MINEOLA LIMESTONE. 23 



In northeastern Missouri, Ralls County, the fauna is more 

 varied. Spirifer subvaricosus Hall and "Whitfield, Cranaena 

 romingeri (Hall), three species of Stereocrinus, Acervularia 

 davidsoni Edwards and Haime, Favosites alpenensis Winchell, 

 and Ptyctodus calceolus (Newberry and Worthen) are common 

 forms. An unidentified stromatoporoid is abundant in the 

 Ralls County fauna. The corals are restricted to rather definite 

 members of which the most important is the lowest member of 

 the section near Spalding. 



In Central Missouri several species of platyceras - like 

 gastropods are present but they are not abundant. Nucleocrinus 

 verneuili (Troost) was collected from only two localities, both 

 of which are in Montgomery County, the New Florence locality 

 and the Big Springs locality. The specimens came from near 

 the bottom of the formation. 



Correlation.— The fossil content and relationships of the 

 Mineola indicate its correlation with the Onondaga of Illinois, 

 Indiana and eastward. 



The correlation with Onondaga is made mainly on the basis 

 of the aspect of the fauna. Remains of Eunella lincklaeni (Hall), 

 Pentamerella arata (Conrad), and Athyris viitata Hall, constitute 

 the larger part of the fossils in Central Missouri. None of these 

 species has very positive characters for identification purposes 

 and the last two are of little value on account of their range. 

 The species give general character to the fauna. 



Associated with the abundant branchiopods is a large 

 number of species of platyceras -like gastropods, recalling 

 Onondaga faunas. 



Nucleocrinus verneuili (Troost) is rare but it emphasizes 

 the relationship to the Onondaga. 



The number of species of bryozoans makes the fauna distinct 

 from any other in Iowa and Missouri. The only species of value 

 for correlation purposes is Cyclotrypa communis Ulrich, which 

 is from the so-called Hamilton of Buffalo, Iowa, and Rock 

 Island, Illinois. 



The presence of such species as Spirifer uaricosus Hall, 

 Productella spinulicosta Hall, Schizophoria propinqua (Hall), and 

 Stropheodonta inequiradiata Hall indicates Onondaga rather than 

 later time but these species are rare and some of the identifica- 

 tions are uncertaion. 



The absences are almost as significant as the fossils actually 

 present. Not one of the standard list of Hamilton species as 



