re nae 
1894.] Geology and Paleontology. 795 
of determining the stratigraphical position of the beds in which the 
fossils occur. The whole of this region consists of a series of sandstones 
that have been treated in the Black Hills report as the “ Dakota Group.” 
In examining a locality two miles west of Minnekahta Creek, Mr. Ward 
found, interstratified with the sandstones, some argillaceous shales con- 
taining a fossil flora of ferns, coniferous twigs and cycadean remains, 
which the author refers to the Lower Cretaceous. A further study of 
the plants by Prof. Fontaine and Prof. Knowlton confirms this refer- 
ence. Between the horizon where these fossils were found and that of 
the true Dakota Group there are some hundreds of feet of sandstone 
and shales. (Journ. Geol., Vol. II, 1894.) 
Lower Eocene Mammals near Lyons, France.—A pre 
liminary note published by M. Charles Deperet in Comptes Rendus, 
April, 1894, states that a remarkably rich deposit of Eocene Verte- 
brates has been discovered in a quarry at Lissien, near Lyon. The 
author proposes to make these fossils the subject of a special memoir, 
but meanwhile, he gives the following brief summary of the most im- 
portant facts : 
“ The [Perissodactyla] are the most numerous. At the head of the 
list stands Lophiodon, represented by three forms: one, having molars 
of the type named by M. Riitimeyer, L. rhinoceroides, but the body not 
quite so large. A second species resembles in form L. isselense, but is 
distinguished by its inferior premolors which have the cingulum very 
attenuated, recalling in this particular L. euvieri of Jouey. The third 
form has a large premolar furnished with a rudimentary internal pos- 
terior cusp, as in L. lautricense. 
“The American genus Hyrachyus is represented by a type that I 
believe to be identical with Lophiodon cartieri Egerkingen, and also a 
species of Argenton, named by M. Filhol Hyrachyus intermedius. 
“The group [Lophiodontidae] is still more abundant. I can only 
mention two Paloplotheria, one large (P. magnum Rütimeyer), the 
other hardly larger than P. codiciense Gaud. to which it is evidently 
related, from the structure of the premolars. 
“The genus Propalaeotherium is represented by two species, one 
large, indentical with P. isselanum Cuv.; the other small, suggesting 
P. minutum Egerkingen. A small Anchilopus seems to be related to 
A. desmarestii Gerv. Finally, there are some inferior molars which 
correspond to those of the ill-defined genus Lophiotherium Gerv. 
“Among the Artiodactyla I have noticed the molars of Acotherulum 
saturninum Gerv., and one fine demi-mandible of a Dichobune smaller 
than D. leporinum. 
