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B-Roll w/narration - Sedge (Cyperaceae) is common in wet lowlands today and was common during the Pleistocene. An example of sedge found in the tunnel carbon-dated at 31,000 years old (Wooller et al. 2007). It is an exceptional specimen because still contains chlorophyll making it green. Chlorophyll is a relatively fragile molecule (think about how long grass clippings stay green in a mulch pile.) In this case, the sedge collapsed into a melting ice wedge in late summer and froze before it could rot. The ice wedge was covered with enough collapsing soil that it never thawed out again—giving us a preserved green specimen.
| Date Taken: | 11.02.2017 |
| Date Posted: | 02.14.2018 08:36 |
| Category: | B-Roll |
| Video ID: | 584577 |
| VIRIN: | 171002-A-ND890-004 |
| Filename: | DOD_105315417 |
| Length: | 00:00:44 |
| Location: | FOX, AK, US |
| Downloads: | 8 |
| High-Res. Downloads: | 8 |
This work, Sedge (Cyperaceae) - Permafrost Tunnel Research Facility, by David Gray, identified by DVIDS, must comply with the restrictions shown on https://www.dvidshub.net/about/copyright.
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