526 Butts — Geologic Section of Blair and 



view of the uncertainty regarding their equivalence the 

 local name is here used. 



The Lowville limestone is regarded as good typical 

 Lowville. Fossils are comparatively scarce but so far as 

 known the fauna is thoroughly in harmony with the litho- 

 logic criteria on which the correlation was originally 

 based. 



The Carlim limestone is new, named from a quarry 

 town on the Petersburg Branch of the Pennsylvania Rail- 

 road a few miles northeast of "Williamsburg, Blair 

 County. 



The Lemont member of the Carlim is named from 

 Lemont, near State College, Center County. 



Both the Carlim and the Lemont member are well dis- 

 played in all the quarries of the region, the part of the 

 Carlim below the Lemont member, with the Lowville 

 overlying the Lemont member, being the main quarry 

 beds of the region, which supplies a large part of the flux 

 rock for the Pittsburgh blast furnaces. The Lemont is 

 not utilized except for road metal or concrete, and con- 

 siderable bodies of it remain in quarries where the flux 

 rock has been taken out. 



The main body of the Carlim is very sparingly fossil- 

 iferous, but the Lemont member is locally richly so. A 

 few of the species are listed in the description of the sec- 

 tion. Maclurites magna has not been found in Blair 

 County but is common at Lemont. The Carlim is of 

 middle Chazyan or middle Stones River age and corre- 

 sponds about to the Lenoir limestone of east Tennessee, 

 the Ridley of central Tennessee, and the Crown Point 

 limestone of the Champlain Valley, in northeastern New 

 York. 



The names of the Canadian formations Bellefonte, 

 Axeman, and Nittany, were introduced by Ulrich in his 

 "Revisions of the Paleozoic Systems' ' in 1911. They 

 were taken from Bellefonte, Center County, and vicinity. 

 The formations in Blair County agree in all respects with 

 the same formations in Center County, except that the 

 Bellefonte and Nittany are each only about half as thick 

 in Blair County as in Center County. There is an 

 exposure of nearly the full thickness of the Bellefonte 

 and Nittany along the river a mile northeast of Williams- 

 burg. 



The divisions of the Ozarkian and their names are all 



