520 REVIEWS 
ashes which cover the cone. Since these lavas are similar to those 
found in the crater, the authors regard them as vestiges of the latest 
flow, from which the areas connecting them with those above have been 
removed by erosion. The lineal character of the ridges, however, and 
their prominence, seem to the writer sufficient evidence for regarding 
them, as is usually done, lateral outbursts through the side of the cone. 
The work is illustrated by several fair plates giving sketches of 
portions of the volcano. The employment of photographs for pur- 
poses of illustration would have been, however, more satisfactory. 
OLIVER C. FARRINGTON. 
RECENT WORK ON THE CARBONIFEROUS OF 
KEINISINS: 
_ Stratigraphy of the Kansas Coal Measures, by Erasmus Haworta, 
Kansas Univ. Quart., Vol. III, pp. 281-295, 1895. 
Classification of the Upper Palaeozoic Rocks of Central Kansas, by 
CHAS. S. PRossER. Journal Geology, Vol. III, pp. 682-705 
and 764-800, 1895. 
Permian System of Kansas, by F. W. Cracin. Colorado College 
Studies, Vol. VI, pp: 1-48, 1896. 
A generation ago the upper Carboniferous succession in Kansas 
was the subject of prolonged and ofttimes somewhat acrimonious 
discussion. Since the close of that memorable debate there has been 
until very recently very little investigation undertaken in the state. 
So, for more than a quarter of a century practically nothing has been 
done to clear up the doubt concerning the question of the natural sub- 
divisions of the Carboniferous system of that region; and for the 
same period little attempt has been made to decipher the stratigraphy 
of the formations which constitute the whole eastern third of the 
state. 
Of late, within a few months of one another, three important 
memoirs have appeared which have greatly extended our knowledge of 
the stratigraphy of the region. These contributions, primarily to 
Kansas geology, are by Dr. Erasmus Haworth, Professor Charles S. 
Prosser, and Professor F. W. Cragin. ‘The work along the three lines 
being undertaken without regard to one another the results are in no 
way directly connected. While this method of treatment has the 
