Review of Recent Geological Literature. 243 
wants it made, at about what cost, graduated or not, with or 
without spirit levels and dial, and of what size inside or out, I 
will send him one at its cost to me, following his directions as 
far as they go, as I am about to have some made. The main 
expense is in the compass. Mine cost about $8.00 of which 
$6.00 was for the compass. The graduation I did myself. By 
the quantity they will be cheaper, yet the price will have a 
wide margin of variation. If one does not want to put out 
much money, for many districts the dial might be omitted, and 
the graduation done at home, and an inexpensive compass 
used, though good enough work can be done to warrant a 
good compass. 
State survey, Houghton, Michigan, August, 1889. 
REVIEW OF RECENT GEOLOGICAL LITERATURE. 
The Neozoic Geology of southwestern Arkansas, [with map. J Bj^ 
Robert T. Hill, assistant geologist, U. S. geological survey. Vol. 
II of the annual report of the geological survey of Arkansas for 1888, 
in four volumes; By .John C. Branner, Ph. D. State geologist, Little 
Rock, 1888. 8vo. pp 290, with appendices. 
This is a careful detailed report of one of tlie most important areas 
of the United States, where the unique Quaternary, Tertiary and 
Cretaceous phenomena of the Soutli meet those of the West, and 
where all the Mesozoic and Cenozoic phenomena of the Southwest bor- 
der upon the older Paleozoic continental outline. 
The geographic position of the region is clearly defined and the 
whole southern region divided structurally into (1) ; an interior or 
older (Paleozoic) division where the structure is more consolidated, 
the streams more permanent, the altitude higher and hygenic condi- 
tions more propitious ; and (2) into the newer (Neozoic) addition, in 
which the structure is unconsolidated, the country low, the drainage 
valleys wide and overflowing, and hygenic conditions proportionately 
malarial. The first of these is the southern industrial and small crop 
region, the latter the planting region, and their relation to the sub- 
structure is hrought out throughout the work. 
The northern limit of the newer or Neozoic continental addition in 
the region described is a remarkable system of mountains, (not to be 
confused with the Ozark system), which extends west from Hot 
Springs, with a few interruptions to the Pan Handle of Texas, and 
which has been the ancient shore line of all the Mesozoic and Cenozoic 
su])sidences, more than five of which are clearly recognizable as shown 
in p 184. It is remarkable that this important orographic system has 
not hitherto been described. 
The topographic features of the region soutli of these mountains is 
