598 REVIEWS 
The Archean is succeeded by what the author calls the Eparchean,* 
which he says may be called also the 
Banded Ironstone Series, from the usual name of their principal member. The 
characteristic feature of these beds is the peculiar banded, flinty rock, which 
appears under the microscope to be in all probability an altered, fine-grained, 
mechanical sediment silicified and highly charged with ferruginous material, 
arranged in parallel bands. They alternate with sheared conglomeratic and are- 
naceous beds, slates (phyllites), and gneissic bands, which may result either from 
the crushing of acid intrusives or of tuffs. These beds are usually almost 
Vertical meanest 
Any American geologist will notice the resemblance of this series to the 
Algonkian or Proterozoic. The term Eparchean is inadmissible since 
Lawson has used it for the erosion interval at the base of the Algonkian.? 
The presence in Rhodesia of Paleozoic below the Permian is doubtful. 
The latter is a flat coal-bearing, non-marine series of sandstone, shale, 
conglomerate, and occasional limestone. The coal promises to be of 
economic importance. Mesozoic strata are absent. 
The Tertiary (‘‘Forest Sandstone”) consists of red and white sand- 
stone, with occasional conglomeratic or gravelly beds, bands of shale, or 
impure limestone, and great quantities of interbedded basaltic lava. The 
author believes that the sedimentary beds are in large part the result of 
aggradation in an arid climate. Though he constantly refers to them as 
lacustrine, his description would accord well with a subaerial origin. The 
description and photograph (Fig. 8) of the “‘schist country on the plateau” 
are strongly suggestive of a peneplain, though it is not described as such. 
C. W. W. 
Recent Changes in Level in Yakutat Bay Region, Alaska. By RALPH 
S. TARR AND LAWRENCE MartTIN. (Bulletin of the Geological 
Society of America, Vol. XVII, pp. 29-64, 1906.) Pls. 12-23. 
Recent Changes of Level in Alaska. Reprint from The Geographical 
Journal, July, 1906, pp. 30-43. 
No proof of recent shore elevation could be more complete and con- 
vincing than that presented by the authors in these papers. Their physio- 
graphic evidences are: elevated rock benches, elevated sea caves and 
t In the Correlation Table (p. 24) this is included in the Archean, though sepa- 
rated in the text (p. 11). 
2 Andrew C. Lawson, ‘“‘The Eparchean Internal: A Criticism of the Use of the 
Term Algonkian,” University of California, ‘Bull. Dept. Geology, Vol. 3, No. 3- 
Berkeley, Cal., tgo02. 
