Handbook of Paleontology 389 



of the Stafford limestone in the western part of the 

 State, thus making the Cardiff shales, 1 hitherto consid- 

 ered the upper member of the Marcellus formation, a 

 modified Marcellus facies of the Skaneateles formation. 

 Similarly the "Encrinal limestone" of the Cayuga lake 

 section, which is the accepted base for the Moscow 

 shales, corresponds not to the Tichenor limestone, the 

 accepted base of the Moscow shales in western New 

 York, but to the Menteth limestone lentil which is 50 ■ 

 feet above the Tichenor limestone in the Canandaigua 

 lake section. The Tichenor limestone eastward becomes 

 shaly, disappearing in the vicinity of Seneca lake. These 

 facts make a redefinition of the Moscow necessary. The 

 Centerfield limestone lies at the base of the Ludlowville 

 shale. Upon tracing it eastward into the type section 

 of the group at the village of Hamilton, Madison county, 

 it was found that the beds there are of Skaneateles age 

 instead of Ludlowville. The highest Hamilton shales in 

 Schoharie county have been found to carry what is be- 

 lieved to be the Skaneateles fauna, and it is suggested 

 that at least part of the Sherburne sandstone in the 

 Schoharie valley is of Hamilton age and represents the 

 Moscow and at least a portion of the Ludlowville. The 

 westward disappearance of successive faunal zones at 

 the top of the Hamilton indicates unconformable rela- 

 tions between the Hamilton and the Upper Devonian 

 (Cooper '30). Our Hamilton shales in the east (figure 

 52) have not yet been divided; in the southeast, in Ulster 

 county, the lower fossiliferous beds (marine) have been 

 called the Mount Marion beds, the upper, nonfossilifer- 

 ous (nonmarine) beds, the Ashokan formation. It has 

 been suggested (Cooper '30) that the nonmarine Ashokan 

 beds may represent all of the upper Hamilton and the 



See footnotes on pages 390 and 391. 



