UPPER CRETACEOUS OF TENNESSEE 391 



Maestrichtian; Le Mans, France/ Cenomanian; Gosau, Austria/ 

 Turonian; Conarapollia, India/ Arrialoor group. 



An analysis of the Coon Creek fauna and comparisons with 

 related faunas will appear in the monograph report. A new 

 species of Scaphites closely related to the well-known form S cap kites 

 nodosus Owen'* is perhaps as diagnostic and as representative a 

 form as any single species of the Coon Creek fauna that might be 

 mentioned. The nodose group of Scaphites are widely distributed 

 in the marine Senonian deposits of the Upper Cretaceous of the 

 world. They have been extensively studied and are an important 

 factor in intercontinental correlations^ of these deposits. 



The ferruginous clay horizon or member of the Ripley is well 

 exposed in a cut on the M. and O. R.R. just south of Falcon in 

 McNairy County. This is a series of stratified micaceous clays 

 about one hundred feet in thickness with numerous concretions 

 of limonite which are very conspicuous on the eroded slopes in 

 the central part of McNairy County. A scant and dwarfed marine 

 fauna has been obtained from this clay in the southern part of the 

 state. Toward the north this clay becomes sandy, loses its identity, 

 and merges into the McNairy sand. 



The McNairy sand member is a thick series of non-marine 

 sands and clays with a few irregular occurrences of quartzites. As 

 is shown on the accompanying map the McNairy sand covers a 

 wide belt of the Cretaceous area and is equally developed in both 

 the northern and southern portions of the state. This member 

 was first differentiated and described by Stephenson^ in 1914. 

 It is typically exposed at a cut on the Southern Railroad near 



'A. d'Orbigny, Faleontologie Franqaise, Terrains Cretaces (Paris, 1840-60). 



^ F. Zekeli, Abhandl. der k.k. Geol. Reichs., Band I (1852); K. A. Zittel, "Die 

 Bivalven der Gosaugebilde," Denkschr. d.k. Akad. d. Wissensch. Wien. Math.-nat. 

 classe, Vols. XXIV and XXV (1865-66). 



3 F. Stoliczka, "Pal. Indica, Cretaceous Faunas, South India," Geol. Survey India 

 (1865-70). 



■•D. D. Owen, Kept. Geol. Sur. Iowa, Wis., Minn., p. 580, Table 8, Fig. 4 (1852); 

 F. B. Meek, U.S.G.S. Terr., Vol. IX, pp. 426-30, pis. and figs (1876). 



5 F. Freeh, "Ueber Scaphites," Centralblatt Min., Geol., Pal., No. 18 (1915), 

 pp. 553-68; No. 21, pp. 617-21. 



E. Kayser, Lehrbiich der Geologie, Teil II, 5. Auf., pp. 534-62 (1913). 



^L. W. Stephenson, U.S.G.S. Prof. Paper '81 (1914). 



