^8 'Review of decent Geological Literature. 
then in readiness for publication; and these liave since been supplied in 
Bulletin No. 37 of the U. S. geological survey, entitled Types of the Lar- 
amie flora, containing 115 pages and 57 plates, on which the same figures 
are reproduced. Both these reports are preliminary to the author's 
forthcoming monograph. Among the new species the genus Populus 
claims ten; Quercus, two; Corylus and Alnus, each one; Betula, two; 
Platanus, one; Ficus, five; Ulmus, four, all from a single locality in Mon- 
tana, being the first record of this genus in the Laramie flora; Vitis, four; 
Celastrus, seven, again constituting the first Laramie record of the genus; 
Grewiopsis, five, only two species having been previously recorded in the 
Laramie; Pterospermites, three, its first Laramie record; Cocculus, Lir- 
iodendron. Magnolia, and Diospyros, each one; and Viburnum, ten. 
Only two of these genera, namely, Grewiopsis and Pterospermites, have 
become extinct. 
The similarity of the early types of phenogamous plants with those of 
the present time is well shown hy their occurrence in the Laramie flora, 
including the author's table and his later additions, of seventy-four phen- 
ogamous genera that are still living, while only twenty-two have perished, 
nine of these last indeed being scarcely distinguishable from their present 
generic representatives in the living flora. Not so many as a half dozen 
phenogamous species, however, have come dowm to us from the Laramie 
period, nor in total from the Eocene, Laramie, and Senonian floras. Four, 
all belonging to the Laramie , are so recorded. These are well known 
species of our northern temperate flora and limited to North America, 
namely, the two common species of hazel-nut, the butternut, and Vibur- 
num pubescens, Pursh. 
Oh an Archeean plant from the ivhite crystalline limestone of Sussex county, 
JV. y., By Dr. Brixton. (Annals, N. Y., Acad. Sciences, vol. iv, Feb- 
ruary, 1S88, pp. 123 124, pi. VII.) 
In one of the detached areas of the white crystalline limestone in Sus- 
sex county N. J., Dr. Britton has found black filmy bands of graphite 
parallel to the bedding of the limestone. These bands reaching in some 
cases a thickness of 0.5 mm. and measuring about 3 mm. in width, are 
found in broken fragments averaging about 6 cm. in length, apparently 
having formed matted patches which are now transformed to thin strata 
of carbon. Though it seems probable that mineralogists as well as paleo- 
botanists will question its vegetable nature, and protest against its addi- 
tion to the already large number of problematical organisms, still, what- 
ever its ultimate fate may be, it enjoys today the distinction of being the 
the oldest impression that has yet been referred to the vegetable kingdom. 
Without attempting to indicate a more definite aflinity than its probable 
relation to the Algae, Dr. Britton has figured and named this new species, 
in honor of Dr. Newberry, as Archceophyton neivberryanum. 
Geological Survey of Ohio, Vol. VI, Economic Geology. Edward Orton, 
state geologist. 
The bulk of this volume is devoted to petroleum and natural gas, with 
valuable chapters on salt, bromine, cement, gypsum, lime etc.. To the 
