BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 30, pp. 567-596, PLS. 14-15 DECEMBER 31, 1919 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



COAL MEASUEES OF MAEYLAND ^ 



BY CHABLES K. SWARTZ, W. ARMSTRONG PRICE, AND HARVEY BASSLER 



(Read before the Paleontological Society, Decemher 28, 1918) 



CONTENTS 



Page 



Introduction 567 



Area 567 



Earlier investigation 569 



Present investigation 570 



Part I. Stratigraphy of the Coal Measures, by Charles K. Swartz 570 



In general 570 



Pottsville formation 571 



Character and thickness 571 



Members 571 



Faunas 571 



Allegheny formation 572 



Character and thickness 572 



Members 572 



Conemaugh formation 572 



Character and thickness 572 



Members 573 



Faunas 574 



Monongahela formation 574 



Character and thickness 574 



Members 575 



Table showing geological and geographical distribution of marine 



species 575 



Part II. Correlation of the Coal Measures, by Charles K. Swartz, W. Arm- 

 strong Price, and Harvey Bassler 578 



Method of correlation 578 



Criteria employed 578 



Character of the critical series of the Lower Conemaugh 579 



Faunas 579 



Lithology , 580 



1 Manuscript received by the Secretary of tlie Geological Society August 2, 1919. 

 Published with the permission of the Director of the Maryland Geological Survey. 

 Entered in the Proceedings, this volume, page 154, as "Stratigraphy and correlation 

 of the Coal Measures of Maryland." 



(567) 

 XXXIX— Bull. Gkol. Soc. Am., Vol. 30, 1918 



