220 Tertiary. 



where, especially in localities where, as on the Ottawa, the debris of 

 land-plants and land-shells occur in the marine deposits. 



The Eocene of New Jersey* is known as the Upper marl bed, and 

 has a thickness of 37 feet. Fossils are abundant wherever marl pits 

 have been opened, between Deal on the sea shore and Clementon in 

 Camden county. 



The Miocene is recognized by its fossils in manj^ localities in New 

 Jerse3^ It is not always conformable with the Eocene below, and its 

 thickness is variable. 



In 1868, Prof. E. D, Copef described the Miocene' deposit of the 

 western shore of Maryland, as consisting of a dark, sandy clay, vary- 

 ing from a leaden to a blackish color, through which water does not 

 penetrate. Its upper horizon may be traced along the high shores and 

 clifis of the Chesapeake by the line of trickling springs which follow 

 its upper surface. A great bed of shells occurs at from fourteen to 

 twenty-two feet below its upper horizon. 



He described, Cetophis heteroclitus^ Ixacanthus coelospondylus, Pris- 

 Godelphinus spinosus, now Belosphys spinosus, P. atropius, now B. 

 atropius, P. stevus, now B. stemis, Zarhachis flagellator, Delphin- 

 apterus ruscJienbergeri, now Trefosp)hys ruschenbergeri, D. kicertosus, 

 now T. lacertosus, D. gabbi, now T.gabbi, D. hawkinsi, now T. hawkinsi, 

 D. tyrannus, now Eschrictius tyrannus, E. puslllus, 3Iegaptera 

 expansa, now E. expansus; from the Eocene green sand of Monmouth 

 county, New Jersey, Palceophis halidanus, and P. littoralis. 



Isaac Lea described, from a Miocene deposit, six miles northeast of 

 Camden, New Jersey, Unio alatoides, U. carriosoides, U. humerosoi- 

 des, IT. nasutoides, U. radiatoides, IT. subrotundoides, IT. roanokoides, 

 IT. ligamentinoides, IT. grandioides, and IT. corpulenfoides. 



Dr. Joseph Leidy described, from blue clay and sand beneath a bed 

 of bitumen of Pliocene age, in Hardin count3% Texas, Megalonyx vali- 

 dus.1 Trucifelis fatalis, and Emys petrolei; from Douglas Flat, Calav- 

 eras county, California, Elotherium superbum; from Martinez, Equus 

 pacificus, the largest known fossil horse tooth; from Ashley river, 

 South Carolina, Hoplocetus obesiis; from Gibson county, Indiana, Di- 

 Gotyles nasutu.t, found when digging a well between 30 and 40 feet be- 

 low the surface; from the Miocene of the Bad Lands of White river, 

 Dakota, Leptictis haydeni, Ictops dakotensis ; from Half-moon Bay' 



* Geo. of N. Jersey, 1868. 

 t Proc. Acad. Nat. Sci. 



