George H Denton
Biographic Data
| ID | 6370367 |
|---|---|
| NAME | George H Denton |
| GIVEN NAMES | George H |
| FAMILY NAME | Denton |
| SIGNATURE | DENTON G H |
| AFFILIATIONS | University of Maine |
| VERIFIED | No |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 0 |
| AUTHOR COUNT | 13 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1964 |
| LATEST PUBLICATION YEAR | 2002 |
| H-INDEX | 0 |
Holocene history of the Wilson Piedmont Glacier along the southern Scott Coast, Antarctica
Geometric and cross-cutting relationships between the Wilson Piedmont Glacier and raised beach ridges indicate that the glacier margin has undergone Holocene ‘ uctuations. During mid-Holocene time, the Wilson Piedmont Glacier retreated to a position less extensive than at present. A subsequent readvance culmi nated less than 250 years ago. Since ad 1956, the glacier and adjacent large snow ramps have retreated up to 600 m in some locations. Large…
Climate, vegetation and glacier fluctuations in Chile, between 40°30′ and 42°30′s latitude — A short review of preliminary results
Chronology of Taylor Glacier Advances in Arena Valley, Antarctica, Using in Situ Cosmogenic 3 He and 10 Be
In situ produced cosmogenic nuclides provide a new technique for constraining exposure ages of glacial deposits. In situ 3 He and 10 Be in quartz sandstone boulders from Arena Valley, southern Victoria Land, Antarctica, provide chronological constraints for a sequence of moraines ("Taylor II-IVb" moraines) related to expansions of Taylor Glacier and the East Antarctic Ice Sheet. Mean 3 He ages are 113,000 ± 45,000 yr, 208,000 ± 67,000 yr, 335,000…
Late Wisconsin and Early Holocene Glacial History, Inner Ross Embayment, Antarctica
Lateral drift sheets of outlet glaciers that pass through the Transantarctic Mountains constrain past changes of the huge Ross ice drainage system of the Antarctic Ice Sheet. Drift stratigraphy suggests correlation of Reedy III (Reedy Glacier), Beardmore (Beardmore Glacier), Britannia (Hatherton/Darwin Glaciers), Ross Sea (McMurdo Sound), and “younger” (Terra Nova Bay) drifts; radiocarbon dates place the outer limits of Ross Sea drift in late Wis…
Late Quaternary Ice-Surface Fluctuations of Beardmore Glacier, Transantarctic Mountains
Former longitudinal profiles of Beardmore Glacier, an outlet through the Transantarctic Mountains, constrain polar plateau elevations near the center of Antarctica and ice-shelf grouding in the southern Ross Embayment. Three gravel drift sheets of late Quaternary age occur alongside Beardmore Glacier. Plunket drift, the youngest, is parallel to and 7–30 m above the present ice surface. The upper limit of Beardmore drift, intermediate in age, is w…
Late Quaternary Ice-Surface Fluctuations of Hatherton Glacier, Transantarctic Mountains
Former longitudinal profiles of Hatherton Glacier, an outlet through the Transantarctic Mountains, constrain nearby polar plateau elevations and ice-shelf grounding in the southwestern Ross Embayment. Four gravel drift sheets of late Quaternary age beside Hatherton Glacier are, from youngest to oldest, Hatherton, Britannia I, Britannia II, and Danum. The Hatherton drift limit is uniformly 20 to 70 m above the present ice surface. The Britannia II…
Global Ice-Sheet System Interlocked by Sea Level
Denton and Hughes (1983, Quaternary Research 20, 125–144) postulated that sea level linked a global ice-sheet system with both terrestrial and grounded marine components during late Quaternary ice ages. Summer temperature changes near Northern Hemisphere melting margins initiated sea-level fluctuations that controlled marine components in both polar hemispheres. It was further proposed that variations of this ice-sheet system amplified and transm…
The Last Interglacial Ocean
The final effort of the CLIMAP project was a study of the last interglaciation, a time of minimum ice volume some 122,000 yr ago coincident with the Substage 5e oxygen isotopic minimum. Based on detailed oxygen isotope analyses and biotic census counts in 52 cores across the world ocean, last interglacial sea-surface temperatures (SST) were compared with those today. There are small SST departures in the mid-latitude North Atlantic (warmer) and t…
