ORISKANY FAUNA OF BECRAFT MOUNTAIN 



97 



while the Onondaga limestone beds lie horizontally on them. All 

 these evidences are indicative of an interval of unrepresented time 

 between the deposition of the Manlius limestone and the commencement 

 of Onondaga sedimentation. These evidences are distinctly corroborated 

 by the following accessory phenomena. 



The same quarry shows several nearly vertical fissures which have 

 been filled with white, compact quartz sand. The most clearly developed 

 of the three such fissures here observed is shown in the accompanying 

 plate and diagram. This is an irregular fissure transecting the strata 

 nearly vertically, with horizontal apophyses running out along the sedi- 



t L — r-L-r-^ H^rrb^^- Onondaga limestone 



"bullhead" 



_ — — — t - Top of cement rocl{ 



F'OOT of Cjl/ciTTU 



Diagram showing the largest of the sand dikes (A) in the quarries of the Buffalo cement co. ( at Buffalo N. Y. The 

 floor of the quarry is the lowest layer used for burning cement and while the dike seems to enter this stratum it does 

 not penetrate It. The figure shows the irregular character of the fissure wails, and the lateral apophyses in the lower 

 part which are essentially parallel to the bedding. At the top is a slight displacement of the " bull-head " or Manlius 

 waterllme on one side of the dike. B shows a second dike, the filling of a very narrow fissure. Others are evident 

 elsewhere in this quarry. The Onondaga limestone lies horizontally over them all and is not penetrated by them. 



mentation planes and across them at various angles. It is filled with 

 firmly cemented quartz sand having the aspect and quality of typical 

 Oriskany sandstone. The top of this fissure is in the Oriskauy horizon 

 and the overlying Onondaga limestones are undisturbed. It extends 

 downward across the entire series of waterlimes to and perhaps below 

 the base of the quarry. This disturbance and fracture of the strata, 

 which has possibly been extended by solution and accompanied by a slight 

 displacement on one side, must have taken place after the consolidation of 

 the Manlius limestone and before the deposition of the undisturbed Onon- 



