6 Bulletin 9 198 



and the extensive northern overlapping of the Vicksburg 

 throughout that State was noted. (See Am. Geol., vol. 18, 

 p. 236. ) A large collection was made from the classical old 

 Shell bluff on the Savannah. Later on, in the latter part of 

 August, collections were made from Eocene and Miocene 

 exposures along James, Rappahannock and Potomac rivers in 

 Virginia and Maryland, a region that will be thoroughly inves- 

 tigated during the present summer. 



T. H. Aldridi' s collection of fossils and draivings.— Mr. 

 Aldrich has very kindly lent the greater part of his type col- 

 lection of Lignitic mollusca for inspection during the preparation 

 of this work. These as well as the drawings used in Bulletin 8 

 have been of great service. 



The author's works and field notes on this stage in Ar- 

 kansas and Alabama. — - Man}^ detailed sections of Lignitic 

 exposures in Arkansas are given by the author in vol. 2, of the 

 annual report of the Geological Survey of that State for 1892 ; 

 but no zoogene fossils were found. In 1893-94 he twice visited 

 some of the famous Alabama exposures, once while in the 

 employ of the State Survey of Texas and once while in quest 

 of fossils for his own cabinet. These together with his English 

 and Paris basin fossils have been very serviceable during the 

 preparation of this work. 



SieCTION I. STRATIGRAPHY. 



Texas. 



Refere7ices : — First A^in' I. Rept. Geol. Survey Tex., i8Sp, p. 22, 



et seq., — Penrose. Geological Siirvey of Texas, 



Report on the Brown Coal and Lignite of Texas, 



i8g>2, p. ijo et seq., — Diimble. 2d Ann' I. Rept. 



Geol. Sur. Tex., i8gi , p. 50 et seq., — Kennedy. 



But little is definitely known regarding the Lignitic beds of 



Texas. Penrose was the first to study them with any degree 



of care. Owing however to the lack of molluscuous remains 



throughout nearly their whole extent, it is impossible to 



accurately define them geographically or stratigraphically. 



Below is a brief summary of our present knowledge on the 



subject. 



Rio Grande. — It is possible that beds belonging to the Lignitic 

 stage will be found along the Rio Grande ; but at present there 



