REPORT OP THE STATE PALEONTOLOGIST 1902 



1139 



Whether they were produced by similar causes, it is at preseut 

 impossible to say. Grabau has expressed the opinion that those 

 at Buffalo are probably due to an earthquake shock. Some of 

 the fractures at Union Springs appear to be of recent origin, 

 while those described from Buffalo must have been formed previ- 



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Fig. 3 Dike through Cobleskill limestone, Buffalo cement quarry (after Clarke) 



ous to Oriskany deposition, since they are filled with sand typical 

 of the Oriskany. The dikes in the Cobleskill at Buffalo have 

 been described in detail by both Dr Clarke 1 and Dr Grabau. 2 



The stratum of Salina waterlime that is burned for " hydraulic 

 cement" at Buffalo is slightly more than 5 feet thick. It con- 

 tains a number of species of Eurypterus and a species of Lingula, 

 apparently the same that is associated with the Eurypterus at 

 Union Springs. There are also a number of other species of 

 fossils described from the cement bed. 



The character of the Cobleskill limestone varies considerably 

 in its extent in New York State. In Schoharie county, where 

 corals are so abundant that often they make up a large portion 



1 N. Y. State Mus. Mem. 3. 1900. p.96-98. 

 2 Geol. Soc. Am. Bui. 1900. 11:357-61 



