32 THE DEVONIAN OF MISSOURI. 



Feet. Inches. 

 Grassy Creeic shale 38 



1. Light gray sandy limestone bearing Spirifer euryteincs Owen, Schizo- 



phoria striatula (Schlotheim), Alrypa reticularis (Linnaeus) and 

 bryozoans in abundance 3 



2. Brown sandy limestone in one prominent bed. Carries numerous 



Chonophyllum ellipticum Hall and Whitfield 9 



3. Brown sandy limestone, very cherty, weathers hackly and forms re- 



entrants. Highly fossiliferous 3 1 



4. Limestone like 3 but bears a great many Chonophyllum ellipticum 



Hall and Whitfield, which make it resistant 2 



5. Like number 4 but not coralline 7 



6. Like number 4 1 3 



7. Like number 5 1 



8. Like number 4 1 (5 



9. Like number 5, but a bed at the bottom contains small black pebbles. 2 3 



Maquoketa shale. 



Beds made up largely of Chonophyllum ellipticum Hall and 

 Whitfield are characteristic of the Callaway in Lincoln County. 



South of New Hope in Sec. 2, T. 50 N., R. 1 E., and in Sec. 

 7, T. 50 N., R. 2 E., patches of Callaway with silicified fossils 

 like those at Shiel in Ralls County outcrop in the road but do 

 not extend more than a quarter of a mile. Two miles north- 

 west of Elsberry, in Sec. 18, T. 51 N., R. 2. E., an outcrop was 

 found but in most places the Devonian is absent. Atrypa 

 reticularis (Linnaeus) and Spirifer euryteines Owen are abundant 

 in this place. 



The Callaway of Ralls, Pike, and Lincoln Counties is patchy 

 and thin and its easternmost extent was near these outcrops. 



Relationships to other Formations. — In western Callaway 

 County the Callaway rests nonconformably on Jefferson City 

 dolomite, and here and there on St. Peter, but in the easternmost 

 five miles it rests in some places on Joachim of the Lower Ordo- 

 vician, in others on Plattin of the Middle Ordovician, and in a 

 few places on Mineola. The westernmost edges of the Plattin, 

 Joachim, and Mineola are in the eastern part of the county. 

 In Montgomery and Warren Counties it is nonconformable on 

 Kimmswick limestone in a few places. In Lincoln County it is 

 disconformable on Maquoketa shales, Kimmswick limestone, 

 and Mineola limestone. 



Though the Callaway rests on four formations ranging in 

 age from Lower Ordovician to Devonian the surface on which 

 it was deposited was a gently undulating plain. The bottom 

 does not vary 200 feet in elevation in Boone, Callaway, Mont- 

 gomery and Warren Counties. This seems the more remarkable 

 on account of the Mineola representing lower Middle Devonian 

 and the Callaway upper Middle Devonian. The Mineola also 

 rested on a nearly level surface. It was probably not firmly 



