Ch. XXV.] 



APPALACHIAN COAL STEATA. 



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to E, section, %. 505, p. 390), is remarkable for its vast area ; for, ac- 

 cording to Professor H. D. Rogers, it stretches continuously from IST. E. 

 to S. W., for a distance of 720 miles, its greatest width being about 180 

 miles. On a moderate estimate, its supei'iicial area amounts to 63,000 

 square miles. 



This coal formation, before its original limits were reduced by denii- 



