7 16 CHARLES S. PROSSER 



owed by a subsidence of the sea bottom before the deposition 

 of the succeeding even thin bedded limestones. This change of 

 physical condition is indicated in the fauna by the nearly com- 

 plete disappearance of the brachiopods and the survival of a 

 fauna composed mainly of Permian lamellibranchs. This for- 

 mation constitutes the upper division of the Chase stage, and in 

 the preliminary description of these rocks it was called the 

 "Marion flint and concretionary limestone" 1 from the outcrops 

 below Marion, and regarded as a subformation. The overlying 

 buff limestone and shales, however, were named the Marion 

 formation and hence to avoid confusion the name Marion was 

 dropped for the lower division and it was renamed the Winfield 

 concretionary limestone from the outcrops in the vicinity of 

 Winfield, Cowley county, in southern Kansas. 2 Fourteen months 

 later Dr. Keyes published the name "Winfield limestone," which 

 he applied to a Cambrian formation found in the Mississippi val- 

 ley near Winfield, Lincoln county, Missouri. 3 In 1900 Professor 

 Harris and Mr. Veatch applied the very similar name of Winn- 

 field limestone (spelled Winn) to a Cretaceous formation of 

 northern Louisiana. 4 Clearly the Kansas usage of the name has 

 priority, and Winfield is adopted as the name of this formation. 



SUMNER STAGE. 



The two upper formations of the Big Blue series (the Marion 

 and Wellington shales) were classed together by Professor Cra- 

 gin to form the Sumner division. 5 It was named after Sumner 

 county in southern Kansas which includes nearly the entire 

 breadth of its outcrop in that part of the state. This name is 

 retained for this division, which is considered to have the rank 

 of a stage. 



Marion formation. — Buff thin-bedded limestones and shales 

 form the principal part of this formation which is the latest 

 Paleozoic one found on the Cottonwood Falls quadrangle. The 



1 Jour. Geoi.., Vol. Ill, 1895, p. 77 2 - 



2 Univ. Geol.Surv. Kan., Vol. II, Feb. 15, 1897, p. 64. 

 1 Proc. Iowa Acad. Set., Vol. V, April 28, 1898, p. 60. 

 "•Geol. Surv.La., Report for 1899, Sec. II, p. 56. 



s Col. Coll. Studies, Vol. VI, pp. 3, 9, 48. 



