Review of Recent Geological Literature. 121 
The Geology and Paleontology of the Cretaceous Deposits of Mexico. By 
Angelo Heilpkin. (Proc. Phi. Acad Nat. Sci. 1890, extras, 1891.) 
It is unfortunate while so much of value has been recently published 
concerning Mexico, that an American should contribute such a mass of 
error as is contained in this brief paper. Prof. Heilprin from a brief 
visit to southern Mexico, concludes that the great Neocomian and Juras- 
sic formations so ably proven by Felix and Lenke are Upper Cretaceous, 
because they contain a hippurite fauna; as does the Upper Cretaceous 
of Europe. Although not much nearer Texas while in the City of 
Mexico than he was in Philadelphia, he devotes most of this paper to 
stating that assignment of the Comanche Series to the Lower Cre- 
taceous by Prof. Hill is wrong, and that that great formation with its 
Neocomian fossils, its Wealdan reptiles and plants, its 4,000 feet of sedi- 
ments stratigraphically below the Dakota sandstone of the Upper Cre- 
taceous, all belongs to the latter formation. We can only refer Prof. 
Heilprin to the rocks, the fossils — plants, vertebrates and mollusca,— the 
writings of Marcou, Roemer, Hill and White, to assure him of the error 
of his conclusions. 
Correlation Papers — Cretaceous. By C. A. White. (Bulletin U. S. 
Geological Survey, Washington, 1891.) In this valuable compilation, 
many instructive pages are devoted to northern Mexico, especially con- 
cerning the development of the Comanche and Upper Cretaceous on the 
Rio Grande near Presudo del Norte, where the former rests on the Car- 
boniferous — the only place in Mexico, so far as known, where the Car- 
boniferous floor has been exposed. Interesting data are also given con- 
cerning the occurrence of the Laramie on the coastal slope near Lam- 
pazos. A valuable bibliography of publications on Mexican paleontol- 
ogy is given, to which we may now add "Preliminary Notes on the Topo- 
graphy and Geology of Northern Mexico," etc. By Robt. T. Hill, 
American Geologist, September, 1891. 
Official Mcqys of the Republic of Mexico, published by the Minister de 
Fomento. Thirty beautiful sheets of the Republic of Mexico illustrat- 
ing the distribution of population, altitude, agriculture, soils, geology, 
railroads and mines, printed iu a most artistic style, ar<e a revelation to 
us of what our friends beyond the Rio Grande are doing for science. 
In addition to these general maps there are several elegant contour 
maps of limited areas giving the topography of the vicinity of IMexico, 
the volcanic peaks of Popocatapetl and Ixahuapetl. These contour 
maps in artistic appearance are only slightly inferior to those issued by 
the leading surveys of Europe and America. 
Part I, treating the political geography, describes the boundaries of 
the state, and gives an extensive table showing all the cantons, depart- 
ments, municipalities and voting places, together with minute descrip- 
tions of the metes and bounds of the canton. A table is also given 
showing the population for the year 1885, and births and deaths. The 
