384 T. E. SAVAGE ALEXANDRIAN SERIES IN MISSOURI AND ILLINOIS 



below the Bowling Green member, contains a somewhat different fauna 

 in different localities. 



In some places, as southeast of Edgewood, south of Clarksville, and at 

 Louisiana, the upper layer contains many corals, including Calapcecia 

 favositoidea, Clathrodictyon vesiculosum, Favosites subelongus, Lyellia 

 tliebesensis, and Zaphrentis subregularis, together with the form of Platy- 

 strophia described by Foerste as P. daytonensis, Whitfieldella ovoides, 

 and Cyclonema daytonensis. In other places the corals are mostly absent 

 from this layer, and its fauna consists largely of species of Atrypa, Cama- 

 rotcechia ? and Dalmanella. 



A few miles north of Edgewood, between Bowling Green and Watson 

 Station, and still farther north in the vicinity of McCune Station, the 

 Edgewood limestone is represented by 25 to 35 feet by brown, nonfossil- 

 iferous limestone (Bowling Green member), at the base of which is a 

 band iy 2 to 2 feet thick, containing numerous shells of Atrypa prcemar- 

 ginalis, A. putilla, Camarotoechia ? concinna, and Dalmanella edgewood^ 

 ensis. This lower fossiliferous band corresponds to only the upper part 

 of the Cyrene member in the section northeast of Edgewood. 



Deposition of the Bowling Green limestone member is thought to have 

 been initiated by a slight uplift of the region bordering the west side of 

 this basin in Lincoln, Pike, and Kails counties, Missouri, accompanied by 

 a slight subsidence of the area east of the line of uplift. Sedimentation 

 appears generally to have been uninterrupted from the top of the fossilif- 

 erous part of the Edgewood into the Bowling Green member. This move- 

 ment put a stop to oolite deposition, and so quickened erosion of the lan( 

 on the west as to increase the discharge of mechanical sediments into th( 

 basin, the Bowling Green limestone consisting of 15 to 25 per cent oi 

 very fine sand. 



Three to 6 miles west of Mississippi Eiver the limestone, equivalent 

 the upper layers of the Cyrene member near Edgewood, passes with 

 gradual transition into a thin bed of gray oolite which thickens towarc 

 the east, attaining its maximum in the vicinity of Louisiana, Missouri. 

 A variable thickness of brown Bowling Green limestone usually overlies 

 the oolite, being thickest where the oolite is thinnest and thinnest when 

 the oolite is best developed. The oolite bed does not increase in thick- 

 ness at the expense of the lower part of the Bowling Green limestone, but 

 where the oolite is thickest there is represented a greater thickness of th( 

 upper part of the Cyrene limestone member. 



There is given below a section of the strata exposed in the south ban] 

 of Noix Creek, at Louisiana, Missouri, where the oolite bed has its great- 

 est known development : 



