346 



CHALMER L. COOPER 



pies at 120 to 130 feet in depth. A graphic 

 section based on the sample study is shown 

 in text figure 2. -The map (fig. 1) is based on 

 the published state geologic maps of Ten- 

 nessee (1923), Kentucky (1929), Arkansas 

 (1929) and Missouri (1939) and the prelim- 

 inary edition of the new geologic map of 



Alluvium 



Siltstone, yellowish-brown, 

 ^45 fine-grained 



51 Limestone, brownish-gray, 

 fine-grained 



Shale, siltv, brownish-gray, 

 flaky 



52 



95 Shale, silt3% micaceous, glau- 

 100 conitic, flaky 



Shale, silty, micaceous, flaky, 

 calcareous at base 



Shale, silty, calcareous, mica- 

 ceous, glauconitic 



Glauconite, dark green, slight- 

 ly calcareous 



Sandstone, water-bearing 

 Sand, cherty, silty, glau- 

 conitic, fine to coarse 



Fig. 2. — Graphic section showing the beds en- 

 countered in the Cache well and the fossilif- 

 erous zone indicated by the heavy border 

 at the left margin. 



Illinois (Weller, 1939), with some modifica- 

 tions in Missouri. Mr. J. E. Lamar contrib- 

 uted to the stratigraphic discussion. 



FAUNAL DISCUSSION 



The fauna from the Cache well consists of 

 30 species of the smaller Foraminifera, of 

 which more than half (16 species) belong to 

 the family Lagenidae. This is in accord with 

 conclusions based on studies of Eocene 

 foraminifera by Plummer (1927, p. 12), 

 Cushman (1940), and Toulmin (1941). The 

 other families represented are: Ellipsoid- 

 inidae and Anomalinidae, 4 species each; 



and Heterochilicidae, Rotaliidae, and Glo- 

 bigerinidae, 2 species each. Fifteen genera 

 are represented. 



The fauna is distinct from that In the 

 Upper Cretaceous, which can be recognized 

 by its preponderance of Textulariidae and, 

 though very much like that of the Wilcox 

 above, lacks the frequent occurrence of 

 many species of the Miliolidae which charac- 

 terizes the younger group. 



SYSTEMATIC DESCRIPTIONS 



Family Lagenidae Cushman 



Genus Chrysaligonium Schubert 



Chrysaligonium granti (Plummer) 



Plate 54, figures 26, 27 



Nodosaria filiformis Carsey, 1926, Texas Univ. 

 Bull. 2612, p. 33, vol. 7, fig. 8; Upper Cre- 

 taceous, Texas. 



Nodosaria granti Plummer, 1927, Texas Univ. 

 Bull. 2644, p. 83, pi. 5, figs. 9a-d; Midway 

 group, Paleocene, Texas. 



Dentalina granti, Plummer, 1931, Texas Univ. 

 Bull. 3101, p. 149, pi. II, figs. 8, 9; Upper 

 Cretaceous, Texas. — Jennings, 1936, Bull. Am. 

 Paleontology, vol. 23, p. 176, pi. 29, fig. 6; 

 Upper Cretaceous, New Jersey. 



Ellipsonodosaria granti, ? Cushman, 1936, Cush- 

 man Lab. Foram. Research Contr., vol. 2, 

 p. 151, pi. 9, figs. 3-5; Upper Cretaceous, 

 Texas and Arkansas. — Cushman, 1940, idem, 

 vol. 16, p. 69, pi. 12, fig. 3; Midway group, 

 Paleocene, Alabama. 



Chrysaligonium, granti, Toulmin, 1941, Jour. 

 Paleontology, vol. 15, p. 589, pi. 79, figs. 34, 

 35; Salt Mountain limestone, Eocene, Ala- 

 bama. 



Test elongate, slender, slightly arcuate; 

 chambers elongate, cylindrical; wall thick, 

 smooth; suture flush with surface. Diameter 

 of central chamber, 0.16 mm.; length about 

 0.28 mm. 



This form, even though the species is 

 somewhat variable, shows the general char- 

 acteristics. The fragment (pi. 54, fig. 27) 

 shows the apical spine. Its presence in Upper 

 Cretaceous and lower Wilcox beds make it 

 valueless as an index. 



Genus Dentalina d'Orbigny 

 Dentalina cf. D. communis (d'Orbigny) 

 Plate 55, figure 10 



Nodosaria {Dentalina) communis d'Orbigny, 



1826, Soc. Nat. Sci. Ann., vol. 7, p. 254, no. 



35. 

 Nodosaria communis , Cushman, 1923, U. S. Nat. 



Mus. Bull. 104, pt. 4, p. 75, pi. 12, figs. 3, 4; 



Recent, Atlantic, 



