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Bulletin of the Geological Society of America (1923) (14781879005)


Bulletin of the Geological Society of America (1923) (14781879005)



Identifier: bulletinofgeolo341923geol (find matches)
Title: Bulletin of the Geological Society of America
Year: 1890 (1890s)
Authors: Geological Society of America
Subjects: Geology
Publisher: (New York : The Society)
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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l deposits* at similar elevations and close to the driftlessPalouse Hills are known at Pantops, along the Inland Empire Highway,and elsewhere. The deposit at Pantops is at least 30 feet deep and pos-sesses current bedding with southward dip. It lies on the basalt plateaunot more than a mile west of the base of Moran Peak, at an altitudfe closeto 2,400 feet above tide. The gravel in the deposit is not stained orcemented; it looks as fresh as Wisconsin gravel in the Great Lakes re-aion. Scattered throuoJi it are hundreds of srranite boulders averao-injr3 feet in diameter, many of them exceeding 10 feet. The gravel is notcoarse, there are no cobble phases in it, and the boulders are wholly outof accord with the gravel as a stream deposit. Furthermore, tlie bouldersare subangular and shoAv considerable decomposition of the granite ontheir less-rubbed surfaces. They doubtless are a local contril)ution, de- ■* Named steptoes by Russell. 582 J. H. BRETZ GLACIAL DRAINAGE OX COLUMBIA PLATEAU
Text Appearing After Image:
THE SPOKANE GLACIATIOX 583 rived by glacial plucking of the decayed granite on the northern flanksof Moran Peak and Mica Peak. They are boulders of decomposition anddoubtless were easily quarried by the ice. Their abundance in the graveland the little rubbed condition are clear indications that the front of theice-sheet did not advance far beyond this place. Despite the fresh appearance of the gravel at Pantops, the topographygives no clue to its presence. From Mdiat can be seen now, it is difficultto determine whether the Pantops gravel is a kamey deposit or is a rem-nant of a valley train or outwash plain. It blends into the loAver slopesof Moran Peak and the basalt plateau. There are other gravel deposits on the plateau immediately south ofSpokane, similar to that at Pantops in altitude, bedding, freshness ofmaterial, and absence of fluvio-glacial forms, but none possess thegranitic boulders of decomposition. Vicinity of Spangle.—The village of Spangle is 12 miles almost di-rectl

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bulletin of the geological society of america 1923
bulletin of the geological society of america 1923