198 RECORD OF SCIENCE FOR 188G. 



main l)0Jt, Meyer ciitiroly overlooks tlie fact tliat it is tli(>re <lirectly over- 

 lain by the very characteristic Orhitoitle^ limestone of the N'icksbnrg 

 yronp, under which it disapijcars southward.* 



29. A few months later Langdou describes a section along the Pearl 

 Uiver, observed at verj' low water, from Jackson to Yazoo City, in which 

 a general southern dip is found, and the Jackson beds underlie the Orhi- 

 toide.s limestone, although the exact contact was not observed. Sections 

 are described at St. Stephen's Bluff, Bladen's Springs, near Enterprise, 

 west of Meridian aiul near Claiborne, confirming the general opinion as 

 to the relations of the Vicksburg, Jackson, and Claiborne beds.t 



30. In July Meyer makes another contribution to the question, giving 

 an account of a special visit to the region. Owing to high water in the 

 riveis he was obliged to rely upon exposures in railroad cuts but found 

 the latter very satisfactory. An abstract of his results is as follows : 

 Between Pelahatchee and Brandon the Grand Gulf strata are found 

 for five miles at a higher level than the Marine Tertiary west of it, and 

 which are either nearly horizontal or dip strongly westward. At Bran- 

 don the marine strata dip over the grand gulf clays, and at the contact 

 have only a thickness of two feet. He can not find a single instance in 

 which the Grand Gulf may be seen in actual superj^osition on the Ma- 

 rine Tertiary, but on the contrary finds two localities where strata which 

 can not be distinguished from Grand Gulf may be seen actually overlain 

 by Marine Tertiary, and in one case unconformably. 



The Grand Gulf formation is considered to be, at least in greater part, 

 non-marine. A thick and extended marine greensand formation is found 

 in eastern Mississippi, which carries a Claibornian fauna approaching 

 the Jacksonian, and is thought to be parallel to the strata immediately 

 below the claibornian profile. | 



31. Heilprin reports on Tertiary fossils from several localities in the 

 Gulf States. Some specimens from San Augustine County, Tex., are 

 thought to represent the " Claibornian" horizon, and are from deposits 

 probably in the Jacksonian area. Some specimens from Paducah, 

 Ky., indicate the Lower Eocene; and N. Floridanus and other species 

 from near Gainesville, Florida, confirm his opinion of the broad ex- 

 tent of the southern Nummelitic formation and the relative antiquity of 

 the Florida peuinsula.§ The same author has issued the second part of 

 his paper on the west coast of Florida || in advance of the first; but this 

 incomplete publication can not fairly receive attention in this review. 



32. Kost^ gives a preliminary account of the geology of Florida, in 



* Science, vol. 7, p. 11. 

 t Am. Jour. Sci., iii, vol. 31, pp. 202-209. 

 tibid., vol. 32, pp. 20-25, 



§ Philadelphia Acad. Sci. Proc, vol. 37, pp. 57-5^. 



II Explorations on the West Coast of Florida and in the Okeechobic Wilderness [etc. ], 

 pp. 6r)-l27, imp. 8vo, Pliiladelphia, 1880. 

 H American Assoc. Proc, vol. 35, p. 231, 



