DETAILS OF STRATIGRAPHY 363 



about 2 miles northeast of Thebes. This is in the northeast quarter of 

 section 4, township 15 south, range 3 west, where the following section 

 was made: 



Section in abandoned Quarry One-fourth Mile Southeast of Gale 



Feet In. 

 4. Sexton Creek (= Brassfield) limestone : Hard, gray limestone, in 

 layers 4 to 8 inches thick, which are separated one from another 



by 2- to 3-inch chert bands 11 



A break in sedimentation. 

 3. Edgewood formation (Cyrene member) : Single layer of gray, some- 

 what oolitic limestone, containing small pebbles of chert ^4 inch 



to 4 inches in diameter 10 



A break in sedimentation. 

 2. Orchard Creek shale: Bluish-gray calcareous shale bearing 1- to 

 2-inch bands of impure, concretionary limestone 4 to 6 inches 



apart 8 



A break in sedimentation. 



1. Thebes sandstone: Brown, fine-grained, slightly shaly sandstone, at 



the top of which is a hard, deeply iron-stained zone 6 



In the section given above the single layer comprising the third mem- 

 ber represents the total thickness of the Edgewood formation at this place. 

 It probably belongs to a level a little higher than that of the uppermost 

 layer in the preceding section. 



Strata equivalent to those of the Edgewood limestone near Thebes, Illi- 

 nois, are well developed in the vicinity of Edgewood, in Pike County, 

 Missouri. Along the streams 1 to ly^ miles east and northeast of this 

 town the following strata are exposed : 



Section of Strata iy 2 Miles Northeast of Edgewood, Missouri 



2, 3. Edgewood limestone. Feet 

 3. Brown to yellow limestone, with few or no fossils (Bowling Green 



limestone member) 22 



2. Brown limestone, in layers 2 to 6 inches thick, with Schuchertella 

 propmqua and Dalmanites daiiai common in lower part, and 

 Atrypa prcemarginalis, A. putilla, and Dalmanella edgewoodensis 

 abundant in the upper; containing the greater number of the 

 fossils indicated in column number 2 of the table on page 365 



( Cyrene member ) G-l 1 



A break in sedimentation. 

 1. Orchard Creek shale: Bluish-gray shale, with Strophomena nu/osa, 



Isotelus sp., and other fossils. 9 L4 



In a few places in this vicinity the limestone corresponding to number 2 

 in the foregoing section (Cyrene member) is light gray, but usually its 

 color is brown. The upper 1 or 2 feet of this limestone, immediately 



XXV— Bull. Geol. Soc. Am., Vol. 24, 1*012 



