130 NEW YORK STATE MUSEUM 



excellent exposure in the east bank of Oatka creek below the 

 bridge at Main street. 



At Lancaster, Erie co. the beds beneath the typical dark lime- 

 stones at Stafford have become highly calcareous, giving a thick- 

 ness of upward of 8 feet of the limestone section, all of these 

 beds carrying a Hamilton fauna with some variations in character 

 for the different beds. This section has been carefully studied 

 bv Elvira Wood, whose succinct account of the fauna and its 

 variations is given at the close of this article. Here the beds, 

 evidently continuous with the heavy limestones at Stafford, are 

 the uppermost of the section (Miss Wood's vii and viii), and it is 

 inferentially probable that at Stafford, which is only a few miles 

 east of Lancaster, the lower part of this series is concealed; at 

 the same time it is quite evident from the other sections cited 

 that the calcifvin°- of the lower beds is a feature of the western 

 extension of this formation. Between Lancaster and Lake Erie, 

 however, but a few incomplete outcrops of the horizon have been 

 recorded. 



FAUNA OF THE STAFFORD LIMESTONE 



From the determinations made by the writer some years ago, 1 

 combined with those given by Miss Wood in the appended 

 paper, we may ascribe the following to the fauna of the Stafford 

 limestone. 



1 Fauna of the Stafford limestone at Stafford, Livonia shaft, Flint 



creek, Lancaster (Miss Wood's upper beds vii and viii) and 



elsewhere 



Fishes 



Undetermined plates and scales 



Worms 

 Spirorbis 



Crustaceans 



Homalonotus dekayi Green 

 Phaeops rana Green 

 Cryphaeus boothi Green 

 C. boothi var. cailiteles Green 



. ' 1 c— . 



x N. Y. state geol. 8th an. rep't p.' 60, 1889. 



