﻿Introduction. 



The discovery of a fauna, rich in species and individuals, in the 

 Calciferous formation of the Mohawk Valley of New York, near 

 the village of Ft. Hunter,* led to the publication of a paper 

 describing the fauna and new species of this section. The present 

 paper is the result of a few weeks' work in the Mohawk Valley, 

 during which the writer endeavored to trace the distribution of 

 the fauna and to obtain a more complete faunal list. The writer 

 takes this opportunity to thank Prof. G. D. Harris for his 

 kindness in figuring the fossils described in this paper. 



Sections. 



Ft. Hunter-Tribes Hill Section. T^w-w* k^; ^ oS*<t& 



- 

 Collections were first made from all the exposures of the strip 

 of the Calciferous formation shown on the map (PI. 2). The con- 

 tacts between the Calciferous, Trenton and Utica formations were 

 carefully traced and mapped by Mr. W. M. Cooper and the writer. 

 This strip begins about a quarter of a mile south of the Mohawk 

 River and east of the village of Ft. Hunter, where it is about a mile 

 wide, and extends about three miles north, the width varying from 

 about one mile to one-fifth of a mile. The Calciferous forma- 

 tion is brought to the surface on the east by a fault, which can 

 be traced by an almost continuous escarpment from the river to 

 the most northern point shown on the map. It undoubtedly ex- 

 tends further north, but the country is so covered with drift that 

 the rock is hidden. The Calciferous and Utica formations are 

 exposed together in but one place on the fault line, in the bed of 

 the creek which parallels the "Lutheran church road" near 

 Clark's quarry. In this place the formations are within a few 

 feet of each other, the Utica shale being tilted up at a high angle. 

 The Calciferous formation of this region is overlaid, in some 

 places, by a thin bed of Birdseye (Lowville) limestone, in others 



* American Paleontology, Vol. 3, Bull. 13, Oct. 1900. 



