Notes on the Geology of the Alaska Peninsula and the Aleutian Islands
Abstract: During the spring of 1932 an opportunity was offered by the United States Navy for a geologist to accompany an expedition organized to make a reconnaissance of the western part of Alaska Peninsula and the Aleutian Islands. This expedition visited several localities the geology of which was...
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United States. Government Printing Office.
1934
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ftunivnotexas:info:ark/67531/metadc304241 2023-05-15T18:48:14+02:00 Notes on the Geology of the Alaska Peninsula and the Aleutian Islands Geological Survey bulletin Mineral resources of Alaska United States Geological Survey Bulletin 857-D United States Geological Survey Reports Capps, Stephen R. Geological Survey (U.S.) United States - Alaska 1934 16 p. : maps 23 cm. Text https://digital.library.unt.edu/ark:/67531/metadc304241/ English eng United States. Government Printing Office. oclc: 883253278 sudoc: I 19.3:857-D rep-no: USGS Bulletin 857-D https://digital.library.unt.edu/ark:/67531/metadc304241/ ark: ark:/67531/metadc304241 Mineral resources of Alaska, 1932; pp. 141-153 Geology -- Alaska -- Alaska Peninsula Geology -- Alaska -- Aleutian Islands Geology Report 1934 ftunivnotexas 2017-03-04T23:06:57Z Abstract: During the spring of 1932 an opportunity was offered by the United States Navy for a geologist to accompany an expedition organized to make a reconnaissance of the western part of Alaska Peninsula and the Aleutian Islands. This expedition visited several localities the geology of which was little known. It was found, as had already been expected, that the islands west of Unimak Pass are composed mainly of basic volcanic lavas and fragmental materials, into which have later been injected dikes, sills, and considerable masses of intrusive rocks, some of which are of acidic types and of granitic texture. These westward islands are bordered both to the north and south by depressions 2,000 fathoms or more in depth, and the islands have apparently been built up from that depth by the ejection and extrusion of volcanic materials since early Tertiary time. No rocks of proved pre-Tertiary age were seen, and the only sedimentary materials present may well have been derived from the erosion of the volcanic islands after they were built up above sea level. On the Alaska Peninsula pre-Tertiary sediments through which the volcanic materials broke to the surface are abundantly present. There is evidence that all the larger islands and the higher portions of the peninsula were severely glaciated during Pleistocene time. Each of the larger islands was the center of ice accumulation and dispersal, and the present topography, except upon recently active volcanic cones, shows strongly the effects of glacial sculpture. Report Alaska Aleutian Islands University of North Texas: UNT Digital Library |
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Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Geology -- Alaska -- Alaska Peninsula Geology -- Alaska -- Aleutian Islands Geology |
spellingShingle |
Geology -- Alaska -- Alaska Peninsula Geology -- Alaska -- Aleutian Islands Geology Capps, Stephen R. Notes on the Geology of the Alaska Peninsula and the Aleutian Islands |
topic_facet |
Geology -- Alaska -- Alaska Peninsula Geology -- Alaska -- Aleutian Islands Geology |
description |
Abstract: During the spring of 1932 an opportunity was offered by the United States Navy for a geologist to accompany an expedition organized to make a reconnaissance of the western part of Alaska Peninsula and the Aleutian Islands. This expedition visited several localities the geology of which was little known. It was found, as had already been expected, that the islands west of Unimak Pass are composed mainly of basic volcanic lavas and fragmental materials, into which have later been injected dikes, sills, and considerable masses of intrusive rocks, some of which are of acidic types and of granitic texture. These westward islands are bordered both to the north and south by depressions 2,000 fathoms or more in depth, and the islands have apparently been built up from that depth by the ejection and extrusion of volcanic materials since early Tertiary time. No rocks of proved pre-Tertiary age were seen, and the only sedimentary materials present may well have been derived from the erosion of the volcanic islands after they were built up above sea level. On the Alaska Peninsula pre-Tertiary sediments through which the volcanic materials broke to the surface are abundantly present. There is evidence that all the larger islands and the higher portions of the peninsula were severely glaciated during Pleistocene time. Each of the larger islands was the center of ice accumulation and dispersal, and the present topography, except upon recently active volcanic cones, shows strongly the effects of glacial sculpture. |
author2 |
Geological Survey (U.S.) |
format |
Report |
author |
Capps, Stephen R. |
author_facet |
Capps, Stephen R. |
author_sort |
Capps, Stephen R. |
title |
Notes on the Geology of the Alaska Peninsula and the Aleutian Islands |
title_short |
Notes on the Geology of the Alaska Peninsula and the Aleutian Islands |
title_full |
Notes on the Geology of the Alaska Peninsula and the Aleutian Islands |
title_fullStr |
Notes on the Geology of the Alaska Peninsula and the Aleutian Islands |
title_full_unstemmed |
Notes on the Geology of the Alaska Peninsula and the Aleutian Islands |
title_sort |
notes on the geology of the alaska peninsula and the aleutian islands |
publisher |
United States. Government Printing Office. |
publishDate |
1934 |
url |
https://digital.library.unt.edu/ark:/67531/metadc304241/ |
op_coverage |
United States - Alaska |
genre |
Alaska Aleutian Islands |
genre_facet |
Alaska Aleutian Islands |
op_source |
Mineral resources of Alaska, 1932; pp. 141-153 |
op_relation |
oclc: 883253278 sudoc: I 19.3:857-D rep-no: USGS Bulletin 857-D https://digital.library.unt.edu/ark:/67531/metadc304241/ ark: ark:/67531/metadc304241 |
_version_ |
1766240879145648128 |