STRATIGRAPHY. 
41 
The third of the plant localities above referred to is 6 or 7 miles northeast of the 
coal opening last mentioned. It is at a coal mine now known as the "Dutton Creek" 
mine, although it is not on Dutton < reck, but in a ravine leading down to Rock Creek, 
and it may be the llock Creek coal of the earlier reports. The exposures in the neigh- 
borhood are small, and we were unable to determine its stratigraphic relations with 
any of the other coal beds examined or with any established horizon. The evidence 
of the fossil plants, which are abundant in the shales and sandstones immediately 
above the coal, is in favor of correlating the coal with that at Carbon and assigning it to 
a higher horizon than the other coal beds of the Laramie Plains. The following 
species were collected: 
Anemia. 
Glyptostrobus ungeri (?). 
Salix media (?). 
Populus arctica Heer. 
Populus knightii n. sp. Kn. 
Quercus platania Heer. 
Alnus kefersteinii (Gopp.) Ung. 
Corylus macquarrii (Forbes) Heer. 
Trapa n. sp. 
Betula stevensoni Lx. 
Platanus sp. 
Ficus uncata Lx. 
Ficus 2 sp. nov. 
Ficus pseudopopulus Lx. 
Juglans rugosa Lx. 
( rrewiopsis saportanea Lx. 
Asimina eocenica Lx. 
Sapindus n. sp. 
Cissus tricuspidata Lx. 
Fraxinus sp. 
Magnolia tenuirachis Lx. 
Of the fifteen species identified with previously known forms, no less than seven 
are found at Carbon, often in great abundance, and three of these are known from no 
other place. Several of the remaining species are reported from Evanston or in 
higher beds. There can be little doubt as to their affinities with Carbon, and we 
therefore refer these beds provisionally to this horizon. 
It is evident from the preceding notes that the coal-bearing series of the Laramie 
Plains is in large part, if not wholly, older than the true Laramie, as that formation is 
usually defined, although it yields what has been supposed to be a Laramie flora — 
that is, instead of conformably overlying the Fox Hills beds, it is overlain by them 
or included within them. 
Fossils collected from the Montana group at various localities 
west and northwest of Laramie have been determined by Stanton as 
follows: In a sandy layer in the upper beds of shale in the west end 
of The Big Hollow were found Inoceramus bambini, Mactra gracilis, 
and Baculites anceps. In sandy beds a few hundred feet higher, in 
sec. 16, T. 15 N., R. 76 W., the fossils collected are Inoceramus bam- 
bini, Cardium speciosum, and Mytilus cf. subarcuatus, and in still 
higher beds a short distance north of Table Mountain occur large 
numbers of Cardium speciosum, a form which has wide range of 
occurrence in the Montana. In the prominent point a mile east of 
Table Mountain, in the lowest heavy sandstone of the upper part of 
the Montana as here divided, there was found the impression of a 
remarkable egg case of a fish of chimseroid character, classed by Gill 
in the Harriotta, a family which has living forms that are all deep-sea 
dwellers. This sandstone appears in a prominent bluff on the north 
bank of Little Laramie River at the ranch of J. Ernesl in mm-. :;, 
T. 16 N., 11. 76 W., where it yields many fossils, including Inoceramus 
