OKLAHOMA ACADEMY OF SCIENCE 93 



lacks the refractoriness of chert and seemed to be possessed of a 

 measure of toughness that rendered it peculiarly adaptable for use 

 in the form of implements of tillage and for heavy cutting tools, 

 such as hoes, spades, turf cutters, axes, hatchets and celts. That 

 it is softer than the silicious rocks is readily shown by the fact that 

 the cutting edges of the implements of tillage are often found to be 

 worn smooth. Also, implements and ornaments of this material, 

 which are highly polished, are also found. These include celts and 

 hatchets, or tomahawks, and beads, one-fourth to three-fourths of 

 an inch in diameter and roughly sphereical in shape, neatly drilled 

 through for stringing in the form of a necklace. 



Although I was at Webbers Falls or in that vicinity a number 

 of tim.cs subsequently, the stage of water in the river was always 

 such that it was impossible to examine the ledge which I svispectcd 

 t>f being the source of this material so largely resorted to by the 

 ancient implement makers. In October, 1921, I was so fortunate a^ 

 to visit the place where the river was at a low stage and found 

 the ledge exposed for a distance of fully 100 feet from the eastern 

 liark. It proved to be composed of the material that I had suspected 

 !>ut not in the structural form that I had thought a trap dike should 

 be, for it occupied a nearly horizontal position with a slight inclina- 

 tion toward the south bj? southwest. Its surface was channelled, 

 grooved and pocketed by the erosive action of water and sand. It 

 was apparent that, if it really was a trap form.ation, it must have 

 been forced between two strata of sedimentary rock, which seemed 

 scarcely likely. Its lines of cleavage seemed well defined, and in 

 three planes, one horizontal and two vertical, one of the latter inter- 

 secting the other at an angle of approximately forty-five degrees. 

 Inquiry revealed the fact that the formation thus exposed in the 

 river channel extends eastward underneath the site of the neighbor- 

 ing village of Gore and that it had been encountered in the digging 

 of we'ls and cisterns, wliich necessitated drilling and blasting and 

 that, locally, it was known as "lilack granite." 



Shortly after I visited and examined the ledge, a representative 

 of the Oklahoma Geological Survey also visited and investigated it. 

 He succeeded in finding fossils in the formation, thus proving that, 

 instead of being a trap dike, it is in fact a sedimentary rock. Analy- 

 sis reveals the fact that it is an argillaceous limestone, containing 

 a relatively large percentage of silica. In other words, it is a variety 

 oi argillite. Whether it occurs elsewhere in the state and whether 

 this particular stratum outcrops at other points, remains to be 

 learned. 



That the stone aye man actuallv ri. sorted to the ledsje as it 



