PENNSYLVANIAN-PERMIAN GLA CIA TION 



477 



There are some fresh irregular marks on the rocks apparently made 

 by blunt iron tools during the process of excavating for the railroad 

 grade, but these are quite unlike the grooves thought to be of glacial 

 origin. The grooves thought to be of glacial origin are all essen- 

 tially parallel in position, and many of the larger grooves show fine 

 scratches superposed upon the grooves as though made by stony 

 material having projecting sand grains. 



^ , #f 



r^r 



X 



■4^< 



Fig. 6. — Striated fragment, 5 miles east of Sulphur 



No good photograph of the striated surfaces is available but in 

 a recent visit to the place, there was found in the surface formation 

 that overlies it, the fragment of limestone shown in Figure 6. This 

 loose fragment is striated and grooved on two opposite sides and is 

 apparently only a small portion of a larger fiat piece of limestone 

 that was subjected to abrasion when the overlying conglomerate 

 formation was deposited. 



GROOVED AND FLUTED GRANITES OF THE WICHITA MOUNTAINS 



, In the western part of the Wichita Mountains (see map, Fig. 7) 

 there occur on the lower slopes of the mountains, numerous examples 

 of polished, grooved, and fluted granite surfaces that have a marked 

 resemblance to the work of ice erosion. Up to the present time the 

 best examples have been seen southwest of Hobart, but not unhkely 

 they may later be found to occur to some extent over the entire 

 region. These grooved granites have been observed by other geolo- 

 gists who have visited the region, but they appear to have been 

 referred to in the Kterature only by C. H. Taylor^ who mentions 



^ "Granites of Oklahoma," Okla. Geol. Survey, Bull. 20, Plate XI, 1915. 



