. Bulletins of American paleontology. MILES KM. M / 5 5 OUR/ ST. CLAIR COUNTr. Text-ligiire 1.—Lociilily map of the three sections described and sampled lor this report. Osceola is located in the center of St. Clair County. HISTORICAL BACKGROUND H. S. Williams (1891, p. 169. 172. 265) introduced the term "Osage Group" as one of three divisions of his Mississippian Series and named it for outcrops along the Osage River in west-central Missouri, al- though no type section was designated (Text-fig. 1). He included the Burlington and Keokuk limestones in the group because he believed fau
. Bulletins of American paleontology. MILES KM. M / 5 5 OUR/ ST. CLAIR COUNTr. Text-ligiire 1.—Lociilily map of the three sections described and sampled lor this report. Osceola is located in the center of St. Clair County. HISTORICAL BACKGROUND H. S. Williams (1891, p. 169. 172. 265) introduced the term "Osage Group" as one of three divisions of his Mississippian Series and named it for outcrops along the Osage River in west-central Missouri, al- though no type section was designated (Text-fig. 1). He included the Burlington and Keokuk limestones in the group because he believed faunas from the two formations were present along the river. Keyes (1893. p. 60) noted, however, that the Keokuk was absent along the entire Osage River and proposed (p. 59) the substitute term "Augusta Limestone" [Group] for the Burlington and Keokuk limestones of southeastern Iowa. He (Keyes, 1895) later emended the definition to include the Warsaw Formation at the top of the Au- gusta. The inadequacies of the type Osage notwith- standing, Weller (1898) and Van Tuyl (1925) promoted use of the term "Osage" because of its priority. The name gained wide acceptance throughout North Amer- ica and has been used as a serial division (Osagean) of the Mississippian Subsystem since the publication of Ulrich (1911), even though its definition conforms more closely to the concept of the Augusta Group than to the time-stratigraphic interval represented in the type area along the Osage River. Witzke ct cil. (1990, p. 15) reintroduced the term Augusta as a lithostrati- graphic grouping for the Burlington-Warsaw interval across Iowa and into Nebraska. Through the years, the concept of the Osagean has been nuKlified in both west-central Missouri and the Mississippi River Valley (Text-fig. 2). Ulrich (1911) lowered the base of the Osagean in the Mississippi River Valley to include the Fern Glen Formation of Weller (1906), and the dolomitic limestone beds orig- inally include
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