52 NEW YORK STATE MUSEUM 



are stratigraphically in the position of the beds of western New York 

 (Cashaqua shale) which carry the peculiar Intumescens fauna in 

 its highest development and to the exclusion of the brachiopod fauna 

 of central New York. 



Ithaca flags and sandstone 



Next in succession and at the top of the rock series in this area 

 are blue gray or olive shales, flags and sandstones, the latter some- 

 times being highly calcareous owing to the mass of fossils they 

 contain. 



These rocks constitute the upper portions of the high hills in the 

 southern part of the quadrangle for a thickness of 450 feet and ex- 

 posures of them are hence to be sought in this elevated country. 

 They may be seen in the south branch of the small gully that leads 

 west near the north end of Song lake and also along the highway 

 on the south side of the ravine 3 miles south of Tully and i mile east 

 of the foot of the hill ; also along the road over the hill, 2 miles south- 

 east of Tully. 



The formation contains fossils scattered through thin layers usu- 

 ally separated by masses of barren measures. Species have, in a 

 very noticeable degree, similarity with those of the Ludlowville and 

 Skaneateles shales but toward the upper part of the formation which 

 is not here completely represented, noteworthy diversities are ob- 

 servable. The student of these fossils will do well to compare them 

 first with care with the species from the formations cited which have 

 been described in detail in the volumes of the Palaeontology of New 

 York and then by reference to lists of Ithaca fossils which have been 

 published on different occasions to determine the degree of variation 

 presented by the fossils from the predecessors in the earlier faunas. 

 One may expect to find brachiopods and lamellibranchs specially 

 abundant and more occasionally gastropods, corals and some crin- 

 oids. The species obtainable from these rocks are indicated in lists 

 given in reports of the state geologist for 1894 and 1895, ^^^ spe- 

 cially in that subjoined in the paper immediately following this. 



