CONTENTS. 427 



II. THE OUTER OR LOWER BARRIER. 



Breaches in this Barrier. 



1. Connecticut River ...................... . ........ .... 364 



Impressions of Fossil Fish .......................... 365 



2. Hudson River ; by a branch of the Housatonick ; 



by the present channel ; by the Clove through 

 which the Ramapaugh yet runs ............. ... ib. 



3. St. Lawrence River, near Quebec ................ 390 



4. Delaware River, below Easton ,. ................ 391 



5+ Schuylkill, below Reading ......................... ib. 



6. Susquehannah, below Swetara .................... 393 



7- Potomac, below Harper's Ferry .................. 395 



Salt water Fossils, left bare ....................... 396 



Fresh water deposites ........................... . ib. 



8. James's River Alluvion ............................ 397 



C. Other Fossil Remains not comprehended within the fore- 

 going limits and descriptions. 



Petrified Ferns and Capillary Plants in Rhode Island ....... 399 



Teeth and Bone of (probably) a Sea-serpent, in North Ca- 



rolina ......................................................... 400 



Oyster-shells and Elephantine Bones, in South Carolina.... 401 



Marine shells and Echini, in Georgia ......................... 402 



The like in Florida ....... ................. ,. ................... 403 



Louisiana ...... . . . ....... . ...... . .................... 404 



Mississippi ...... ... ........... . ...................... 405 



Alabama and Missouri ................ . ........... 406 



Imperfection of this sketch ................................... 407 



Much information wanted within the limits of the Essay... ib. 



Much more for the region beyond them ..................... ib. 



Encouragement to Geologists to collect facts and complete 



the inquiry ................................................. . , .ib. 



Concluding Remarks, on the difficulty of referring the 



events stated, to epochs in chronology ,.,.,,,,.,,.,,, ? . . . jib, 



