250 The American Geologist. April, i89o 
below the limestone horizon, which he calls Benton limestone, although 
there is difficulty in distinguishing it from the Niobrara. Dr. E, H. S. 
Baily gives the section and some accompanying notes on the salt beds 
in Ellsworth county, with chemical analysis. The salt bed is 140 feet 
thick but is separated into two parts by a bed of gray slate five feet 
thick. The salt contains 96 per cent, of sodium chloride. Prof. F. H. 
Snow discusses the "significance of stipules in certain dicotyledonous 
leaves of the Dakota rocks." Dr. L. Lesquereux has discovered in the 
Kansas Dakota leaves a genus which he has named Betulites, and this 
genus shows the singular character of having a single stipule at the 
base of the petiole instead of a pair, furnishing thus a feature which 
allies our modern dicotyledons with those of the Cretaceous. In a 
lecture Prof. Hay reviewed the geology of Kansas. Mr. E. Jameson 
gives the geology of the Leavenworth deep well, which went down 
2116 feet. It gave indications of petroleum and gas, but failed because 
of the impossibility of shutting off the voluminous flow of water. Prof. 
Hay describes the saliferous horizon of the Triassic, stating that these 
beds are continuous without break into the Permo-Carboniferous. 
Prof. Snow gives the result of an examination of the Logan county so- 
called nickel mines. This was noted in the American Geologist, vol. 
Ill, p. 216. Profs. Blake and Bailey made a thorough examination of 
the evaporating power, composition and peculiarities of Kansas coals. 
It was found that they depreciate in their steam-producing powers, 
and in their content of fixed carbon, from the southeastern part of the 
state toward the north and west. 
Application of descriptive geometry to a series of problems in locating 
faulted beds or veins. By E. H. Williams, Jr. A brochure of 23 octavo 
pages, Bethlehem, Pa. These problems and their solution, embracing 
most of the irregularities with which miners have to contend, will be 
useful in mining schools where the methods of nature in concealing 
her coal, iron and other valuable beds, are reduced to geometric fig- 
ures and mathematical formulae and revealed to the student. 
Bibliography of North American vertebrate paleontology 
FOR the year 1889. By John Eyerman, Easton. c indicates illustra- 
tions in the text ; pi. plates. 
1. Cannon jr. G. L. Brief remarks on horned Dinosauria. Proc. Col- 
orado Scientific Society, Jan. 15, 1889. 
2. Cannon jr. G. L. On the Tertiary Dinosauria found at Denver, 
Col. Proc. Col. Sci. Soc. Vol. 3, part i, p. 
140. 
a. Baur G Paleeoliatteria, Credner and the Proganosauria 
Am. J. Sci. Vol. 37, p. 310. 
3. Cope E. D An intermediate Pliocene fauna. Am. Nat. 
April, '89, p. 355 (253). 
4. Cope E. D A Review of the North American species of 
Hippotherium, 29 p. 3 pi. Proc. Am. Phil. 
Soc. Vol. 26, 429. 
