02368cam a22003013u 450000100060000000300070000600500170001300600020003000700050003200800410003704000110007804100170008905000070010610000390011324500920015226400510024430000470029533600260034233700260036833800360039450000310043050801150046152013280057653400450190465300570194985600430200699900170204949966UtSlPG20260610134140.0mcr n260607r2015||||utu|||||o|||||||||||||| d  aUtSlPG 7aen2iso639-1 4aQE1 aRobinson, Charles Sherwood,d1920-10aGeology of Devils Tower National Monument, Wyoming :bA Contribution to General Geology 1aSalt Lake City, UT :bProject Gutenberg,c2015  a1 online resource :bmultiple file formats  atextbtxt2rdacontent  acomputerbc2rdamedia  aonline resourcebcr2rdacarrier  aRelease date is 2015-09-14  aProduced by Stephen Hutcheson, Dave Morgan and the Online
Distributed Proofreading Team at http://www.pgdp.net  a"Geology of Devils Tower National Monument, Wyoming" by Charles Sherwood Robinson is a scientific publication written in the mid-20th century. This book delves into the geological features and history of Devils Tower, an iconic geological formation in Wyoming. It provides a comprehensive overview of the Tower's structure, the types of rocks present in the area, and the geological processes that have shaped the landscape over various geological periods.  The book begins with an introduction to the significance of Devils Tower, emphasizing its status as the first national monument established by President Theodore Roosevelt. It describes the Tower's composition, primarily igneous rock termed phonolite porphyry, and outlines the various sedimentary formations surrounding it, dating from the Triassic to the Jurassic period. Robinson discusses the geological history of the region, highlighting theories regarding the Tower's origin, including its potential classification as a volcanic neck or an intrusive igneous body connected to a deeper magma chamber. Additionally, the book elaborates on the geological processes such as erosion, faulting, and the structural characteristics of the rock formations, supported by illustrations and maps that provide visual context. (This is an automatically generated summary.)  nOriginal publication data not identified  aGeology -- Wyoming -- Devils Tower National Monument40uhttps://www.gutenberg.org/ebooks/49966  c90804d90804