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Titolo:
Summary of Quaternary geology of the Municipality of Anchorage, Alaska
Autore:
Schmoll, HR; Yehle, LA; Updike, RG;
Indirizzi:
US Geol Survey, Lakewood, CO 80225 USA US Geol Survey Lakewood CO USA 80225 Geol Survey, Lakewood, CO 80225 USA
Titolo Testata:
QUATERNARY INTERNATIONAL
, volume: 60, anno: 1999,
pagine: 3 - 36
SICI:
1040-6182(1999)60:<3:SOQGOT>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTH-CENTRAL ALASKA; COOK INLET REGION; TEPHRA DEPOSITS; HOLOCENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
119
Recensione:
Indirizzi per estratti:
Indirizzo: Schmoll, HR US Geol Survey, Box 25046 MS 966, Lakewood, CO 80225 USA US Geol Survey Box 25046 MS 966 Lakewood CO USA 80225 0225 USA
Citazione:
H.R. Schmoll et al., "Summary of Quaternary geology of the Municipality of Anchorage, Alaska", QUATERN INT, 60, 1999, pp. 3-36

Abstract

Quaternary geology of the Upper Cook Inlet region is dominated by depositsof glacier retreats that followed repeated advances from both adjacent andmore distant mountains. At several levels high on the mountains, there areremnant glacial deposits and other features of middle or older Pleistoceneage. Late Pleistocene lateral moraimes along the Chugach Mountain front represent successively younger positions of ice retreat from the last glacialmaximum. As the trunk glacier retreated northeastward up the Anchorage lowland, Cook Inlet transgressed the area, depositing the Bootlegger Cove Formation and Tudor Road deposits. The glacier then readvanced to form the latest Pleistocene Elmendorf Moraine, a prominent feature that trends across the Anchorage lowland. Extensive alluvium was deposited both concurrently andsomewhat later as Cook Inlet regressed. Mountain valleys contain (1) locally preserved moraines possibly of early Holocene age; (2) poorly preserved moraine remnants of older late Holocene age; and (3) well-preserved moraines formed mainly during the Little Ice Age. Glaciers still occupy large parts of the mountains, the upper ends of some mountain valleys, and small cirques. Holocene landslide deposits, including those formed during the great Alaska earthquake of 1964, occur throughout the area, especially along bluffs containing the Bootlegger Cove Formation. (C) 1999 Elsevier Science Ltd and INQUA. All rights reserved.

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Documento generato il 03/07/20 alle ore 15:15:39