Julie Brigham-Grette
Biographic Data
| ID | 5600033 |
|---|---|
| NAME | Julie Brigham-Grette |
| GIVEN NAMES | Julie |
| FAMILY NAME | Brigham-Grette |
| SIGNATURE | BRIGHAM-GRETTE J |
| VERIFIED | No |
| TOTAL WORKS | 13 |
| TOTAL CITATIONS | 0 |
| WORKS AS AUTHOR | 13 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1989 |
| LATEST PUBLICATION YEAR | 2007 |
| H-INDEX | 0 |
New evidence for high discharge to the Chukchi shelf since the Last Glacial Maximum
Using CHIRP subbottom profiling across the Chukchi shelf, offshore NW Alaska, we observed a large incised valley that measures tens of kilometers in width. The valley appears to have been repeatedly excavated during sea level lowering; however, the two most recent incisions appear to have been downcut during the last sea level rise, suggesting an increase in the volume of discharge. Modern drainage from the northwestern Alaskan margin is dominate…
Glenn A. Goodfriend
Dr. Geoffrey Owen Seltzer
Pleistocene raised marine deposits on Wrangel Island, northeast Siberia and implications for the presence of an East Siberian ice sheet
Two previously undocumented Pleistocene marine transgressions on Wrangel Island, northeastern Siberia, question the presence of an East Siberian or Beringian ice sheet during the last glacial maximum (LGM). The Tundrovayan Transgression (459,000–780,000 yr B.P.) is represented by raised marine deposits and landforms 15–41 m asl located up to 18 km inland. The presence of high sea level 64,000–73,000 yr ago (the Krasny Flagian Transgression) is pr…
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet
The Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia. Twelve new cosmogenic isotope ages and 14 new radiocarbon ages in concert with morphometric analyses and terrace stratigraphy constrain the timing of glaciation in this region of central Chukotka. The Sartan Glaciation (Last Glacial Maximum) was limited in extent in the Pekulney Mountains and dates to ∼…
Quaternary Community Loses Glenn Goodfriend
As scientists we each enjoy the genuine sense of discovery that comes from our daily work on earth systems and earth history. For most of us, our love of fieldwork is complemented by selfless hours of laboratory work and the camaraderie and inspiration that comes from collaborations with colleagues. The outgrowths of this process are the enduring publications that pass on our knowledge to others. On October 15, 2002, just before the national Geol…
The Age and Origin of the Little Diomede Island Upland Surface
Geomorphology and projected uplift rates indicate that the upland surface of Little Diomede Island may represent a high sea level stand that occurred 2.6 million years ago in the Bering Strait. The 350-363 m upland surface of the island could be correlative with the York terrace, an uplifted marine terrace previously recognized on the southern flanks of the York Mountains, Seward Peninsula. The modern surface of Little Diomede Island is composed …
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells
Aspartic acid (Asp) racemization occurs at a significantly higher rate than isoleucine epimerization and consequently provides better temporal resolution of Arctic marine deposits (from Alaska, Spitsbergen, and Baffin Island). Heating experiments (at 100°C) on the bivalves Mya and Hiatella show the Asp racemization rate decreases with increasing D/L values, as is typical for biogenic carbonates. Based on these experimental racemization rates and …
Emergent Marine Record and Paleoclimate of the Last Interglaciation along the Northwest Alaskan Coast
The last interglacial high sea-level stand, the Pelukian transgression of isotope substage 5e, is recorded along the western and northern coasts of Alaska by discontinuous but clearly traceable marine terraces and coastal landforms up to about 10 m altitude. The stratigraphy indicates that sea level reached this altitude only once during the last interglacial cycle. From the type area at Nome, to St. Lawrence Island in the Bering Sea, to the east…
Middle Pleistocene age of the Nome River glaciation, northwestern Alaska
During the middle Pleistocene Nome River glaciation of northwestern Alaska, glaciers covered an area an order of magnitude more extensive than during any subsequent glacial intervals. The age of the Nome River glaciation is constrained by laser-fusion 40 Ar/ 39 Ar analyses of basaltic lava that overlies Nome River drift at Minnie Creek, central Seward Peninsula, that average 470,000 ± 190,000 yr (±1σ). Milligram-size subsamples of the lava were d…
The last interglaciation in Alaska
Circum-Arctic Late Tertiary/Early Pleistocene Stratigraphy And Environments - A Preface
During the 1980s the Geological Survey of Canada (GSC) and the U.S. Geological Survey (USGS) initiated a program of joint workshops and cooperative field excursions. The first meeting took place in Calgary, Alberta, in 1984. It dealt with correlation of Quaternary deposits in northwestern North America, but touched on the Tertiary. A second GSC/USGS workshop in early 1987 concerned the Quaternary history of interior basins of Alaska and Canada, b…
Amino acid geochronology
No prominent works on this page.
