20 



BULIvETIN 12 148 



Spirophyton crasstim was found in the Riverside sandstone along 

 Saw-mill branch south of Borden. 



Cement Quarries. 



The fine-grained calcareous sandstone lying just below the 

 Black shale is quarried for cement at a number of localities in 

 Clark county. These silicious beds are usually from ten to fifteen 

 feet in thickness. The name Sellersburg beds has been given 

 them in this paper from the name of the town near which they 

 are extensively quarried. At the quarry of Speed & Co., near 

 Sellersburg, the rock is a bluish grey fine grained sandstone four 

 feet thick. 



Statioji ipA. — Speed & Co.'s cement quarry, one and one-half 

 miles north of Sellersburg. The species obtained here are: 



Atrypa reticularis c, Chonetes yandellanus a, Orthis sp., Rynch- 

 onella tethys r, Spirifer gramdiferus r, Spirifer segtnentiis c, Spiri- 

 fer varicosus r, Stropheodonta demissa r. 



Station ipB. — Speed & Co.'s cement quarr3^ one and one-half 

 miles north of Sellersburg. 



^ The following species were colledled from the weathered claj^ 

 near the quarry and represent the same fauna as 19 A. 



Athyra vittata a, Atrypa reticularis a, Chonetes yandellarnis a, 

 Crinoid stems c, Loxonema hydrazdicum r, Proetus f r, Spirifer 

 byrnesi r, Spirifer euruteines r, Spirifer granulosus a, Spirifer 

 varicosus r, Stropheodonta demissa c. 



Station igA' . — Limestone quarry one-half mile east of Sellers- 

 burg. 



The rocks exposed at the quarry belong to the Jefferson ville 

 limestone and afforded the following species: 



Atrypa retictdaris r, Chonetes mucro?iatiis r, Favosites enimonsii 

 r, Michelinia favositoidea X , Orthis iowe^isis c, Spirifer acuviinattis 

 c, Spirifer gregarius a, Stropheodonta demissa c, Stropheodonta 

 hcinisph erica c, Stropheodonta perplana r, Strophomena rhom- 

 boidalis a. 



The following secftion is exposed at the cement quarry just west 

 of Watson: 



