476 MESOZOIC FLORAS OF UNITED STATES. 



sent them all to Professor Fontaine with my notes and labels, embody- 

 ing the results of my studies. He has accepted my names for the new 

 species, except in the cases where his wider experience showed that 

 I was in error, and this accounts for a considerable number of the new 

 species having been named by me. The descriptions, however, are in 

 most cases those of Professor Fontaine. 



Professor Fontaine's mode of treatment above referred to enables 

 me to arrange the localities in a definite order, and I have thought best 

 to make the arrangement chiefl.y geographical, beginning with the most 

 southerly localities in Virginia and proceeding northward. This arrange- 

 ment has the advantage of practically separating the States of Virginia 

 and Maryland. As it is understood that the State Geological Survey 

 of Maryland is to reproduce as much of this paper as is considered desir- 

 able in illustrating the geology and paleontology of that State, it may 

 now, if it prefers, confine itself to that portion of the report relating to 

 Maryland only. The localities faUing within the limits of the District 

 of Columbia are also placed together, although it is understood that the 

 Maryland State Survey includes the District. In treating the locali- 

 ties in the State of Maryland I begin with Rosiers Bluff, on the Potomac 

 River at Fort Foote, and pass from this in a general northeasterly 

 course, following as nearly as practicable the direction of the strike. A 

 number of the Maryland beds yield nothing but vague, indeterminable 

 impressions of plants, but Professor Fontaine has examined the mate- 

 rial, and I leave his remarks upon such localities for whatever the_y may 

 be worth. Those localities which occur on the map (PI. LXXX) are 

 there numbered, and in all such cases the number is given. 



As the paper is not in any sense a systematic one, but whoU}^ geo- 

 graphical and stratigraphical, an alphabetical arrangement of the species 

 enumerated from each of the numerous localities seems upon the whole 

 the most practical and convenient method of treatment. 



REPORT ON VARIOUS COLLECTIONS OF FOSSIL PLANTS FROM TRh uLbtH PolvMAV OF 

 VIRGINIA AND MARYLAND. 



By Wm. M. Fontaine. 



INTRODUCTION. 



A number of years ago I made a large collection of fossil plants from 

 the Lower Potomac of Virginia and Maryland. The results of the study 

 of these fossils were published in 1889 as Monograph XV of the United 



