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. Eld ridge. 
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, Waldeinar 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. r. 
Ueber Archoeische Ergussgesteiwe wits Sm&land. By Otto Nor- 
denskjolo. (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-Cambrian microerystal- 
lines, in the light of the results of the study pf 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. Nordenskjqld 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 Arehean 
rocks, and where they carrj 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 Wands, 
having a length of from GO to 100 kilometres and a breadth of from 10 
to 15 kilometres. The most northerly q| these hands, that of the region 
of- Sjogeloj 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, Dtp. Njordenskjold finds that the h&lle 
rlintas are unmistakably united l>y transition phases with massive 
granular rocks. The structures and other features described bj the 
