Revieiv of Recent Geological Literature. 185 
vide and the waters from opposite sides of one of the principal streets 
flow down opposite sides of the dome. On one side they flow into the 
Missouri river and on the other into the White river, and each after pas- 
sing half way around the great uplift meets the other again in lower 
Mississippi. 
The description of the caves and springs and their effects upon the 
surface relief is especially instructive, for this is a great cave region, 
though as yet little known. Not in Greene county but near its bounda- 
ries are rivals to the celebrated Mammoth and Wyandotte caverns. 
Of the geological formations represented" in the Greene county area 
the Carboniferous terranes are of especial interest. They are found to 
be easily paralleled with those of the typical sections on the Mississippi 
river, in the northeastern part of the state. The full nomenclature of 
the type localities is adopted. For the Burlington-Keokuk limestones, 
which are easily separable Keye.s' name Augusta in preference to Osage, 
is adopted, and the nominal history discussed at length in order to bring 
out fully the evidence for the conclusions arrived at in this locality. 
Among the economic deposits lead and zinc come in for the greatest 
amount of consideration. Quite full accounts are given concerning the 
manner of occurrence of the ores, the relations of the ore bodies to the 
geological terranes, and the distribution of the metalliferous deposits 
both stratigraphically and areally. Not the least valuable feature of this 
part of the report is the advice regarding prospecting and developing. 
Much historical matter is incorporated in the descriptions of the 
mines. 
The building stones are remarkable in that they form some of the 
most extensively quarried rocks in the state. Closely associated with them 
is an immense lime-burning industry. Some of the largest lime kilns in 
the country are located within the area, and the product is shipped all 
over the Mississippi valley. The historical data given is of great inter- 
est. The clays also are considered at length. Full mention is made of 
the minor deposits that are capable of being utilized. 
The volume of 260 pages is accompanied by a good geological map 
on a scale of two miles to the inch, and by numerous good sections and 
half-tone plates. Professor Shepard is to be congratulated for furnish- 
ing his community with so lucid an account of its mineral resources, 
The report will be looked upon as a model of its kind. 
