THE PERMIAN SYSTEM IN KANSAS. 7 



ains" as the Flint hills were called by Prof. Broadhead 

 in his <reolo<iical studies of eastern Kansas,* the rocks of 

 the Flint Hills division occupy the summits, a narrow up- 

 per zone of the steep eastern slope, and all of the gentler 

 western slope, extending westward alon<( the south line 

 of the State to the Arkansas river. In the brow of the 

 bluffs of the latter river and its affluent. Walnut creek, at 

 Arkansas City, certain limestones charged with Athyri's 

 subtilita Ha.]], Derbya crassa M. and II. rj- Productus semi- 

 reticulatus Martin, Scptopora biserialis Swallow, Schizodus 

 wheelcri Swallow (r), spines of ArcJuvocidaris, fragments of 

 small crinoid-stems, and other fossils characteristic of the 

 division, being the highest horizons that present a largely 

 brachiopod fauna of Carboniferous afhnities, approximately 

 mark the summit of the division. Stratigraphically, the 

 Flint Hills division includes the true Permo- Carboniferous 

 rocks of Kansas, or more dehnitely, the Neosho and Chase 

 formations of Prof. Prosser's recent paper, "The Classifica- 

 tion of the Upper Palaeozoic rocks of Central Kansas. ":|: 



The Neosho formation consists chiefly of shales, with 

 some limestones which are for the most part of no great 

 thickness, and frequently marly. 



The Chase consists also partly of shales, but is more 

 conspicuous for its massive limestones, which include three 

 flint-bearing limestones, or so-called flints, that have been 

 named, in ascending order, the IFr^/orc?, (May), the Florence 

 (Prosser ), and the Marion (Prosser). 



Prof. Prosser, the most recent authority on the Car- 

 boniferous and Permian paleontology of Kansas, lists from 



*'J'he Carboniferous Rocks of Southeast KansaB. Am. Jour. Sci., 

 Vol. XXI, pp. o.j-fjT: 1881,— and, Carboniferous Rocks of Eastern Kan- 

 sas. Tran. St. Louis Acad., Sci., Vol. IV, Part 3. pp 481-41)2: 1884. 



fDerbya muUistriata M. and H.? 



:|:Charle8 S. Prosser, .Tournal of Geology. Vol. III. No. G, pp. 

 G82-705, and No. 7, pp. 7(i4-80i). See latter No., pp. 7(54-780 and pp. 

 797-800. October November, 1895. 



