HAWORTH AND BENNETT.| AHistory of Field Work. ie 
issued volumes IV and VI of the state reports, ‘and also con- 
tributed an article to volume IJ. Since his removal to Chi- 
eago he has continued his investigations of Kansas paleon- 
tology. 
Professor EK. D. Cope, of Philadelphia, in his position as 
chief paleontologist to Dr. F. V. Hayden, made extensive in- 
vestigations in the Great West, including portions of Kansas. 
His publications are very numerous and confined principally 
to reports issued under the Hayden Survey and to individual 
papers published in the American Naturalist. Two of these 
particularly refer to western Kansas—one on “‘The Fossil Rep- 
tiles and Fishes of the Cretaceous of Kansas,” published in 
1871, and another “On the Geology and Paleontology of the 
Cretaceous of Kansas,” published in 1872. Professor Cope 
did his work principally by subjects rather than by geographic 
areas, and, as a result, touched upon Kansas geology and 
paleontology in many ways and in many different papers. 
Dr. Joseph Leidy, of Philadelphia, a vertebrate paleontolo-- 
gist of great repute in his day, scarcely invaded Kansas, ex- 
cepting by way of identification of Kansas fossils sent him for 
that purpose. 
Prof. O. C. Marsh, of Yale University, a vertebrate paleon- 
tologist ranking with Professor Cope, sent numerous collecting 
parties into the rich fields of western Kansas which gathered 
many valuable fossils that were added to the museums of Yale 
University. In this way Professor Marsh’s name will always 
be connected with Kansas paleontology. 
Prof. J. A. Udden, at one time connected with Bethany Col- 
lege, Lindsborg, Kan., now of Moline, IIl., did considerable 
work in Kansas geology while located at Lindsborg. His work 
was confined principally to paleontology and archeology. 
The third period of geological investigation, as already out- 
lined in these pages, begins with the revival of state surveys in 
Missouri and Kansas. Workers on the Missouri Survey did 
nothing in Kansas proper, but almost all their investigations 
along the border lines, both in the Coal Measures and in the 
lead- and zinc-mining districts, had a direct bearing on Kansas 
geology. One might go even farther and make the same re- 
mark regarding the recent geological survey of Iowa. The 
Coal Measures of Kansas extend across the western part of 
Missouri and up into Iowa. It is probable that any systematic 
classification of formations applicable to one of these states is 
