Review of Recent Geological Literature . 
179 
Livingston folio (1), in Montana, by Arnold Hague, Joseph P. Id- 
dings, and Walter H. Weed. 
Pike’s Peak folio (7), in Colorado, by Whitman Cross; with a special 
map and description of the Cripple Creek mining district, by Whitman 
Cross and R. A. F. Penrose, Jr. 
Anthracite-Crested Butte folio (9, price 50 cents), in Colorado, having 
two sets of map sheets and descriptions, by Samuel Franklin Emmons 
and George H. Eldridge. 
Lassen Peak folio (15), in California, with illustrations of recent vol¬ 
canic activity (about 200 years, and again somewhat more than 50 years 
ago), by J. S. Diller. 
Smartsville folio (18), in California, by G. F. Becker, Waldemar Lind- 
gren, and H. W. Turner. 
Marysville folio (17), in California, also by Messrs. Becker, Lindgren, 
and Turner. 
Placerville folio (3), in California, by Messrs. Becker, Lindgren, and 
Turner. 
Sacramento folio (5), in California, by Messrs. Becker and Lindgren. 
Jackson folio (11), in California, by Messrs. Becker and Turner. 
One folio belongs to the Atlantic coastal plain; ten folios map and de¬ 
scribe districts of the Appalachian mountain belt; three folios belong to 
the Rocky mountains: and the remaining six to the Sierra Nevada re¬ 
gion and the contiguous Sacramento valley. w. u. 
Ueber Archceisehe Ergupsgesteine aus Smaland. By Otto Nor¬ 
denskjold. (Bull. Geol. Instit. Upsala, no. 2, vol. i, 1893.) The term 
halleflinta (eurite and granulite) has been used indiscriminately to cover 
a great variety of compact microcrystalline, more or less banded rocks. 
Recent microscopic investigation of these pre-Cambriap microcrystal¬ 
lines, in the light of the results of the study of post-Cambrian volcanics, 
is rapidly revealing the diversity of rock-types found among them. 
Some of the so called halleflintas proved to be indurated sediments, or 
tuffs, and many of them are ancient effusives or other igneous rocks. 
This service of identification and classification Dr. Nordenskjold has 
accomplished for the Swedish halleflintas, which prove to include both 
rocks of sedimentary and of igneous origin. 
Halleflintas play an important role among the geological formations 
of Sweden, where they constitute a considerable portion of the Archean 
rocks, and where they carry the metalliferous ores. In Smaland, a dis¬ 
trict in southeast Sweden, embracing the provinces of Jonkolping, 
Kronoberg and Kalmar, they occur in four more or less parallel bands, 
having a length of from 60 to 100 kilometres and a breadth of from 10 
to 15 kilometres. The most northerly of these bands, that of the region 
of Sjogelo, has been the subject of detailed study on the part of the 
author. 
While exhibiting some phases of the crystalline schists, with which 
they have always been classed, Dr. Nordenskjold finds that the halle¬ 
flintas are unmistakably united by transition phases with massive 
granular rocks. The structures and other features described by the 
