THE SANDS AND ORDER OF OCCURRENCE 449 



Lapara (Dumble),- carrying in the ISTueces section vertebrates determined 



by Cope to be of Blanco Pliocene age. 

 Oakville (Dumble)/ with vertebrate fossils determined by Cope to be of 



Loup Fork Miocene age. Plant remains uiistudicii. 

 Catahoula (Veatch)/ continuation of bods in Louisiana and carrying 



plant remains. Oligocene. 

 Wellborn (Kennedy)/ with marine invertebrates which Harris referred 



to the Lower Claiborne, and were, therefore, correlated by Kennedy 



with the Fayette, but which Vaughan''' now considers Lower Jackson. 



Middle or Upper Eocene. 

 Fayette (Dumble)", with marine invei'lebrates determined by Harris and 



referred to Lower Claiborne. IMant remains unstudied. Middle 



Eocene. 



So far as known, there is no place within the belt where all of these 

 sands are present, unless it be on the Colorado Eiver. 



On the Rio Grande the Fayette is overlain by the Frio, and this by the 

 Oakville. There is no evidence of the Catahoula. 



On the Sabine, while the Oakville may be present as such above the 

 Catahoula, no evidence has yet been found of either the Wellborn or 

 Favette beneath it. 



In the region ])etween, other conditions prevail, and this has led to such 

 confusion that it seems best to bring togethei' what has been done in order 

 to clear away, as fai- as possible, the misunderstandings that have arisen 

 iiiul open tlie ro;i(l foi' the final solnlion of the problem. 



Review of i-revious Work 



Hilgard,'* who made a geological I'cconnaissance of Louisiana in 1869, 

 visited some localities in east Texas, where he found the extension of his 

 Grand Gulf beds. These he described and referrcfl to that age. 



Loughridge^ reports that this belt of sandstone, beginning on the Sa- 

 bine, in the lower part of Sabine County, outcrops on the Trinity near 

 Trinity station, near Chapel Hill and Burton, at La Grange Bluff, at 

 Hellgate Ferry near Cuero, and then forms a line of hills, via Oakville, 

 southwestward thniuoh |)u\al Cnuiitv lo tlie Rio Grande at Rio Grande 



^Journal of Geologj-, Sept., lS'.t4, \>. .">.".0. 



3 Journal of Geology, Sept., 1804, p. 55G. 



* U. S. Geological Survey Prof. Paper 4(5. p. 4:.'. 



'' Fourth Ann. Repl. Geol. Surv. Texas, p. 4."). 



' U. S. Geological Survey Water-supply Paper No. ."..'io. p. 



^ Journal of Geology, Sept., 1894, p. 552. 



» Am. Jour. Sci., 2d sor., vol. 48, 18B0, pp. :'..!7-."..'!S. 



» Cotton Production, Tenth Census, p. 21. 



