Relazione biennale per il 1913 e 1914; rapporto amministrativo ed economico e carte geologiche . posiziona le piste sono anche piuttosto delicato e theadjacent flood zone di pianura hanno una notevole larghezza. Significato delle relazioni nei luoghi in cui il loess rompe bruscamente vicino alla parte superiore di thehill e non si estendono lungo la discesa al di sotto del livello della parte superiore del thedrift, si è pensato che i flussi hanno sottoquotato i loro banche e thuswidened le loro valli fin dal tempo dei grandi deposizione del loess. In questo processo il loess che era stato depositato sul precedente piste removedas era il lavoro di val

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Biennial report for 1913 and 1914; administrative report and economic and geological papers . places the slopes are also rather gentle and theadjacent flood-plain areas have considerable width. Significance of Relations In the places where the loess breaks off abruptly near the top of thehill and does not extend down the slope below the level of the top of thedrift, it is thought that the streams have undercut their banks and thuswidened their valleys since the time of major deposition of the loess. Inthis process the loess that was deposited on the earlier slopes was removedas the work of valley widening by side cutting of the streams was accom-plished. At these localities the undercutting has taken place so recentlythat the banks are still steep, and no appreciable amount of loess has sincebeen deposited upon them. In most places where the loess continues down the hills for a consider-able distance below the top of the drift, the slopes are long and gentle, acondition that indicates that undercutting has not been in progress therefor a long time. II BULLETIN NO. 30, PLATE HI. T.6 N. 9000 46 30 A Outcrop* Drill hole6TS Elevation of loess-drift contact it. LOESS IN CANTON QUADRANGLE 113 There are two possible ways in which the presence of the loess overthe slopes below the top of the drift may be explained: (1) The loess maybe assumed to have been brought down from higher levels by slumping andsheet wash; and (2) it may be assumed to have been carried up by the windsfrom adjacent flood-plain areas and deposited on the slopes where it is.nowfound. By the first assumption practically all the loess on such slopes wouldbe of secondary origin; whereas by the second, the loess would be largelyin its original position. The first hypothesis is thought to be inadequate, although slumpings orlandslides are very common along the steeper slopes in this region, especiallyin places where the drift rests upon Pennsylvanian shale. Such slides orslumps were doubtless important facto

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• bookpublishe
• booksubjectgeology