Mesozoic and Caniozoic Geology and PalcBontology. 13 



overflowed. The Sandstone contains no valuable minerals, and no 

 fossils had then been detected in it. 



In J 853, Isaac Lea* described, from the Triassic of Lehigh county, 

 Pennsylvania, Clepsijsaurus 2)ennsylvanicus. 



In 1854, Dr. Joseph Leidyf described, from the Triassic of Prince 

 Edwaixl Island, Bathyr/nathus borealis. 



In 1855, Prof. J. W. Dawson described Prince Edward Island, 

 which stretches for 125 miles along the northern coast of Nova Scotia 

 and New Brunswick, has everywhere a low, undulating surface, and 

 consists almost entirely of soft red sandstone and arenaceous shale, 

 much resembling the new red of Nova Scotia, and like it having the 

 component particles of the rock united by a calcareous cement. In 

 some places the calcareous matter has been in sufficient abundance 

 to form bands of impure limestone, usually thin and arenaceous. Over 

 the greater part of the island these beds dip at small angles to the 

 northward, with, however, large undulations to the south, which prob- 

 ably cause the same beds to be repeated in the sections on the opposite 

 sides of the island. 



In the same 3'ear, Dr. E. Hitchcock, jr. + described Clatliropteris rec- 

 tiusculus, from the sandstone of Mt. Tom, in Easthampton, Mass., of 

 the age of the lower Jurassic. 



In 185G, Prof. E. Emmonsg described, from the Lower Triassic of the 

 Deep and Dan river beds of North Carolina, Chondrites gracilis, C. 

 interruptus, C. ramosus, Gymnocaulus alternatus, Equisetum column- 

 aroides, Dictaocaulus striatus, liutiodon carolinensis, Clepsysaurus 

 leai, Falaiosanrus carolinensis, P. sulcatas and Posidonia ovalis, now 

 referred to the genus Estheria, and from the Upper Triassic of the 

 Deep and Dan river beds, Stranger ites ohliqims, Acrostichites oblongiis, 

 Pecopteris carolinensis, P. falcata, Pterozamites decussatus, Cyca- 

 dites acutus, C. longifolius, Znmites graminioides, Podozamites 

 lanceolatxis, P. longifolius, Lepacyclotes circularis, L. ellipticusi 

 Walchia diffusa, W. longifolia, C alamites disjimctus, Sphenoglossum 

 quadrifolium, and Posidonia multicostata, and P. triangularis, which 

 are now regarded as svnonyms or varieties only of Estheria ovalis. 



And in 1857|1 he described, from North Carolina, Calamites punc- 

 tatus, Walchia angustifolia, W. variabilis, W. brevifolia, W. gracilis, 

 Sphenopteris egyp)tiaca, Cyclopteris obscura, OdontojJteris tenuifolia, 



* Jour. Acad. Nat. Sci., 2d Ser., vol. ii. 

 t Jour. Acad. Nat. Sci., 2d Ser. vol. ii. 

 X Am. Jour. Sci. and Arts, 2d Ser., vol. xx. 



I N. Carolina Sur. 



II Am. Geo., pt. 6. 



