GEOLOGY OF SOUTHWESTERN IOWA 89 



Chonetes gcinitzianus, Waagen, for Chonetes glabra; Lopho- 

 phyllum distorta, "Worthen, for LophoplniUnm west; Margini- 

 fera teabashensis, Norwood and Pratten, for Marginifera muri- 

 catus; Orthoceras knoxense, McChesney, for Orthoceras rushi nsi 

 as stated by Meek in "Final Report on Nebraska;" Soleniscus 

 paludinaeformis is probably equivalent to Soleniscus intt rcalaris, 

 Meek and Worthen, although this species has a strong fold on 

 the columella which seems to be absent in Meek's description 

 and figure. The substitution of Echinocrinus for Archaeocidaris 

 is a biological misnomer, and the term is not used. There is no 

 marked change in the brachiopod species in the whole series of 

 strata ; Productus pertenuis has not been found below the Noda- 

 way coal or Squamularia perplexa above the Platte shales. The 

 dominant feature of the Stennett limestone is the numerous spe- 

 cies of Archaeocidaris. No limestone in southwestern Iowa has 

 such an abundance of Fusulina. The dominant feature in the 

 lower limestone fauna on the Nodaway is Spirifer cameratus. 



Mr. Hy Clement of MeKissicks Grove conducted the writer 

 to outcrops a stranger would never discover. Studies of the 

 Structural and Economic Geology of this part of Iowa are in 

 progress. 



BIBLIOGRAPHY. 



Geo. H. Girty, Fauna of the Wewoka Formation: Bull. U. S. 

 Geol. Survey, No. 544, 1915. 



Hinds and Greene, Stratigraphy of the Pennsylvania]! of Mis- 

 souri : Missouri Geol. Survey, Vol. 13, 1915. 



Clias. B. Keyes, Synopsis of American Paleozoic echinoids : 

 Proc. Iowa Acad. Science, Vol. 2, 1895. Foundation of exact 

 Geologic Correlation : Proc. Iowa Acad. Science, Vol. 22, 

 1915. 



Samuel Calvin, Geology of Page County: Iowa Geol. Survey, 

 Vol. 11, 1900. 



Pirsson and Schuchert, Text Book of Geology: Intraforma- 

 tional conglomerates. 1915. 



C. D. Walcott, Paleozoic intraformational conglomerates: Geo- 

 logical Society of America. Bull. Vol. 5, 1893. 



