BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 30, pp. 423-470 December 31, I9i9 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



SIGmFICAiSrCE OF THE SHEEBUENE SANDSTOIstE IN UPPEE 

 DEAT-QNIC STEATIGEAPHY^ 



BY AMADEUS W. GRABAU 



{Presented before the Paleontological Society December 31, 1917) 



CONTENTS 



Page 



Introduction 423 



The typical Sherburne sandstone 424 



General description 424 



Eastward extension of the horizon of the Sherburne sandstone 426 



Albany County 431 



Southeastern New York 433 



Summaries of faunas 4.33 



The Sherburne horizon west of the Chenango Valley. 436 



The Ithaca fauna 445 



The eastern Ithaca phase 449 



Paleogeographic conclusions drawn from the f aunal distribution 464 



The Ashokan formation or the so-called Sherburne sandstone of the 



Helderbergs .^..,^-^68 . . 



JUNl 1920 



Introduction 



The Sherburne sandstone was named by Vanuxem, in 1839,^ f f oiS afey^g ^^^ 

 town of Sherburne, in Chenango County, N"ew York, where, on and near 

 the Chenango Eiver, it is well exposed and has been extensively quarried 

 for building and flagging purposes. The original description of this 

 formation is very brief and refers to the group of rocks underlying the 

 Ithaca beds of that section and overlying the Hamilton. Yanuxem 

 states that "the stones are of various grades of thickness, alternating 

 with greenish or olive colored shale. Eucoids resembling stems of plants 

 are frequent in this rock and also fragments of plants like the grasses. 

 The flagstone mass extends from Cayuga Lake through the district." 



1 Manuscript received by the Secretary of the Geological Society February 17, 1919. 

 Dedicated to the memory of Charles S. Prosser. 



2 Fourth Annual Report, Third Geological District, New York (Assembly Document 

 no. 275, 1839), p. 318. 



XXX— Bull. Geol. Soc. A.\r., Vol. 30. 1918 (423) 



