CALLAWAY LIMESTONE. 29 



Fourteen miles southwest of the Williamsburg section, the 

 Callaway is only 22 feet thick unless the two lower members 

 should be included with the Callaway instead of with the Mineola. 

 The only basis for calling this Mineola is a bryozoan which 

 seems to be Hemitrypa mineolaensis Branson. The identification 

 is uncertain. 



Section of the Callaway Limestone on Cow Creek. 



S. W. M Sec. 22. T. 47 N., R. 8 W. 



Burlington limestone, brown at bottom. Feet. Inches' 



Sylamore sandstone 1 + 



Snyder Creek shale 50 + 



Callaway limestone. 



Dark-blue, dense fine-grained, hackly limestone. Almost non-fossili- 



ferous. Thickness measured 22 



Practically uniform. The top may be Ave or six feet above the 

 exposed top. 

 Mineola formation. 



Massive sandy limestone, dark drab, a three-foot bed at top 5 5 



Gray to dark-brown sandstone, in massive to thin beds 7 6 



This lies nonconformably on Jefferson City dolomite. 



Exposures in Montgomery County.- — The Callaway is well 

 developed through most of Montgomery County and is lacking 

 in only a few places. In the western part of the county it 

 ranges from 30 to 50 feet thick but gradually thins and becomes 

 patchy towards the eastern part. Descriptions for Callaway 

 County are applicable to Montgomery. In Sec. 31, T. 48 N., 

 R. 5 W., about the middle of the county, Chouteau rests directly 

 on the Callaway and the Callaway appears as follows. 



Thickness. 



Gray granular crinoidal limestone bearing many bryozoans and corals 5' 



Mainly bluish-gray limestone weathering to thin beds; often crossbedded 22' 



Compact dark-bluish-gray limestone bearing Cranaena iowensis (Calvin) in 



abundance at the top 6' 



Gray granular hmestone weathering to brown. About 10 feet from the bottom 

 it bears large numbers of Cyrtina missouriensis (Swallow). Beds more finely 

 granular near the top, highly crinoidal 17' 



Total thickness 50' 



In eastern Montgomery County near the mouth of Whip- 

 poorwill Creek in Sees. 16, 17, 20 and 21, T. 47 N., R. 5 W., 

 Callaway is absent and in most places Sylamore sandstone rests 

 on Plattin limestone, though Mineola is present in patches. 



Exposures in Warren County. — In western Warren County 

 the Callaway is much the same as in Callaway County though it 

 is absent in many places. The following section which occurs 

 on South Bear Creek, in the NW. % Sec. 29, T. 47 N., R. 4 W., 

 is typical. 



