28 THE DEVONIAN OF MISSOURI. 



the longitude of the Callaway outcrops all strata younger than 

 lower Ordovician have been removed by erosion, excepting the 

 patches referred to in Cole County. 



Section of the Callaway limestone, about 3 miles north of 

 Williamsburg, Callaway County, N. W. |, Sec. 10, T. 48 N., 

 R. 7 W. 



Pennsylvanian shales on Callaway limestone. Feet, inches. 



1. Dark blue limestone, finely crystalline 2 



2. Dense, compact, fine-grained, dark gray limestone. Appears to be made 



up of light gray and dark bluish gray spots on freshly broken sur- 

 faces. Contains Favosites limilaris Rominger in great numbers. May 

 well be called the Favosites limitaris zone 5 11 



3. Variegated red, yellow, blue compact thin-bedded limestone. Weathers 



yellow 2 9 



4. Dense darK-bluish-gray compact limestone bears Diplophyllum callaway- 



ensis Branson and a Stromatoporoid in abundance 3 3 



5. Dense danc-bluish-gray compact limestone bears Diplophyllum callaway- 



ensis Branson in abundance 2 3 



6. DarK bluish-gray compact limestone more coarsely crystalline than No. 7 2 10 



7. Dense darK bluish-gray limestone in beds 4" to 6" thick. About two feet 



from the top a gray crinoidal bed, about 6" thick, that Iooks liKe 



concrete. Fossils rare 13 6 



8. Covered. Seems to be alternating one-inch to four-inch beds of shale 



and limestone, yellow in color 4 



9. Yellow with red streaks, variegated limestone, very hard, compact, 



fine-grained 6 



10. Compact fine-grained bluish-gray nodular-looKing limestone. , Few 



fossils 1 11 



11. Medium gray, coarsely crystalline, crinoidal limestone. Contains numer- 



• ous small, smooth Atrypa reticularis (Linnaeus). The color is some- 

 what darker than No. 15 8 



12. Yellow with darK red streaKS, compact shaly limestone. No fossils ob- 



served 3 



13. Medium gray to dull reddish gray, coarsely crystalline, crinoidal lime- 



stone. No inden tillable fossils observed 10 



14. Yellow with dark red streaks compact shaly limestone. No fossils ob- 



served 3 



15. Medium gray, coarsely crystalline, crinoidal limestone. Numerous iron 



nodules 1 /16 to 1 /4-inch in diameter. No identifiable fossils col- 

 lected 1 7 



Total ." 52 7 



This is the thickest section of Callaway measured by the 

 writer. The measurements are not exact as the rocks are some- 

 what irregular in their bedding and the places of measurement 

 were not good. Several well marked Callaway beds are not 

 present in the section or do not bear the usual fossils. The 

 Acervularia davidsoni member is the best marked absentee. 

 The section was made along a steep wagon road without ex- 

 amination along the strike to discover weathered sections and 

 fossils. 



The Callaway rests on the Plattin near this section. Along 

 the road where the description was made the underlying rock is 

 too much weathered for identification. 



