File:Geology (1907) (14589809378).jpg

Identifier: geology00cham (find matches)
Title: Geology
Year: 1907 (1900s)
Authors: Chamberlin, Thomas C. (Thomas Chrowder), 1843-1928 Salisbury, Rollin D., 1859- joint author
Subjects: Geology
Publisher: New York, H. Holt and co.
Contributing Library: Internet Archive
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cado region, and have been described under the namesLoup Fork and Goodnight, though the Goodnight beds are sometimesregarded as Pliocene.4 Terrestrial aggradation was doubtless in progress at many otherpoints in the west, though other considerable formations have notbeen recognized or not differentiated.5 1 See Haworth, Univ. Geol. Surv. of Kan.. Vol. II, p. 2S1. 2 Darton, U. S. Geol. Surv., 19th Ann., Pt. IV, and Camp Clarke and Scotts Bluff,Neb. folios, U. S. Geol. Surv. 3 Johnson, I). W., Geology of the Cerillos Hills, X. M., Sch. of Minos Quarterly,Vol. XXIV, p. 313, 1903. Bibliography given. 4 Scott, Introduction to Geology, p. 518. 6 The relations of the Miocene are shown (under the name of Neocene) on various 270 GEOLOGY Lake and other terrestrial deposits, largely of volcanic material,arc known north of the United Stales, especially in that part ofBritish Columbia l between the Coasl and Gold ranges. The volcaniccenters seem to have been numerous, and along the eastern base of
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Fig. 448.—Smokestack Rock. Conglomerate in the Arikaree formation of western Nebraska. (Darton, U. S. Geol. Surv.) the former range. Miocene deposits are known as far north as theFrancis River, and also on the Porcupine branch of the Yukon; buterosion rather than deposition was the dominant process in Alaska,so far as present data show. Igneous activity during the Miocene. — The wide-spread igneousactivity which began with the close of the Cretaceous and continued, folios of the U. S. Geol. Surv. Both sedimentary and igneous formations are repre-sented. 1 Dawson, G. M., Trans. Royal Soc. of Canada, 1890. THE MIOCENE PERIOD. 271 at least intermittently, through the Eocene, made itself felt also inthe Miocene, and perhaps reached its maximum toward the end ofthat period. The frequent references in preceding pages to igneousmaterials in the sedimentary formations of the system give someidea of the extent of Miocene vulcanism. The eruptions were fromfissures as well as from volcanoes,

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