Burgess shale dating
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This is an Inside Science story. Inside Science -- A new trove of outstandingly preserved fossils in China from the dawn of animal life rivals the horde of weird creatures found in legendary sites such as the Burgess Shale, and may shed light on many puzzles concerning the animal family tree, a new study finds. The earliest hints of life in the roughly 4. However, about million years ago, early in the Cambrian period, the simple animal life that already existed exploded in complexity and diversity. During this outburst, known as the Cambrian explosion, all the major groups of animals seemed to appear rapidly.
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Rarest of All - The Burgess Shale Fossils
Burgess Shale and similar rockunits | rocketcat.info
It is famous for its preservation of soft body parts in several different types of early arthropods and other invertebrates. The Burgess Shale is part of the Stephen Formation, a Middle Cambrian-age rock unit dating back to about million years of age. Although it was originally believed that the Burgess Shale was deposited in anoxic conditions, which was thought to explain the quality of fossil preservation, but there is growing evidence that oxygen was abundant in the area's water. Paleontologist Charles Walcott first discovered the Burgess Shale in , and by he had collected over 65, specimens from the locality. The fossils were not seen as particularly unusual until the s, when it became clear that most were not part of any extant group of animals.
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Fossils of the Burgess Shale
Field, British Columbia is the closest town to the Walcott quarry. Shaded areas are Canadian national parks. Source: Parks Canada This article from was missing from our archive so we uploaded an updated version. We liked it so much we thought you might enjoy the chance to read it, for the first time, online. The Middle Cambrian world million years ago was dominated by several large, barren landmasses and one ocean.
Canada is home to Burgess Shale: an expansive fossil field that contains a diverse array of preserved organisms dating all the way back to the Middle Cambrian, million years ago. There are two well-known sites: one in the Yoho National Park and another 42 km 26 miles away at Kootenay National Park. Another site has been discovered in Kootenay and could be the richest fossil site ever discovered.