74 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8o 



in order to more accurately compare them. No information of im- 

 portance resulted, as so many unknown factors enter into such a 

 comparison as to render any Hkenesses found to be of little con- 

 sequence. At present there appears but little likelihood of definitely 

 correlating the footprints with fossil skeletons. The chief importance 

 of these footprints, it now seems, is the establishment of adequate 

 faunas for each of these three formations, which in the absence of 

 other fossil criteria may be of future use in correlating these deposits 

 with other track-bearing formations of distant localities. 



LITERATURE 



Branson, E. B. Amphibian footprints from the Mississippian of Virginia. 



Journ. Geo!., Vol. i8. No. 6, 1910, p. 356. 

 Butts, E. Recently discovered footprints of the Amphibian age in the upper 



Coal Measure group of Kansas City, Mo. The Kansas City Scientist, 



Vol. 5, No. 2, 1891, p. 17. 

 . Footprints of new species of amphibians in the upper Coal Measure 



group of Kansas City, Mo. The Kansas City Scientist, Vol. 5, No. 3, 



1891, p. 44. 

 GiLMORE, C. W. Fossil footprints from the Grand Canyon. Smithsonian Misc. 



Coll., Vol. T], No. 9, 1926, pp. 1-41, 12 pis. 

 HiCKLiNG, George. British Permian footprints. Manchester Lit. and Philos. 



Soc. Mem., Vol. 53, 1909, Art. 22, pp. 1-24, pis. I to IIL 

 JiLLSON, W. F. Preliminary note on the occurrence of vertebrate footprints 



in the Pennsylvanian of Oklahoma. Amer. Journ. Sci., (4) Vol. 44, 1917, 



p. 56 (umiamed) 

 King, A. T. Description of fossil footmarks supposed to be referable to the 



classes birds, Reptilia, and Mammalia found in the Carboniferous series 



in Westmoreland County, Pa. Proc. Acad. Nat. Sci. Philadelphia, Vol. 2, 



1844, pp. 175-180, and 7 woodcuts. 

 . Description of fossil footmarks found in the Carboniferous series 



in Westmoreland County, Pa. Amer. Journ. Sci., Vol. 48, 1845, pp. 



343-352, 12 figs. 

 . Description of fossil footprints. Proc. Acad. Nat. Sci. Philadelphia, 



Vol. 2, 1845, PP- 299-300. 



. Footprints. Amer. Journ. Sci., Vol. 49, 1845, pp. 216-217, figs. 



. Footprints in the coal rocks of Westmoreland Co., Pa. Amer. Journ. 



Sci. (2) Vol. I, 1846, p. 268, 2 text figs. 



Leidy, J. Fossil foot tracks of the anthracite Coalmeasures. Proc. Acad. Nat. 

 Sci. Philadelphia, 1879, pp. 164-165, i text fig. 



Lull, R. S. An Upper Carboniferous footprint from Attleboro, Massachu- 

 setts. Amer. Journ. Sci., Vol. 50, 1920, p. 234. 



. Fossil footprints from the Grand Canyon of the Colorado. Amer. 



Journ. Sci., Vol. 45, 1918, p. ZZ"?- 



Marsh, O. C Footprints of vertebrates in the Coal Measures of Kansas. 

 Amer. Journ. Sci., Vol. 48, 1894, p. 81. 



M.\RTiN, H. T. Indications of a gigantic amphibian in the Coal Measures of 

 Kansas. Sci. Bull. Kansas University, Vol. 13, No. 12, 1922, p. 103. 



