522 



CENOZOIC TIME — MAMMALIAN AGE. 



F. Sumter Epoch.— Mollusks — Fig. 823, Pecten 3fortoni Ravenel; Janira 

 hemicyclica Ravenel; fig. 824, A rca hians T. & Hs. ; A. lienosa Say; Galeodia 

 Hodgii Con.; fig. 825, Cyprsea Carolinensis Con. ; C. Pediculus ; Conus adver- 



Figs. 823-825. 



CONCHIFERS — Pig. 



5, Pecten Mortoni ; 824, Area hians. 

 Carolinensis. 



Gasteropod.— Fig. 825, Cyprsea 



sarins Con. ; Fasciolaria distans Lam. ; Busycon Conradi T. & Hs. These South 

 Carolina Pliocene beds contain, according to Tuomey and Holmes, nine species 

 of Echinoderms, while none are found in the Yorktown beds in Virginia. 

 Corals are rare in the beds of both the Sumter and Yorktown epochs. 



G. Fossils of the Loup Rtyer Group, Upper Missouri Region, proba- 

 bly Pliocene. — 1. Mollusks — Land and Fresh-water shells of the genera 

 Helix, Physa, etc. 



2. Vertebrates.— Bones of Turtles, genus Testudo ; of Mammals of the 

 genera, according to Leidy, Megalomeryx, Procamelus, Cervus, Rhinoceros, Mas- 

 todon, Eleplxas, Hipparion, Merychippus, Equus, Castor, Felis, Canis. 



2. FOREIGN TERTIARY. 



I. Rocks : kinds and distribution. 



The rocks of the Tertiary period in Britain and Europe include 

 the following subdivisions, beginning with the oldest (Lyell, Prest- 

 wich', Pictet) : — 



1. Lower Eocene — Britain. — (1.) Thanet sands, containing rolled flints, 

 etc.; (2.) Woolwich beds, clays and sands; (3.) London clay and Bognor beds. 

 Europe. — (1.) In some places in France, flint breccia and conglomerate; (2.) 

 plastic clay and lignite. 



2. Middle Eocene — Britain. — (1.) Bagshot and Bracklesham beds; (2.) 

 Headon Hill sands and Barton clay; (3.) Headon group; (4.) Osborne or St. 

 Helen's group ; (5.) Bembridge or Binstead beds, Isle of Wight. Europe. — Sois- 



