288 Organic Remains of the 



Art. X. — Supplement to the " Synopsis of the Organic Remains of 

 the Ferruginous Sand Formation of the United States,^^ contained 

 in Vols. XVU and XVIII of this Journal;'^ by S.G. Morton, 

 M. D., he. 



When my attention was first called to this subject, eight years ago, 

 I could not trace the marl region beyond the peninsula of New Jer- 

 sey and a small part of Delaware : subsequently, however, it has 

 been discovered in almost all the Southern States, and I now believe 

 it to be one of the most extensive formations on this continent. 



Its localities in New Jersey, Delaware and Maryland have been 

 so often referred to, that I shall not recur to them ; but for the pur- 

 pose of exciting the observation of tourists, and others, in the South- 

 ern States, it may be well to notice the green sand districts which are 

 already ascertained to exist there. 



JVorth Carolina. — At Ashwood, near Cape Fear river, on the 

 authority of Mr. Vanuxem. 



South Carolina. — At Effingham's Mills, on Lynch's creek, on the 

 authority of Dr. Blanding, who has brought me a number of char- 

 acteristic fossils ; also at Mars's Bluff, on Pedee river, and at Nelson's 

 ferry, on the Santee river. 



Georgia. — Near Sandersville, where it is chiefly recognized by 

 Belemnites. 



Alabama. — My friend Dr. Pitcher, U. S. A., informs me that he 

 has traced the ferruginous sand all the way from Portland to Mont- 

 gomery, a tract which embraces Cahawba, a locality already quoted 

 by me, on the authority of Mr. Nuttall. 



Mississippi. — This State has an extensive marl tract in the Chick- 

 asaw fields, near the borders of Tennessee. The characteristic 

 fossils have been sent to me by my friend Mr. Brewster. 



Tennessee. — The south western portion of Tennessee presents a 

 continuation of the tract just mentioned, which takes a westerly di- 

 rection across the Mississippi river at the Chickasaw Bluffs. 



Louisiana. — Dr. Pitcher, in a recent letter, describes an exten- 

 sive deposit of ferruginous sand between Alexandria and Nachitoches. 

 Judge Bry has also noticed it near the township of Wachita, on the 

 Wachita river, where it is recognized by Belemnites, Ammonites and 

 Gryphaese. 



* See also a letter to the Editor, Vol. XXII, p. 90. 



