570 COAL MEASURES OF MARYLAND 



PRE SEX T IXVES TIG A TIOX 



The senior author began the stud}' in order to rectify simply a few 

 minor details^ but soon became convinced that the problem demanded 

 fundamental investigation. He accordingly invited Dr. AV. A. Price, 

 Jr., and Dr. Harvey Bassler to a-ssist him in the work, and feels very 

 fortunate in enjoying their cooperation. Dr. Price has made a critical 

 study of the marine faunas of the Carboniferous of ^tlaryland and 

 adjoining areas and Dr. Bassler is engaged in the monographic study 

 of the Carboniferous flora of the State. A brief synopsis only of th'3 

 results obtained will be given at this place, awaiting fuller presentation 

 in a forthcoming monograph upon the Carboniferous of Maryland which 

 will be published by the Geolog'ical Survey of Maryland. 



Dr. Price has contributed the study of the faunas upon which the 

 correlations so largely rest. Dr. Bassler has given valuable data for 

 the determination of the Pottsville-AUegheny boundary derived from 

 the study of the flora. Both of these workers have cooperated witli 

 the senior author in the examination and measurement of many sec- 

 tions. The senior author is responsible for the stratigraphic results 

 and the general interpretation of the relations here presented. 



Part I. Steatigraphy of the Coal Measures^ by Charles K. 



SWAETZ 2 

 IX GEXERAL 



It will sufiice for the purposes of this discussion to give simply an 

 annotated columnar section of the Coal Measures of Maryland. Since 

 the most complete section is observed in the Georges Creek basin, the 

 sequence of strata there found will be described, reserving a fuller dis- 

 cussion of the stratigTaphy of the Coal Measures of Maryland for a 

 subsequent publication.^ 



The Coal Measures of Maryland conform to the following divisions : * 



Permian System 

 Dunkard Series. 



Carhou iferous system 

 Pennsylvaniau (Upper Carboniferous) division. 



- The identification of the faunas is by W. Armstrong Price. 



3 The new members of the Coal Measures of Maryland listed in this paper will be 

 described in a report on the Coal Measures of Maryland shortly to be published by the 

 Maryland Geological Survey. 



* All sections are described in descending order. 



