476 



SAMUEL WEIDMAN 



of a glacial origin, their occurrence in the bottom of a U-shaped 

 valley and in direct contact with boulder conglomerates, both of 

 which features are usually associated with glaciation, furnish a 

 combination of geologic evidence strongly supporting the evidence 

 of their glacial origin. 



A striated limestone surface occurs along a branch of the Frisco 

 Railroad about five miles east of Sulphur, where it was exposed by 

 the removal of one to two feet of surface formation in constructing 

 the railroad grade several years ago. This locality shows fairly 



Fig. 5. — Polished smooth floor of Conglomerate, Honey Creek valley 



prominent striae and grooves, the more prominent of which are 

 about three-fourths inch in width and about one-fourth inch in 

 depth, some of them having a continuous length of about two feet 

 over the smooth undulating limestone surface. The exposure is a 

 gently sloping land surface of an upland area rather than a valley 

 bottom. 



The striated surface consists of the Arbuckle limestone, and is 

 the floor of a late Pennsylvanian conglomerate that lies in patches 

 in the vicinity, forming a continuous thick body a short distance 

 to the west but thinning out to the east. The grooves have a trend 

 nearly E.-W. and all are approximately parallel to one another. 



