Beviev of Recent Geological Literotnrr. 323 
the Appalacliians. lu this case the Cambrian strata are found to lie 
upoa the middle Carl)Ouiferous, and the distance through which the 
older strata have been moved w(^stward, over the younger, by this thrust, 
is between four and Ave miles, and there is reason to believe that the 
Cambrian rocks once extended several miles further westward than they 
are at present found. The entire structure, stratigraphy, drainage, topo- 
graphy, are neatly and concisely described in this l)ripf report. The 
map is based on the U. S. survey topographical sheets, and is a con- 
densed expression of six of them. 
Adcance sheets from the eighteenth report of the Grohnjical siirrei/ of In- 
diana. Ffdeontology. By S. A. Miller. September, 1892. Indianapolis. 
Octavo, pp. 79, and 12 plates of fossils. 
This pamphlet contains descriptions of seventy-six new fossil forms — 
Heceptaculites, Cystites, crinoids, brachiopods, and cephalopods. They 
are from all points of the central area of the United States, mainly In- 
iliana and Missouri, ranging from the Lower Silurian to the Carl)on- 
iferous. 
The Mapping of Mi><xouri. Arthur Win>lo\v. (Trans. Acad. Sci. St. 
Louis, Sept., 1892. pp. 57-99.) The author sketches the history of the 
successive attempts to make a map of Missouri, and illustrates, on re- 
duced scales, some of the early maps, beginning with that of Ptoloma>us, 
edited in Rome in 1508, and extending through the sixteenth and seven- 
teenth centuries when little or no progress was made, to the eighteenth 
and nineteenth in which marked advance has been made in accurac}'^ of 
mapping the region of the Mississippi valley in whicli ^lissouri shares 
a part. 
The United States Coast and Geodetic survey began triangulation 
operations in ]Missouri in 1871, and has carried a network of triangles 
entirely across the state. The Mississippi river commission has accur- 
ately mapped the entire extent of the Mississippi in tlie limits of Mis- 
souri, and the Missouri river commission has delineated the Missouri 
valley in a similar manner, these organizations having done very accur- 
ate work, both in mensuration and topographical delineation. 
The U. S. Geol. survey began, in 1884, to spread its inferior topograph- 
ical work over the state of Missouri, and constructed 25 sheets, on a 
<cale of about two miles to the inch. This work ceased in 1889. 
The Missouri state survey is engaged in making topographical mai)s. 
Mr. Winslow enlarges the scale of the U. S. survey maps — reduces the 
vertical contour interval to 2tl feet, adds township and county lines, rep- 
resents railroads, etc., and produces sheets (now ten in all) of the si/.e of 
16% inches by 20% inches — a quadrilateral of fifteen seconds in extent 
in latitude and longitude, or from 228 to 240 square miles. 
It is notevvorth}^ that for the purposes of the state geological survey 
in this instance, the topographical sheets of the U. S. Geological survey 
are rejected as unsuited and inaccurate, and the state survey proceeds 
to re-map the sanie areas from data supplied by the United States Coast 
.and Geodetic survey, or by tlie river commissions. 
