File:Lommel in northern Belgium, at 12.94 ka, a large late Glacial sand ridge.jpg
Lommel_in_northern_Belgium,_at_12.94_ka,_a_large_late_Glacial_sand_ridge.jpg (600 × 487 pixels, file size: 66 KB, MIME type: image/jpeg)
Summary[edit | edit source]
| Description |
Lommel in northern Belgium, near the border with the Netherlands, at 12.94 ka, was a large late Glacial sand ridge covered by open forest at the northern edge of a marsh. |
|---|---|
| Source |
The image appears on a website entitled, "Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling" at https://www.pnas.org/content/104/41/16016.full. |
| Date |
March 13, 2007 |
| Author |
R. B. Firestone, A. West, J. P. Kennett, L. Becker, T. E. Bunch, Z. S. Revay, P. H. Schultz, T. Belgya, D. J. Kennett, J. M. Erlandson, O. J. Dickenson, A. C. Goodyear, R. S. Harris, G. A. Howard, J. B. Kloosterman, P. Lechler, P. A. Mayewski, J. Montgomery, R. Poreda, T. Darrah, S. S. Que Hee, A. R. Smith, A. Stich, W. Topping, J. H. Wittke, and W. S. Wolbach |
| Rationale |
No free licensed or public domain alternatives known to exist to show the Lommel stratigraphic cross section depictinh that throughout the Bölling-Allerod, eolian sediments known as the Coversands blanketed the Lommel area; then, just before the Younger Dryas began, a thin layer of bleached sand was deposited and, in turn, was covered by the dark layer marked "YDB" above; that stratum is called the Usselo Horizon and is composed of fine to medium quartz sands rich in charcoal; the dark Usselo Horizon is stratigraphically equivalent to the YDB layer and contains a similar assemblage of impact markers (magnetic grains, magnetic microspherules, iridium, charcoal, and glass-like carbon). |
| Permission |
Fair Use, site restriction. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:49, 23 April 2019 | | 600 × 487 (66 KB) | Marshallsumter (discuss | contribs) | {{Information1 |Description = Lommel in northern Belgium, near the border with the Netherlands, at 12.94 ka, was a large late Glacial sand ridge covered by open forest at the northern edge of a marsh. |Source = The image appears on a website entitled, "Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling" at https://www.pnas.org/content/104/41/16016.full. |Date = March 13, 2007 |Author = R. B. Firestone, A. West,... |
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