Amino acid geochronology
Circum-Arctic Late Tertiary/Early Pleistocene Stratigraphy And Environments - A Preface
During the 1980s the Geological Survey of Canada (GSC) and the U.S. Geological Survey (USGS) initiated a program of joint workshops and cooperative field excursions. The first meeting took place in Calgary, Alberta, in 1984. It dealt with correlation of Quaternary deposits in northwestern North America, but touched on the Tertiary. A second GSC/USGS workshop in early 1987 concerned the Quaternary history of interior basins of Alaska and Canada, b…
Middle Pleistocene age of the Nome River glaciation, northwestern Alaska
During the middle Pleistocene Nome River glaciation of northwestern Alaska, glaciers covered an area an order of magnitude more extensive than during any subsequent glacial intervals. The age of the Nome River glaciation is constrained by laser-fusion 40 Ar/ 39 Ar analyses of basaltic lava that overlies Nome River drift at Minnie Creek, central Seward Peninsula, that average 470,000 ± 190,000 yr (±1σ). Milligram-size subsamples of the lava were d…
The last interglaciation in Alaska
Emergent Marine Record and Paleoclimate of the Last Interglaciation along the Northwest Alaskan Coast
The last interglacial high sea-level stand, the Pelukian transgression of isotope substage 5e, is recorded along the western and northern coasts of Alaska by discontinuous but clearly traceable marine terraces and coastal landforms up to about 10 m altitude. The stratigraphy indicates that sea level reached this altitude only once during the last interglacial cycle. From the type area at Nome, to St. Lawrence Island in the Bering Sea, to the east…
Enhanced Age Resolution of the Marine Quaternary Record in the Arctic Using Aspartic Acid Racemization Dating of Bivalve Shells
Aspartic acid (Asp) racemization occurs at a significantly higher rate than isoleucine epimerization and consequently provides better temporal resolution of Arctic marine deposits (from Alaska, Spitsbergen, and Baffin Island). Heating experiments (at 100°C) on the bivalves Mya and Hiatella show the Asp racemization rate decreases with increasing D/L values, as is typical for biogenic carbonates. Based on these experimental racemization rates and …
The Age and Origin of the Little Diomede Island Upland Surface
Geomorphology and projected uplift rates indicate that the upland surface of Little Diomede Island may represent a high sea level stand that occurred 2.6 million years ago in the Bering Strait. The 350-363 m upland surface of the island could be correlative with the York terrace, an uplifted marine terrace previously recognized on the southern flanks of the York Mountains, Seward Peninsula. The modern surface of Little Diomede Island is composed …
Quaternary Community Loses Glenn Goodfriend
As scientists we each enjoy the genuine sense of discovery that comes from our daily work on earth systems and earth history. For most of us, our love of fieldwork is complemented by selfless hours of laboratory work and the camaraderie and inspiration that comes from collaborations with colleagues. The outgrowths of this process are the enduring publications that pass on our knowledge to others. On October 15, 2002, just before the national Geol…
Pleistocene raised marine deposits on Wrangel Island, northeast Siberia and implications for the presence of an East Siberian ice sheet
Two previously undocumented Pleistocene marine transgressions on Wrangel Island, northeastern Siberia, question the presence of an East Siberian or Beringian ice sheet during the last glacial maximum (LGM). The Tundrovayan Transgression (459,000–780,000 yr B.P.) is represented by raised marine deposits and landforms 15–41 m asl located up to 18 km inland. The presence of high sea level 64,000–73,000 yr ago (the Krasny Flagian Transgression) is pr…
Chlorine-36 and 14 C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet
The Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia. Twelve new cosmogenic isotope ages and 14 new radiocarbon ages in concert with morphometric analyses and terrace stratigraphy constrain the timing of glaciation in this region of central Chukotka. The Sartan Glaciation (Last Glacial Maximum) was limited in extent in the Pekulney Mountains and dates to ∼…
Glenn A. Goodfriend
Dr. Geoffrey Owen Seltzer
New evidence for high discharge to the Chukchi shelf since the Last Glacial Maximum
Using CHIRP subbottom profiling across the Chukchi shelf, offshore NW Alaska, we observed a large incised valley that measures tens of kilometers in width. The valley appears to have been repeatedly excavated during sea level lowering; however, the two most recent incisions appear to have been downcut during the last sea level rise, suggesting an increase in the volume of discharge. Modern drainage from the northwestern Alaskan margin is dominate…
Geology and Paleoclimatology Research (10 works) · Geology (8 works) · Methane Hydrates and Related Phenomena (7 works) · Paleontology (7 works) · Pleistocene (7 works) · Glacial period (6 works) · Oceanography (6 works) · Geography (5 works) · Paleontology (5 works) · Radiocarbon dating (5 works)