84 



CHALMER L. COOPER 



more strongly curved septa of Pennsylvania n 

 species. 



3. The eccentricity of coiling, particularly in ear- 

 lier volutions. 



4. The modified hour-glass shape as visible in 

 axial sections and the variation in degree of 

 concavity of the two sides. 



5. The endothyroid juvenarium of some species. 



Based upon differences of size of prolocu- 

 lum, height of volutions, form ratio, and 

 septal count, three new species are recog- 

 nized in the Kinkaid fauna, namely M. 

 chesterensis (pi. 19, figs. 1-5), M. zelleri (pi. 

 19, figs. 6-8) and M. kinkaidensis (pi. 19, 

 figs. 9, 11). In general the Chester species 

 are intermediate in form between the two 

 extremes from the Pennsylvanian, namely, 

 M. marblensis and M. adrena (see sagittal 

 sections), having thicker shells than the 

 former and lacking the inflated umbilical 

 area of the latter. While the number of 

 chambers per volution are about the same, 

 the shorter, thicker septa of the Mississip- 

 pian forms result in proportionally smaller 

 chambers. 



Millerella (species undescribed) from the 

 Pitkin (upper Chester) of Arkansas has been 

 reported by Henbest (1946). Representa- 

 tives of the genus are also known to occur 

 with Chester species of Archimedes and 

 trilobites in beds of the Amsden formation 

 in Wyoming (Zellef, 1946, personal com- 

 munication). 



In addition to the fusulines several genera 

 of smaller Foraminifera are present in the 

 Kinkaid microfauna (pi. 20, figs. 23-26). 

 There are two new species of Endothyra, one 

 of which, E. acuta, is suggestive of E. 

 whitesidei Galloway and Ryniker, known 

 heretofore from the Atoka of Oklahoma and 

 the Marble Falls of Texas. The other is 

 similar to E. media Waters, E. rothrocki 

 Harlton and E. distenta H. J. Plummer, from 

 horizons in Oklahoma and Texas well above 

 the Morrow zone and considerably younger 

 than the Kinkaid. The flattened cylindrical 

 forms with the irregularly spaced constric- 

 tions marking successive chambers closely 

 resemble those from the Johns Valley shale 

 of Oklahoma described as Hyperammina 

 elongata clavatula Howchin by Harlton 

 (1933, p. 8). A species of Palaeutextularia is 

 not like the Johns Valley species. The ex- 

 tremely irregularly coiled Trepeilopsis is 



abundant and shows the variable nature of 

 these forms. This genus is known to occur as 

 low as the Chouteau (or Rockford), al- 

 though described species are restricted to 

 the Pennsylvanian. Significant is the ab- 

 sence of such characteristically Pennsyl- 

 vanian genera as Polytaxis, Tetrataxis, 

 Endothyranella, and Reophax. 



Chester and Morrow conodont literature 

 consists of only one paper for each of these 

 subdivisions (Branson and Mehl, 1940 and 

 Harlton, 1933). The conodonts in the Kin- 

 kaid are strongly Mississippian in character 

 containing none of the typically Penn- 

 sylvanian forms described by Harlton from 

 the Johns Valley. The two species of 

 Prioniodus, P. scitulus and P. varians, are 

 not known from beds younger than Chester. 

 A common Pennsylvanian genus, Cavus- 

 gnathus, is represented by C. cristata which 

 is easily distinguished from younger species. 

 The specimens of Hindeodella, while not 

 identifiable specifically, possess denticu- 

 lated bars similar to those described from 

 the Caney shale. A species of Taphrognathus, 

 not known heretofore above the Keokuk, 

 gives a distinct Mississippian aspect to the 

 Kinkaid fauna. 



The ostracodes are of the greatest value 

 for determining the age of this fauna. The 

 literature contains two fairly complete 

 papers describing Kinkaid ostracodes 

 (Croneis and Thurman, 1938 and Cooper, 

 1942) and several additional papers describe 

 other Chester faunas. Information on Lower 

 Pennsylvanian ostracodes is contained 

 largely in papers by Roth (1929) and 

 Harlton (1929, 1933). 



Plate 21 shows such typical upper Chester 

 species as Balantoides reticulatus Croneis 

 and Thurman (figs. 1-3), the three species of 

 Bairdia, B. golcondensis Croneis and Gale 

 (figs. 25, 26), B. attenuata (figs. 27, 28), and 

 B. impendere Cooper (figs. 29, 30), Bey- 

 richiopsis thori Coryell and Johnson (fig. 

 13), and the two species of Ectodemites, E. 

 planus Cooper (figs. 9-12) and E. tumida 

 Cooper (figs. 14-16). However, the Corni- 

 gella (figs. 4-6) is indistinguishable from C. 

 tuberculospinosa (Jones and Kirkby) listed 

 by Harlton as C. pushmatahensis in his 

 Johns Valley fauna which has a long range in 

 the Pennsylvanian. Also A mphissites insignis 

 Corneis and Thurman (figs. 19-22), differs 



