BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 23, pp. 447-456 SEPTEMBER 25, 1912 



A MISSISSIPPI AN DELTA ' 



BY E. B. BKANSON 



(Read before the Society Decemher 29, 1911) 



CONTENTS 



Introductoiy 447 



Comparison of Mississippian iu Cloj'ds Mountain and north of Narrows. . 448 



Section of tbe Mississippian iu Cloyds INIouutain 448 



Pulaski sliale 450 



Price sandstone 450 



Section of the Mississippian in the Narrows region 451 



Area of observation a. 451 



Hinton formation 451 



Bluefleld formation 452 



Greenbrier limestone 452 



Pulaski shale 45.'> 



Price sandstone ( Pocono ) 454 



The thinning of the Mississippian away from the Cloyds Mountain area . . . 454 



Interpretation of the conditions 454 



Conclusions 455 



Intkoductory 



During the summers of 1907, 1908, and 1909 tlie writer investigated 

 the geology of parts of Bland, Giles, Pulaski, and Montgomery counties 

 of northern Virginia. Four weeks of 1908 were spent north of Narrows, 

 on Xew Piver, and two Aveeks 12 miles south of Narrows, Avhere the 

 Dublin-Pearisburg road crosses Cloyds Mountain. In the former region 

 most of the Mississippian formations can be studied and in the latter a 

 fine section is exposed. The sections are so strikingly unlike that some 

 time was spent in attempting to account for the differences. The out- 

 crops occur in parallel belts striking northeast-southwest. The dip is 

 generally above 45 degrees, and between the two lines of outcrop all 

 rocks younger than the Devonian have been removed by erosion. As 

 near as can be determined from available data, the regions were about .*)(! 



1 Manuscript roceived by the Secretary of the Society February 20, 1012. 



(447) 



