482 



PROCEEDINGS OF BALTIMORE MEETING. 



and its tributaries. On the western shore of the Chesapeake it is less clearly defined, 

 although evidence of the presence of the Terehratula harlani zone* is not wanting.f 

 Its lithological features also are not so sharply marked upon the western as upon 

 the eastern side of Chesapeake bay, the formation as a whole being more arenaceous 

 in Maryland than in New Jersey. 



MANASqUAN FORMATION 



The Manasquan, so far as known, does not extend beyond the limits of New 

 Jersey, where it occurs as a very fine greensand, the high proportion of soluble 

 phosphates making it the most valuable economically of all of the marl deposits. 

 The fauna shows little in common with the preceding formation. 



In southern New Jersey and in the area to the southward, in Delaware and Mary- 

 land, the extensive covering of Tertiary and Quaternary strata renders the dis- 

 covery of the Manasquan formation highly doubtful, if, indeed, it was ever deposited. 



Summary 



Summarizing what has been already said, we find that the Raritan and Matawan 

 formations are most widel}'^ extended, stretching throughout the entire district, 

 while the Navesink, Redbank and Rancocas formations are well developed in Dela- 

 ware and the ' * Eastern shore " of Maryland, and also outcrop in many places to the 

 south of Chesapeake bay. The Manasquan formation, however, has not been 

 found beyond the limits of New Jersey. 



MARGINAL DEVELOPMENT OF THE MIOCENE IN EASTERN NEW JERSEY 

 BY WILLIAM B. CLARK 



The two papers by Professor Clark were discussed by N. H. Darton, 

 H. S. Williams, T. W. Stanton and the author. 



The following paper was read by title : 



CRETACEOUS OF WESTERN TEXAS AND COAHUILA, MEXICO 

 BY E. T. DUMBLE 



This paper is printed as pages 375-388 of this volume. 

 The next paper was entitled — 



SEDIMENTARY GEOLOGY OF THE BALTIMORE REGION 

 BY N. H. DARTON 



Remarks were made by Warren Upham. 



*P. R. Uhler: Trans. Maryland Acad. Sci., vol. 1, p. 97-104. 



t Since the presentation of this paper several specimens of Terehratula harlani from the Severn 

 River region have been secured, while the overlying horizon at the top of the Rancocas formation, 

 and known as the "Yellow limestone" in New Jersey, has been detected. The following char- 

 acteristic fossils have been obtained from it: Goniaster mammillata, Cidaris splendens, Gryphcea 

 bryani and Gryphceaostrea vomer. 