Milankovitch Theory of Ice Ages
J. D. Hays, J. Imbrie, and N. J. Shackleton (1976, Science 194, 1121–1132) showed that the astronomical theory explained many features of late Quaternary ice-age climates, but they did not specify the physical mechanisms involved. Here it is proposed that interlocked variations of ice-sheet heat sinks in both polar hemispheres amplified and transmitted Milankovitch summer half-year insolation changes (a version of the astronomical theory) between…
The Last Great Ice Sheets
Holocene Glacial and Tree-Line Variations in the White River Valley and Skolai Pass, Alaska and Yukon Territory
Complex glacier and tree-line fluctuations in the White River valley on the northern flank of the St. Elias and Wrangell Mountains in southern Alaska and Yukon Territory are recognized by detailed moraine maps and drift stratigraphy, and are dated by dendrochronology, lichenometry, 14 C ages, and stratigraphic relations of drift to the eastern (1230 14 C yr BP) and northern (1980 14 C yr BP) lobes of the White River Ash. The results show two majo…
Holocene Climatic Variations—Their Pattern and Possible Cause
In the northeastern St. Elias Mountains in southern Yukon Territory and Alaska, C 14 -dated fluctuations of 14 glacier termini show two major intervals of Holocene glacier expansion, the older dating from 3300-2400 calendar yr BP and the younger corresponding to the Little Ice Age of the last several centuries. Both were about equivalent in magnitude. In addition, a less-extensive and short-lived advance occurred about 1250-1050 calendar yr BP (A…
Age of a Widespread Layer of Volcanic Ash in the Southwestern Yukon Territory
Radiocarbon dates pertaining to a widespread layer of volcanic ash in the southwestern Yukon Territory are here reported. The volcanic ash generally occurs in lacustrine sediments and in peat and loess deposited during the Little Ice Age and thus affords a valuable marker horizon for correlating these deposits. ... Bostock ... constructed an isopach map showing two coalescing fans of ash with a combined area of about 129,000 sq. mi. and a maximum…
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Age of a Widespread Layer of Volcanic Ash in the Southwestern Yukon Territory
Radiocarbon dates pertaining to a widespread layer of volcanic ash in the southwestern Yukon Territory are here reported. The volcanic ash generally occurs in lacustrine sediments and in peat and loess deposited during the Little Ice Age and thus affords a valuable marker horizon for correlating these deposits. ... Bostock ... constructed an isopach map showing two coalescing fans of ash with a combined area of about 129,000 sq. mi. and a maximum…
Holocene Climatic Variations—Their Pattern and Possible Cause
In the northeastern St. Elias Mountains in southern Yukon Territory and Alaska, C 14 -dated fluctuations of 14 glacier termini show two major intervals of Holocene glacier expansion, the older dating from 3300-2400 calendar yr BP and the younger corresponding to the Little Ice Age of the last several centuries. Both were about equivalent in magnitude. In addition, a less-extensive and short-lived advance occurred about 1250-1050 calendar yr BP (A…
Holocene Glacial and Tree-Line Variations in the White River Valley and Skolai Pass, Alaska and Yukon Territory
Complex glacier and tree-line fluctuations in the White River valley on the northern flank of the St. Elias and Wrangell Mountains in southern Alaska and Yukon Territory are recognized by detailed moraine maps and drift stratigraphy, and are dated by dendrochronology, lichenometry, 14 C ages, and stratigraphic relations of drift to the eastern (1230 14 C yr BP) and northern (1980 14 C yr BP) lobes of the White River Ash. The results show two majo…
The Last Great Ice Sheets
Milankovitch Theory of Ice Ages
J. D. Hays, J. Imbrie, and N. J. Shackleton (1976, Science 194, 1121–1132) showed that the astronomical theory explained many features of late Quaternary ice-age climates, but they did not specify the physical mechanisms involved. Here it is proposed that interlocked variations of ice-sheet heat sinks in both polar hemispheres amplified and transmitted Milankovitch summer half-year insolation changes (a version of the astronomical theory) between…
