286 REVIEWS 
to little or no metamorphism since deposition. At Gellivare the rocks 
have been subjected to powerful metamorphic agencies, which have 
caused the magnetites and their included minerals to assume a coarsely 
crystalline phase. The writer regards the Adirondack magnetites as 
illustrations of similar deposits that have undergone a still more extreme 
metamorphism. 1c Bin Oar Oe 
Biennial Report of the State Geologist. North Carolina Geological 
and Bconomic Survey, 191m. sep. 1528 
Discusses the work of the Survey during 1909 and roto as to high- 
ways, hydrography, forestry, magnetic surveys, and fisheries. 
He€ 2e3 
Uranium (Radio-active) Ores and Other Rare Metals and Minerals 
in South Australia. Geological Survey of South Australia, 
TOlde Ep; 12> plates 4; smap a. 
The report gives an account of recent discoveries of large deposits 
of low-grade uranium ores in the Flinders range. The ores occur in 
the oldest rocks of the state; the outcrops consist of a gossan of quartz 
and iron oxides principally, containing 0.2-o0.5 per cent of uranium 
trioxide. The uranium is present as secondary uranium minerals, 
torbernite, autunite, gummite, carnotite, etc. It is stated that values 
are found to increase with depth, and that primary uranium minerals 
are expected to be found shortly. Other rare earths, as ceria, thoria, 
yttria, etc., also occur in the deposits. Ee Cac 
Comparative Sketch of the Pre-Cambric Geology of Sweden and New 
York. By James F. Kemp. New York State Museum 
Bulletin 149, pp. 93-106. 
The oldest rocks of the Swedish pre-Cambrian consist of a great 
complex of both igneous and sedimentary types; the sediments include 
conglomerates, quartzites, limestones, sedimentary gneisses, etc.; and 
the igneous, a great variety of intrusives of the highest interest. It is 
in these rocks that many of the great deposits of iron ore are found. 
Intrusive into this great complex are the Serarchean granites, which 
are divided by Hégbom into four principal types. Following the intru- 
sion of these granites, and closing the Archean, came a period of vast 
denudation, considered by Hégbom as the greatest time-break in the 
history of the earth. On the eroded surface the Jatulian sediments 
