BUFFALO SOCIETY OF NATURAL SCIENCES 45 



In the south branch the layers of concretions are shown as 

 in the other branch. Half a mile below the Erie bridge there is 

 a fault on the south side of the stream. The hard black layer 

 and the layer of concretions which I have considered the topmost 

 layer of the formation crosses the stream at the bridge and just 

 above it. 



The formation is exposed in a long section in the south 

 branch of Smoke's creek from the dynamite storehouse to Green 

 L,ake. The topmost layer of concretions crosses the stream just 

 below the dam which forms the lake. 



The whole formation is exposed in sections along Cazenovia 

 creek from the middle of a small brook which joins Cazenovia 

 creek a mile south of Spring brook to the Quaker Road bridge. 

 Just above the bridge the creek forks and the topmost layer 

 crosses just above the junction. The layers in the stream bed 

 here show fine plant remains. Plates of Philolepis have been 

 found here by the writer. 



The formation extends in Buffalo Creek from East Elma 

 bridge to Porterville. 



As a whole the Rhinestreet is not rich in fossils, yet some 

 of the layers show a rich and varied fauna. 



Angola Shale. 



The Angola shale is that portion of the Portage beds lying 

 between the black Rhinestreet below and the Hanover shale 

 above. With the overlying Hanover shale it forms the Hatch 

 shale. Originally it was included in the Gardeau. It was 

 named from its exposure along Big Sister creek in the village of 

 Angola, Erie County. 



The formation comprises a series of light gray and fissile 

 dark shales with frequent sandstone layers and concretions. It 

 is 168 feet thick measured along Big Sister creek (Xuther). 

 Some of the lower dark shales are hard and black and resemble 

 those of the Rhinestreet, though they are thinner bedded. 

 Many of the concretions are small, usually not larger than a foot 

 in diameter and frequently flat, but the lower beds contain con- 

 cretions of large size, frequently four feet in diameter, resembling 

 those in the Rhinestreet below. 



