No. IX. 



Remarks on the Sandstone and Flmtz Trap Formations of the 

 Western Part of the VaUeij ol the Mississippi. Bij E. P. 

 James, attached to the Exploring Expedition commanded by 

 Major S. H. Long, of the United States Engineers. And 

 bi/the Major communicated to the Society, xcith the permis- 

 sion of the Hon. J. C. Calhoun, Secretary of War. — Read 

 (in conjunction with the preceding Kumber) on the i7th 

 of August, 18S1. 



The district of country contemplated in the following 

 Efsay, lies on the south western margin of that great valley 

 which is watered by tiic Mississippi and its numerous tril»u- 

 taries. We have confined our attention to tliat tract which 

 lies south of the river Platte, and west of a meridian line 

 intersecting the Arkansaw at the confluence of the Ne- 

 gracka. 



Towards the West, our examinations have been termi- 

 nated by the first ranges of the Rocky Mountains ; and by 

 Red River on the south. 



E. r. JAMES. 



Smithland, Kentucky, iZth April, 1821. 



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