Report of the State Geologist. 267 



is the hia^hest outcrop east of Beaver creek, the aneroid barometer 

 reporting it as 540' above the Unadilla river at Leonardsville, or 370' 

 above the village of Brookfield. The rock is a gray, arenaceous shale, 

 weathering to a brownish color, and is laminated, some of the layers 

 being smooth and of regular thickness, so that it is apparently a good 

 flagging stone. The fossils are rare, only two species being found : 



Stropheodonta perplana^ Conrad. 



Chonetes coronata, Conrad (?). 



No. 499 B. A line of ledges on Beaver hill, south-east of Brookfield. 

 The rock consists of arenaceous shales, in which fossils are not very 

 common, except in a thin layer near the bottom of the exposure. 



Fauna of 499 B. 



Mhynchonella congregata^ Conrad (?). 



Stropheodonta perplana, Conrad. 



Spirifer mucronatus, Conrad. 



Spirlfer gramdifer, Hall. 



Vitulina pustulosa, Hall. 



Terebratida sp. 



Paracyclas lirata, Conrad. 



Pterinea flahellwn, Conrad. 



No. 499 C. Exposure of shales by side of highway, a short distance 

 west of Brookfield. The rocks are fissile, black, argillaceous shales, which 

 upon weathering split up into very small fragments. The shales are 

 quite fossiliferous, containing mostly Lamellibranch shells; but a thin 

 layer contains large numbers of Liorhynclius 'midticosta, Hall. 



Fauna of No. 499 C. 



Liorhynchiis multicosta, Hall. 



Arabocoelia umhonata, Conrad. 



Chonetes coronata^ Conrad. 



Mhynchonella prolijica, Hall (?). 



RhynchoneUa congregata, Con. (?). 



Nuculites ohlongatus, Conrad. 



Nuculites triqueter, Con. (?). 



NiLOida lirata, Con. (?). 



Pleurotomaria, sp. • 



GoniatlteSy sp. 



No. 499 D. Ledges along the banks of a branch of West Creek, 

 near M. Kenyon's farm, one mile west of Brookfield. At the base is a 

 fissile argillaceous shale, which decomposes readily upon exposure to 

 the air and is highly fossiliferous, containing many Lamellibranchs. 

 A short distance farther up the creek, and ten feet higher are arena- 



