Session of Tuesday, December 30. 



The Society was called to order at 9.30 a. m., acting President Alexander 

 Winchell in the chair. 



The first paper was — 



VARIATIONS IN THE TERTIARY AND CRETACEOUS STRATA OF ALABAMA. 

 BY DANIEL W. LANGDON, JR. 



It was discussed by W. B. Clark, C. A. White, and the author. The paper 

 is printed among the memoirs of this volume as pages 587-606, plate 23. 



The second paper was entitled — 



THE COMANCHE SERIES OF THE TEXAS-ARKANSAS REGION. 

 BY R. T. HILL. 



The paper was discussed by C. A. White, C. D. Walcott, E. T. Dumble, 

 Cooper Curtice, and the author. It is printed as pages 505-528 of this 

 volume. 



The two following papers were read consecutively and discussed together : 



A GEOLOGICAL SECTION ACROSS THE PIEDMONT PI.ATEAU IN MARYLAND. 



BY CHARLES R. KEYES. 



THE PETROGRAPHY AND STRUCTURE OF THE PIEDMONT PLATEAU IN 



MARYLAND. 



BY GEORGE H. AVIILLIAMS. 



The papers were discussed by W. M. Davis, Jed. Hotchkiss, Charles S. 

 Prosser and G. H. Williams. They are printed as pages 301-322, with 

 plate 12, of this volume. 



A recess was then taken until 1.30 o'clock p. m. 



(613) 



