198 RECORD OF SCIENCE FOR 1886. 



main belt, Meyer entirely overlooks tbe fact that it is there directly over- 

 lain by the very characteristic Orhitoldes limestone of the Yicksburg 

 yroup, under which it disappears southward.* 



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

 River, observed at verj^ low water, from Jackson to Yazoo City, iu which 

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

 toides limestone, although the exact contact was not observed. Sections 

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

 west of Meridian and near Claiborne, confirming the general oi)inion as 

 to the relations of the Vicksburg, Jackson, aud 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 

 rivers 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 

 M'hich the Grand Gulf may be seen in actual superposition 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 uncon form ably. 



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 

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

 below the claibornian profile. | 



31. Heilpriu 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 

 probablj" 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 JSTummelitic formation and the relative antiquity of 

 the Florida peninsula.§ 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., ni, vol. 31, pp. 202-209. 

 t Ibid., vol. 32, pp. 20-25. 



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



II Exploratious onthe West, Coast of Florida and iu the Okeechobie Wilderness [etc.], 

 pp. 65-127, imp. 8vo, Philadelphia, 1886. 

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



