Alaska's Arctic Petrified Forest; A Geologic Oddity
Within the arctic of far western Alaska there are petrified remains of an ancient forest. These fossils were ejected upwards as part of a tremendous volcanic explosion, the same one which formed a 5-mile-wide maar crater in the ground. Yet, these fossils did not originate tens of millions of years ago, but rather during a period a mere 130,000 years ago when the Seward Peninsula of Alaska was densely forested. This video will explain how these fossils came to be, and how they relate to Milankovitch Cycles.
Thumbnail Photo Credit: Orr, Tim, Alaska Volcano Observatory / U.S. Geological Survey, https://avo.alaska.edu/image/view/178401. This image was cropped, resized, overlaid with text, and overlaid with GeologyHub made graphics (the image border & the GeologyHub logo).
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Sources/Citations:
[1] U.S. Geological Survey
[2] Alaska Volcano Observatory
[3] National Parks Service
[4] Glen Fergus, 2015, Article link: http://gergs.net/all_palaeotemps/, Photo link: https://i0.wp.com/gergs.net/wp-conten..., CC BY 4.0
[5] April S. Dalton, Chris R. Stokes, Christine L. Batchelor, Evolution of the Laurentide and Innuitian ice sheets prior to the Last Glacial Maximum (115 ka to 25 ka), Earth-Science Reviews, Volume 224, 2022, 103875, ISSN 0012-8252, https://doi.org/10.1016/j.earscirev.2.... (https://www.sciencedirect.com/science..., CC BY 4.0.
[6] Sommers, A. N., Otto-Bliesner, B. L., Lipscomb, W. H., Lofverstrom, M., Shafer, S. L., Bartlein, P. J., et al. (2021). Retreat and regrowth of the Greenland Ice Sheet during the Last Interglacial as simulated by the CESM2-CISM2 coupled climate–ice sheet model. Paleoceanography and Paleoclimatology, 36, e2021PA004272. https://doi.org/10.1029/2021PA004272, CC BY 4.0.
0:00 Alaskan Volcanic Explosion
1:24 Petrified Wood
2:03 Pleistocene Period
3:40 Milankovitch Cycles