. Nature . f the Leeds Astronomical Society for 1909(No. 17) shows that this society is endeavouring topopularise the study of astronomy with its wonted addition to numerous interesting papers read bymembers at the meetings of the society, there are a numberof reprints of popular articles contributed to various publi-cations. .Among these are articles on current phenomenacontributed bv Messrs. Whitmell, Scrivpn Bolton, andEllison Hawks, and a series of articles by Mr. Elgie whichappeared in Weekly over the pseudonym July 28, 1910] NATURE RECENT WORK OF GEOLOGICAL SURVE
. Nature . f the Leeds Astronomical Society for 1909(No. 17) shows that this society is endeavouring topopularise the study of astronomy with its wonted addition to numerous interesting papers read bymembers at the meetings of the society, there are a numberof reprints of popular articles contributed to various publi-cations. .Among these are articles on current phenomenacontributed bv Messrs. Whitmell, Scrivpn Bolton, andEllison Hawks, and a series of articles by Mr. Elgie whichappeared in Weekly over the pseudonym July 28, 1910] NATURE RECENT WORK OF GEOLOGICAL SURVEY^.- IV.—The United ^HE United States Geological Survey frequently assistsresearch by publications in which definite subjectsare dealt with Irniii a comprehensive point of view. TheBibliography of North American Geology for 1906 and1907 was issued in 1909. A bibliography of Arch;ean andAlgonkian geology, divided up under the various States, isgiven in Bulletin 300 (pp. 940, 1909), in which Van Hise and Leith review the pre-Cambrian geology ofNorth America. As the title shows, Canada is included,and the summaries given of published work make thisvolume welcome in every library of scientific 364 {1909) is by Messrs. Darton and Siebenthalon the Laramie basin in south-eastern Wyoming. Thename Casper formation is proposed (p. 13) for Carbon-iferous limestones and sandstones resting on pre-Cambrianrocks on both sides of the Laramie Range. The Laramiebeds, over which much discussion has arisen, may be re-presented by the highest sandstones and shales of theCretaceous Montana series, and an unconformity, nowwidely recognised, occurs between this series and theCainozoic beds (pp. 35 and 43). The Laramie question,it may be observed, has been recently discussed by Cross (Proc. Washington Acad. Sci., vol. xi.,1909, p. 27), who proposes the name Shoshone Group forthe beds elsewhere styled Laramie, but lying above theunconformity. The coloured
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