"Alaskan tracks belong to herd of duck-billed dinosaurs" Topic
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Tango01 | 07 Jul 2014 9:39 p.m. PST |
"A trove of fossilized footprints found in Alaska's Denali National Park and Preserve in 2007 is providing a wealth of information about dinosaur behavior, researchers say. The thousands of impressions, created on a 180-meter-long portion of near-coastal flood plain, today pepper a steep mountainside. Most of the tracks, made somewhere between 69 million and 72 million years ago, were left by hadrosaurs, commonly known as duck-billed dinosaurs (the crested creatures in this artist's representation). The consistent and excellent preservation of tracks suggests all the footprints were created within a short time period. Varying in width from 8 to 64 centimeters, the footprints cluster within four distinct size ranges, which researchers suggest represent specific age groups within a multigenerational herd
" Full article here link Amicalement Armand |
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