MAMMALIA OF THE PURBECK BEDS. 
329 
with those of other formations more ancient than the Paris 
.gypsum, and, at the same time, it will help him to appreci¬ 
ate the enormous hiatus in the history of fossil mammalia 
which at present occurs between the Eocene and Purbeck 
periods, and between the latter and the Stoneslield Oolite, 
and between this again and the Trias. 
Number and Distribution of all the known Species of Fossil Mammalia from 
Strata older than the Paris Gypsum^ or than the Bembridge Series of the 
Isle of Wight. 
Tertiary. 
Headon Series and beds between) rmT? r v. 
the Paris Gvpsum and the Gies > 14 . ^ 
de Beauchamp.) 
Barton Clay and Sables de Beau-)^ ^ 
champ. ) 
Bagshot Beds, Calcaire Grossier,) (16 French, 
and Upper Soissonnais of Cuisse-20 1 English. 
Lamotte.) ( 3 U. States.* 
London Clay, including the Kysonj^ ^ English 
Plastic Clay and Lignite .... 9 | g 
Sables de Bracheux.1 French. 
Thanet Sands and Lower Landen-) ^ 
ian of Belgium.) 
Secondary. < 
Maestricht Chalk. 
White Chalk. 
Chalk Marl. 
Chloritic Series (Upper Greensand) 
Gault. 
Neocomian (Lower Greensand) 
Wealden. 
Upper Purbeck Oolite .... 
Middle Purbeck Oolite .... 
Lower Purbeck Oolite .... 
Portland Oolite. 
Kimmeridge Clay. 
Coral Rag. 
Oxford Clay. 
Great Oolite. 
Inferior Oolite. 
Lias. 
0 
0 
0 
0 
0 
0 
0 
0 
14 Swanage. 
0 
0 
0 
0 
0 
4 Stonesfield. 
0 
0 
Upper Trias 
Middle Trias 
Lower Trias 
(Wurtemberg. 
4 Somersetshire. 
(N. Carolina. 
0 
(I 
Primary. 
^Permian . . 
Carboniferous 
Devonian 
Silurian . . 
Cambrian 
Laurentian . 
0 
0 
0 
0 
0 
0 
* I allude to several Zeuglodons found iu Alabama, and referred by some zoolo¬ 
gists to three species. 
