STATUS OF MESOZOIC FLORAS OF UNITED STATES. 
FIRST PAPER: THE OLDER MESOZOIC. 
By Lester F. Warp. 
INTRODUCTORY REMARKS. 
It is proposed in this paper to give a succinct account of the prog- 
ress thus far made in the direction of developing the Mesozoic floras 
of the United States. The treatment will be primarily in the ascend- 
ing geological order, secondarily in such geographical order as seems 
most natural, and finally in the chronological order of discovery. 
The aim will be to enumerate for the several formations, geographical] 
areas, and special localities the fossil plants that have been found, 
collected, and reported upon, and to give a somewhat complete bibli- 
ography of the work accomplished in strictly paleobotanical lines, with 
special reference to correlation, but without any attempt to treat the 
subject from the stratigraphical or general geological standpoint, since 
this latter task would be much too large, and has, moreover, to con- 
siderable extent, been done already by numerous writers. The strati- 
graphical results thus arrived at will be simply accepted, and the 
horizons will be arranged with reference to them. There will be no 
attempt to republish what has already appeared, and the new matter 
will consist altogether of additional results here published for the first 
time. 
A special feature will be the enumeration of discoveries made and 
of materials collected and in hand, either now in process of elabo- 
ration or to be taken up as early as possible for future publication. 
It is believed that such a paper will be useful not only as showing 
the work that has been done, the results of which are now scattered 
through a great number of volumes of the most diverse character, and 
are difficult to find, but also as indicating the direction and prospects 
of future work along the same lines. 
The paper naturally falls under three general heads, based on the 
general geological nomenclature of the Mesozoic—Triassic, Jurassic,. 
and Cretaceous—which, notwithstanding the difficulty in making the 
, on 
