Maryland Geological Survey 133 



LOCAL SECTIONS OF THE LOWER DEVONIAN ' 

 Sections of Helderberg Formation 

 The sections are given according to their geographic occurrence be- 

 ginning with the southwestern part of the Cumberland area and proceed- 

 ing east to the Hancock area. 



sections of keyser me:mber 



The more important exposures of the Keyser member in Maryland 

 and some few in the adjacent States of West Virginia and Pennsylvania 

 are described in detail. The sections not only include the Keyser mem- 

 ber, but extend into the Coeymans above and the Tonoloway below for 

 a short distance, where these divisions are exposed, in order to show the 

 relation of the Keyser to the overlying and underlying strata. 



Certain definite fossil horizons or some stratum with well-defined 

 lithological characteristics are used as datum planes from which any 

 point in the section can be located by those who may in the futiire be 

 interested in seeing and studying these sections. 



Cumherland Area 

 I. Section at Keyser, West Yirginia 



The Helderberg formation is admirably exposed in the extensive 

 quarries of the Standard Lime and Stone Company situated about ^ mile 

 southeast of Keyser, West Virginia, along the Baltimore and Ohio Rail- 

 road. Two quarries are worked here. The eastern quarry is in the 

 Tonoloway while the western embraces beds extending from the top of the 

 Tonoloway to the base of the Oriskany. Both the upper and lower limits 

 of the Helderberg formation are well shown. This is one of the finest 

 exposures in the region and it is from it that the Keyser member receives 

 its name. 



The lower beds of the Keyser are somewhat shaly, very nodular and 

 of dark blue color. These are succeeded by massive dark blue limestones 



' Contributed by C. K. Swartz, T. Poole Maynard, Chas. Schuchert, and R. B. 

 Rowe. The local sections of the Keyser member of the Helderberg Formation 

 are by Swartz and Maynard. 



