A 12 000 year radiocarbon date of deglaciation from the Continental Divide of northwestern Montana
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Abstract
During the Pinedale (Late Wisconsinan) glaciation, an outlet glacier from a mountain ice field flowed eastward across the Continental Divide through Marias Pass in northwestern Montana. This outlet glacier was the major source of the Two Medicine glacier, a large piedmont glacier that extended from the mountain front east about 55 km onto the plains. An accelerator mass spectrometry radiocarbon age of 12 194 ± 145 BP (AA-9530) was obtained from a wood fragment, underlying a Glacier Peak tephra and a Mount Saint Helens set J tephra in a section of lake sediments, near Marias Pass. This radiocarbon age provides a minimum date of deglaciation for the Marias Pass area that is about 800 years older than a previous estimate. Furthermore, the radiocarbon age indicates that the Two Medicine glacier was no longer being supplied by its major source and if it still existed was only as a dying, stagnant ice mass.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A 12 000 year radiocarbon date of deglaciation from the Continental Divide of northwestern Montana |
| Series title | Canadian Journal of Earth Sciences |
| DOI | 10.1139/e95-106 |
| Volume | 32 |
| Issue | 9 |
| Year Published | 1995 |
| Language | English |
| Publisher | Canadian Science Publishing |
| Contributing office(s) | Geosciences and Environmental Change Science Center |
| Description | 5 p. |
| First page | 1303 |
| Last page | 1307 |
| Country | United States |
| State | Idaho, Montana |
| Other Geospatial | Northwestern Montana |
| Google Analytic Metrics | Metrics page |