THE SHENANDOAH LIMESTONE 663. 



shales closely resemble the Utica shale, and represent that for- 

 mation. 



In that lithological change from the argillo-calcareous shale,, 

 the arenaceous deposits of the succeeding portion of the Mar- 

 tinsburg formation agree with the transition from the Utica to 

 the Hudson shales of New York. This arenaceous part of the 

 Martinsburg shale the writer would correlate with the Hudson 

 shales of New York as exposed in the lower Mohawk Valley and 

 the Helderberg region. In the revised list proposed by Clarke 

 and Schuchert for the New York series, 1 Lorraine beds is proba- 

 bly the name of the formation with which these shales should 

 be correlated. It is to be noted, however, that the deposits- 

 which have been called the Hudson formation in the Mohawk 

 and Helderberg region do not contain many of the species, or 

 resemble closely in lithological appearance the rocks in the. 

 vicinity of Lorraine, New York. 



Charles S. Prosser. 

 Columbus,- O. 



Science, N. S., Vol. X, 1899, p. 876. 



