Holland : Pleistocene Fauna at Frankstown, Pa. 229 



limestone, the purity of which has caused the product of the quarries 

 to be much sought after by manufacturers of paper. The rock has 

 been extensively faulted, and the fissures, which vary in thickness 

 from a few millimeters to as much as a foot in diameter, have been 

 filled with calcite. The rock is lower Devonian, locally known as 

 Lewistown limestone. The hill, in which the cavern is located, con- 



FlG. I. Diagrammatic section of the cave before its walls were removed in the 

 process of blasting and excavation. A. Open chamber. B. Space filled with earth 

 and stones in which bones were found. C. Fissure closed with rocks. D. Lime- 

 stone strata dipping to the south. E. Soil bearing forest growths. 



tains several small caves, or grortoes, the floors of two of which were 

 explored by Mr. Peterson, but neither of them showed any evidence 

 of extinct animal life. The cave in the limestone quarry was appa- 

 rently originally a cleft or fissure, which, owing to falling in of the 

 upper strata, had gradually become roofed over by large blocks, which 

 had been in part cemented together by stalactitic deposits with which 

 earthy matter washed down from the surface had become mingled. 



