1995/11/01 by Scott M. Ritter · 1 citation
Earth and Planetary Sciences · Engineering · #Geological Studies and Exploration #Paleontology and Stratigraphy of Fossils #Hydrocarbon exploration and reservoir analysis
paper · doi:10.1017/s0022336000038129
The Upper Missourian to lower Wolfcampian sequence (middle Kansas City through lower Council Grove Groups) of the Midcontinent U.S.A. (Kansas, Oklahoma, Nebraska, and Missouri) is divided into seven biostratigraphic zones defined chiefly upon first occurrences of Streptognathodus species. In ascending order, these are the: 1) Streptognathodus gracilis Zone; 2) Streptognathodus firmus Zone; 3) Streptognathodus pawhuskaensis deflectus Zone; 4) Streptognathodus virgilicus Zone; 5) Streptognathodus brownvillensis Zone; 6) Streptognathodus wabaunsensis s.l. Zone; and 7) Streptognathodus aff. barskovi Zone. The diagnostic Permian genus Sweetognathus first appears in the lower part of the S. aff. S. barskovi Zone. These zones coincide generally with Upper Carboniferous–Lower Permian conodont zones of Russia. Streptognathodus virgilicus , a new species common in the upper Shawnee and Wabaunsee Groups, is described.