshot Beds, Calcaire Grossier, and 

 Upper Soissonnais of Cuisse-Lamotte. 



London Clay, including the Kyson Sand . . 



Plastic Clay and Lignite 



Sables de Bracheux 



Thanet Sands and Lower Landenian of ) 



Belgium [ 



f Maestricht Chalk 



White Chalk 



Chalk Marl. 



Upper Green Sand 



Gault 



Lower Green Sand 



Weald Clay, &c 



Hastings Sand 



Upper Purbeck Oolite 



Middle Purbeck Oolite 14 Eng. (Purbeck). 



Lower Purbeck Oolite 



Portland Oolite 



Kimmeridge Clay 



Coial Rag 



Oxford Clay 



Great Oolite 4 Eng. (Stonesfield). 



Inferior Oolite 



Lias 



Upper Trias 1 



Middle 



Lower 



Permian 



Carboniferous 



Silurian 



Cambrian 



Wirtemberg 

 (Stuttgardt). 



After what lias been said at the close of the 2'7tli chapter, pp. 45*7, 

 459, and at p. 402, ch. xxv., I have little to add in regard to the bear- 

 ing of these discoveries in Purbeck on some geological theories hastily 

 embraced, in favor of the non-existence or scarcity, at particular periods, 

 of certain classes of air-breathing animals, on the ground of our not 

 happening at present to have met with any fossil representatives of the 

 same. It is worthy, however, of notice, that in the Hastings Sands 

 there are certain layers of clay and sandstone in which numerous foot- 

 prints of quadrupeds have been found by Mr. Beetles, and traced by 



* I allude to several Zeuglodons found in Alabama, and referred by some 

 zoologists to three species. 



f The Sables de Bracheux, although somewhat older than the Plastic clay are 

 supposed by Mr. Prestwich to be newer than the Thanet Sands. They have 

 yielded at La Fere the Ardoeyon {Palceocijon) primcevus, the oldest known tertiary 

 mammal. 



42 



