182 Tertiary. 



from Bear creek, Frotomeryx halli ; from the Pliocene of Ashley- 

 river, South Carolina, and from the Miocene of New Jersey and 

 Virginia, Manatus antiquus, Phoca debUis ; from the Miocene of 

 Cumberland count}^, Md., Macrophoca atlaniica, now Sqvalodon 

 atlanfAcus, Sphyroina speciosa ; from North Carolina, Orycterocetus 

 cornuti.dens, PUogonodon priscus ; from Salem countj^ New Jerse^y, 

 Chelonia grandceva ; from the Eocene of the Neuse river. North 

 Carolina, Ischyrhiza antiqua ; trom Green river, Missouri, Clupea 

 hiimil is, now Diplomystus humilis ; from the Upper Tertiary of the 

 Bijou Hills, on the Upper Missouri, 3ferychipj)i(s insignis, now 

 Protohippus insignis and Leptarctus jn-imus. 



In 1857, Dr F. V. Hayden* made an estimated vertical section, 

 showing the order of superposition of the different beds of the Bad 

 Lands of White river, in Nebraska, referred to the Miocene, in ascend- 

 ing order as follows: 



Bed A. — Light gra}", calcareous grit, passing down into a stratum 

 composed of an aggregate of rather coarse, granular quartz; underlaid 

 b.y an ash-colored, argillaceous, indurated bed, with a greenish tinge. 

 Titanothermm bed. Best developed at the entrance of the Basin from 

 Bear creek. Seen also in the channel of White river. Thickness, 50 

 feet. 



Bed B, — A reddish, flesh-colored, argillo-calcareous, indurated materi- 

 al, passing down into a gray color, containing concretionary sandstone, 

 sometimes an aggregate of anguhir grains of quartz, underlaid by a 

 flesh-colored, argillo calcareous, indurated stratum, containing a pro- 

 fusion of mammalian and chelonian remains. Turtle and Oreodon 

 bed. . Revealed on both sides of White river and throughout the main 

 body of the Bad Lands. Thickness, 80 feet. 



Bed C. — Lightgra}', siliceous grit, sometimes forming a compact, fine- 

 grained sandstone. Seen on both sides of White river. Also at Ash 

 Grove Spring. Thickness, 20 feet. 



Bed D. — Yellow and light yellow, calcareous marl, with argdlo-cal- 

 careous concretions, and slabs of siliceous limestone, containing well- 

 preserved fresh- water shells. On the south side of White river. Seen 

 in its greatest thickness at Pina's Spring. Thickness, 40 feet. 



Bed E. — Yellowish and flesh colored, indurated argillo-calcareous 

 bed, with tough argillo-calcareous concretions, containing Testudo, 

 Hipparion, Steneoflber, Oreodon and Rhinoceros. Seen along the 

 White river valley, on the south side. Thickness, 30 feet. 



* Proc. Acad. Nat. Sei., vol. ix. 



