24 THE DEVONIAN OF MISSOURI. 



given by Williams is present in the fauna, but this is also true 

 of the overlying Callaway limestone which is supposed to be 

 Hamilton in age. However all of the Mineola species were 

 immigrants or developed from immigrants. If this immigration 

 came in Hamilton time some of the standard list should have 

 come with the others. At least 6 of the standard New York 

 list came into southeastern Missouri in Hamilton time and with 

 an eastern connection assured they should also have come to 

 Central Missouri. The eastward connection must have come 

 in Onondaga time but assuming that to be true there are some 

 remarkable absences. Spirifer acuminatus (Conrad), Spirifer 

 gregarius Clapp, and Siropheodonta concava Hall are some of the 

 characteristic Onondaga species which are not present or have 

 not been found. 



Summary. — 



1. Many species are common to the Onondaga of Indiana 

 and eastward and the Mineola of Missouri. 



2. The dominant species of the Mineola are Onondaga 

 species. 



3. The fauna contains none of the dominant Hamilton 

 species. 



4. Only two of the dominant species of the Mineola are 

 present in other Devonian formations west of the Mississippi 

 River. 



5. The Mineola lies unconformably below the Callaway 

 which is definitely correlated with the Hamilton. 



CALLAWAY LIMESTONE 



Historical. — Keyes 1 first used the term "Callaway lime- 

 stone" but included two formations in his brief description 

 which reads as follows: "In southeastern Missouri, rocks con- 

 taining the typical fauna of the Western Hamilton are sparingly 

 represented in Perry and Cape Girardeau counties, in connec- 

 tion with the limestones above mentioned (Grand Tower Lime- 

 stone). In this region the limestones belonging to this group 

 are dark colored shaly rocks, quite different from the associated 

 strata. 



North of the Ozark uplift the Devonian rocks referred to the 

 Hamilton extend westward along the Missouri River as far as 

 Jefferson City, having their most typical development in Calla- 



»Geol. Surv. Mo., vol IV. 1894. p. 43. 



