IOIO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Davipson, T., and Krinc, W. 
1874. On the Trimerellidae, a Palaeozoic family of the palliobranchs or Brachiopoda. 
Quart. Journ. Geol. Soc., London, vol. 30, pp. 124-173. 
DeEcKER, C. E. 
1931. Stratigraphy and physical characteristics of the Simpson Group. Oklahoma Geol. 
Surv. Bull. 55, pp. 1-112. 
1933. Viola limestone, primarily of Arbuckle and Wichita Mountain regions. Bull. 
Amer. Assoc. Petrol. Geol., vol. 17, No. 12, pp. 1405-1435. 
1935. The graptolites of the Simpson group of Oklahoma. Proc. Nat. Acad. Sci., vol. 21, 
No. 5, pp. 239-243. 
1936. Some tentative correlations on the basis of graptolites of Oklahoma and Arkansas. 
Bull. Amer. Assoc. Petrol. Geol., vol. 20, No. 3, pp. 301-311. 
1941. Simpson group of Arbuckle and Wichita Mountains of Oklahoma. Bull. Amer. 
Assoc. Petrol. Geol., vol. 25, No. 4, pp. 650-667. 
1952. Stratigraphic significance of graptolites of Athens shale. Bull. Amer. Assoc. 
Petrol. Geol., vol. 36, No. 1, pp. 1-145. 
DeEcKER, C. E., and Merritt, C. A. 
1931. The stratigraphy and physical characteristics of the Simpson group. Oklahoma 
Geol. Surv. Bull. 55, pp. 1-86. 
Easton, W. H., et al. 
1953. Revision of stratigraphic units in Great Basin Bull. Amer. Assoc. Petrol. Geol., 
vol. 37, No. I, pp. 143-151. 
Fenton, C. L. 
1928a. The stratigraphy and larger fossils of the Plattin formation in Ste. Genevieve 
County, Missouri. Amer. Midland Nat., vol. 11, Nos. 3, 4, pp. 125-143; pp. 125- 
143. 
1928b. Forms of Strophomena from Black River and Richmond formations. Amer. Mid- 
land Nat., vol. 11, Nos. 3, 4, pp. 144-159. 
1929. Strophomena filitexta Hall a valid species. Amer. Midland Nat., vol. 11, No. 9, 
Pp. 500-503. 
FEenToN, C. L., and Fenton, M. L. 
1924. Some Black River brachiopods from the Mississippi Valley. Proc. Iowa Acad. 
Sci. for 1922, vol. 29, pp. 67-77. 
Fieip, R. M. 
1919. The Middle Ordovician of central and south-central Pennsylvania. Amer. Journ. 
Sci., vol. 48, pp. 403-428. 
FoerstE, A. F. 
1903a. The Cincinnati Group in western Tennessee, between the Tennessee River and 
the Central Basin. Journ. Geol., vol. 11, pp. 29-45. 
1903b. Silurian and Devonian limestones of western Tennessee. Journ. Geol., vol. 11, 
No. 6, p. 557; No. 7, p. 705. 
1909. Preliminary notes on Cincinnatian fossils. Bull. Sci. Lab., Denison Univ., vol. 14, 
pp. 208-232. 
1912a. The Ordovician section in the Manitoulin area of Lake Huron. Ohio Nat., vol. 13, 
No. 2, pp. 38-41. 
1912b. Strophomena and other fossils from Cincinnatian and Mohawkian horizons, chiefly 
in Ohio, Indiana and Kentucky. Bull. Sci. Lab., Denison Univ., vol. 17, 
PP. 17-174. 
1920. The Kimmswick and Plattin limestones of northeastern Missouri. Journ. Sci. 
Lab., Denison Univ. Bull., vol. 19, No. 3, pp. 175-224. 
FurnisH, W. M.; Barracy, E. J.; and Mriter, A. K. 
1936. Ordovician fossils from upper part of type section of Deadwood formation, South 
Dakota. Bull. Amer. Assoc. Petrol. Geol., vol. 20, No. 10, pp. 1329-1341. 