The Last Interglacial Ocean
The final effort of the CLIMAP project was a study of the last interglaciation, a time of minimum ice volume some 122,000 yr ago coincident with the Substage 5e oxygen isotopic minimum. Based on detailed oxygen isotope analyses and biotic census counts in 52 cores across the world ocean, last interglacial sea-surface temperatures (SST) were compared with those today. There are small SST departures in the mid-latitude North Atlantic (warmer) and t…
Global Ice-Sheet System Interlocked by Sea Level
Denton and Hughes (1983, Quaternary Research 20, 125–144) postulated that sea level linked a global ice-sheet system with both terrestrial and grounded marine components during late Quaternary ice ages. Summer temperature changes near Northern Hemisphere melting margins initiated sea-level fluctuations that controlled marine components in both polar hemispheres. It was further proposed that variations of this ice-sheet system amplified and transm…
Late Wisconsin and Early Holocene Glacial History, Inner Ross Embayment, Antarctica
Lateral drift sheets of outlet glaciers that pass through the Transantarctic Mountains constrain past changes of the huge Ross ice drainage system of the Antarctic Ice Sheet. Drift stratigraphy suggests correlation of Reedy III (Reedy Glacier), Beardmore (Beardmore Glacier), Britannia (Hatherton/Darwin Glaciers), Ross Sea (McMurdo Sound), and “younger” (Terra Nova Bay) drifts; radiocarbon dates place the outer limits of Ross Sea drift in late Wis…
Late Quaternary Ice-Surface Fluctuations of Beardmore Glacier, Transantarctic Mountains
Former longitudinal profiles of Beardmore Glacier, an outlet through the Transantarctic Mountains, constrain polar plateau elevations near the center of Antarctica and ice-shelf grouding in the southern Ross Embayment. Three gravel drift sheets of late Quaternary age occur alongside Beardmore Glacier. Plunket drift, the youngest, is parallel to and 7–30 m above the present ice surface. The upper limit of Beardmore drift, intermediate in age, is w…
Late Quaternary Ice-Surface Fluctuations of Hatherton Glacier, Transantarctic Mountains
Former longitudinal profiles of Hatherton Glacier, an outlet through the Transantarctic Mountains, constrain nearby polar plateau elevations and ice-shelf grounding in the southwestern Ross Embayment. Four gravel drift sheets of late Quaternary age beside Hatherton Glacier are, from youngest to oldest, Hatherton, Britannia I, Britannia II, and Danum. The Hatherton drift limit is uniformly 20 to 70 m above the present ice surface. The Britannia II…
Chronology of Taylor Glacier Advances in Arena Valley, Antarctica, Using in Situ Cosmogenic 3 He and 10 Be
In situ produced cosmogenic nuclides provide a new technique for constraining exposure ages of glacial deposits. In situ 3 He and 10 Be in quartz sandstone boulders from Arena Valley, southern Victoria Land, Antarctica, provide chronological constraints for a sequence of moraines ("Taylor II-IVb" moraines) related to expansions of Taylor Glacier and the East Antarctic Ice Sheet. Mean 3 He ages are 113,000 ± 45,000 yr, 208,000 ± 67,000 yr, 335,000…
Climate, vegetation and glacier fluctuations in Chile, between 40°30′ and 42°30′s latitude — A short review of preliminary results
Holocene history of the Wilson Piedmont Glacier along the southern Scott Coast, Antarctica
Geometric and cross-cutting relationships between the Wilson Piedmont Glacier and raised beach ridges indicate that the glacier margin has undergone Holocene ‘ uctuations. During mid-Holocene time, the Wilson Piedmont Glacier retreated to a position less extensive than at present. A subsequent readvance culmi nated less than 250 years ago. Since ad 1956, the glacier and adjacent large snow ramps have retreated up to 600 m in some locations. Large…
Geology and Paleoclimatology Research (13 works) · Cryospheric studies and observations (10 works) · Geology (10 works) · Paleontology (10 works) · Glacier (9 works) · Geomorphology (7 works) · Physical geography (7 works) · Sea ice (7 works) · Climatology (6 works) · Cryosphere (6 works)