16 THE DEVONIAN OF MISSOURI. 



"HAMILTON GROUP 



This formation is but sparingly developed in Warren, and is 

 only important as a connecting link between the rocks above 

 and those below. 



A heavy bed of brown limestone at lower part of Sec. 54 

 may belong to this group. (The Hamilton here referred to is the 

 Callaway.) 



LOWER DEVONIAN 



The exact Geological position of the beds below, we are not 

 able to place with certainty. On waters of Massey's Creek we 

 have: 



SECTION 13. 



No. 1. 50 feet chert slope. 



No. 2. 12 feet coarse gray Encrinital Limestone. 



JMo. 3. 10 feet brownish Limestone. 

 Chouteau Beds: 



No. 4. 4 feet fine grained bluish-drab Limestone. 



No. 5. 1-foot brittle, variegated, compact Limestone. 

 Devonian: 



No. 6. Dark-blue Limestone, contains Favosites reticulata. 



No. 7. 6 feet dark, coarse Limestone, contains Spirifer euryteines, .Orlhls tulliensis, 

 and a large Spirifer. 



No. 8. 8 feet coarse, Orinoidal Limestone. 



No. 9. Trenton Limestone. 



On Bear, Massey's, and Lost Creeks, beneath the Hamilton 

 (?) beds as above described, we find about 20 feet, mostly of a 

 coarse gray, and sometimes of a dark-bluish drab Limestone. In 

 the upper part fossils are sometimes quite numerous, belong to 

 the genus Merista and Rhynchonella. At some places a fine 

 close-grained, bluish -drab Limestone occurs near the top, con- 

 taining Favosites reticularia, Alveolites Verneulana, Spirifer, and 

 an Orthis resembling Tulliensis, or Iowensis, near the base. 

 Cyathophyllum rugosum (?) occurs in a brownish Limestone in 

 N. E. part of T. 46, R. 2 W. The Geological pooition of the 

 above described rocks is probably above ? that of the Coralline 

 bed of the Callaway section. The Coralline beds were not seen 

 in this county, but a specimen of Zaphrentis gigantea was found 

 separated from its parent bed. These beds may probably belong 

 near the Onondaga Limestone. 



CRINOIDAL LIMESTONE 



The area occupied by this rock is small; it was recognized 

 at a few localities on Massey's and Lost Creeks, and outcrops on 

 nearly all the bluffs of Bear Creek. It is generally about 11 feet 

 thick, and uniformly a coarse gray Limestone, often crumbly, 



