646 PROCEEDINGS OF THE BALTIMORE MEETING 



lications relating to the Cretaceous of Texas this formation was considered as 

 the diminished representative of the Austin chalk of central Texas. Later 

 authors, however, have contended that it represents a higher horizon, and be- 

 longs within the so-called Navarro division of the Upper Cretaceous. 



Recent investigations by the author, in connection with the study of the 

 underground waters of northeastern Texas, tend to confirm the earlier view as 

 advanced by Taff that the Annona is the northeastward extension of the Austin 

 formation. Tracing the outcrop of the Annona westward, it was found to 

 merge with that of the Austin as exposed in the vicinity of Honey Grove and 

 westward to Sherman. At Austin the formation has a reported thickness of 

 about 600 feet, and is composed essentially of chalk throughout. Toward the 

 northeast the lower beds become marly, the thickness of the chalk marl in- 

 creasing until in the vicinity of Red river the marls have a thickness of about 

 400 feet. To this part of the formation, as represented in northeastern Texas 

 and southwestern Arkansas, Hill applied the name Brownstown beds. 



The relations seem to indicate that at the beginning of the Austin epoch the 

 conditions for the formation of pure chalk existed only in the region about 

 Austin, but with the progress of time they were extended farther and farther 

 northeast as a result possibly of a change in the relative position of land and 

 sea. 



The next paper was read by title: 



GEOLOGIC HISTORY OF THE OUACHITA REGION 

 BY E. O. TJLRICH 



After which was read 



RESULTS OF A RECENT INVESTIGATION OF THE COASTAL PLAIN FORMATIONS 

 IN THE AREA BETWEEN MASSACHUSETTS AND NORTH CAROLINA* 



BY WILLIAM BULLOCK CLARK 



[Abstract] 



Contents 



Page 



General characteristics of the formations 647 



Cretaceous 647 



Lower Cretaceous 647 



Upper Cretaceous 647 



Tahle of Cretaceous formations 648 



Tertiary ,♦ 649 



Eocene 649 



Miocene 649 



Pliocene 649 



Tahle of Tertiary formations 650 



Quaternary 650 



Pleistocene 650 



Recent 651 



Comparison of the Atlantic Coast formations with those of the Gulf and other areas 651 



1 Published by permission of the Director of the U. S. Geological Survey. Messrs B. L. 

 Miller, L. W. Stephenson, E. W. Berry, and A. B. Bibbins and Miss J. A. Gardner have 

 been associated with the author in this work. 



Manuscript received by the Secretary of the Society May 26, 1909, 



