168 KANSAS ACADEMY OF SCIENCE. 
The salt-springs and marshes, which are found in northern Kansas and at 
Lincoln, Neb., obtain their flow from a bed of saliferous shales near the upper 
part of the formation. 
The fossils consist of plants, invertebrates, and vertebrates. Of these, plants 
greatly predominate. Over 500 species are found in the group, of which more 
than ninety percent. are dicotyledonous leaves. Shells are found in the lower 
parts of the group, while vertebrates are represented by impressions of bird 
tracks, a fossil turtle, and a reptilian vertebra. 
BIBLIOGRAPHY, 
In presenting this bibliography of the literature of the Dakota Cretaceous of 
Kansas and Nebraska, the writer is by no means unmindful of the fact that it is 
of necessity incomplete. There are a number of references to the subject to 
which but vague allusions have been seen, and which up to the present time 
have been unavailable. Doubtless there are many more of which the writer has 
never heard. It is believed, however, that the greater part of the literature of 
the group is cited on the following pages. Ordinarily only such articles as have 
a direct bearing on the subject have been referred to, but occasionally a publica- 
tion is mentioned which treats of the Dakota but incidentally; but in such 
cases it will be observed that the point referred to is pertinent to some phase of 
the subject. 
The chronological order has been observed, in order to show more clearly the 
development of the subject; but an alphabetical index at the close will aid in 
locating any particular paper. Complete titles are given unless they are so long 
as to be unwieldy. In references to periodicals, abbreviations are used as much 
as possible. The abbreviations vol. and pp., however, are usually omitted, and 
a colon is used to separate volume and page; thus: Proceedings of the Phila- 
delphia Academy of Science, volume VIII, pages 26 to 38, is written: Proc. Phila. 
Acad. Sci., 8: 26-38. The dates under which the articles are arranged are those 
of the year of publication as indicated by the title-page. 
1804. 
1. Gass, Patrick. A Journal of the Voyages and Travels under Command of 
Captain Lewis and Captain Clarke, p. 27-33. 
1814, 
2. Lewis, Meriwether, and Clarke, William. Expedition up the Missouri River, 
and across the American Continent to the Pacific Ocean, 1: 42-51. 
1841. 
3. Nicollet, J. N. Cretaceous of the Upper Missouri. Am. Jour. Sci., 41: 
180-182. : 
S43. 
4. Nicollet, J. N. Cretaceous Formations of the Missouri River. Am. Jour. 
Sci., 45: 153-165. 
5. Fremont, J. C. A Report on the Exploration of the Country between the 
Missouri River and the Rocky Mountains, etc. Senate document No. 
243, 3d session, 27th congress, p. 12. 
‘ 1853. 
6. Marcou, Jules. Geological Map of the United States. 
1856. 
. Hayden, F. V. Geological and Physical Features of the Upper Missouri 
Region. Report to Lieut. G. K. Warren, Sen. Ex. Doc. No. 76, 2d ses- 
sion, 34th congress, pp. 66-79. 
8. Meek, F. B.,and Hayden, F. V. Descriptions of New Species of Gastropods 
from the Cretaceous Formations of Nebraska Territory. Proc. Phila. 
Acad. Sci., 8: 63-69. 
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