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A Burgess Shale trilobite showing soft-part preservation. Burgess Shale-type deposits occur either on the continental slope or in a sedimentary basin.They are known in sediments deposited at all water depths during the Precambrian (Riphean stage onwards), with a notable gap in the last 150 million years of the Proterozoic. [6]
The Burgess Shale is a series of sediment deposits spread over a vertical distance of hundreds of metres, extending laterally for at least 50 kilometres (30 mi). [18] The deposits were originally laid down on the floor of a shallow sea; during the Late Cretaceous Laramide orogeny, mountain-building processes squeezed the sediments upwards to their current position at around 2,500 metres (8,000 ...
The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of British Columbia, Canada. [ 2 ] [ 3 ] It is famous for the exceptional preservation of the soft parts of its fossils. At 508 million years old ( middle Cambrian ), [ 4 ] it is one of the earliest fossil beds containing soft-part imprints.
In the far, far older Burgess Shale event, some of the oldest organisms ever found were preserved intact because they likely fell into a mudslide and were killed instantly.
The Burgess Shale is a fossil-bearing deposit exposed in the Canadian Rockies of ... evidenced by the frequent presence of sediments preserved in its gut. Louisella:
The earliest Burgess Shale-type biota to be described, being documneted 25 years before the Burgess Shale itself. [47] Kaili Formation. 513–501 Ma Guizhou, China The middle part of the Kaili Formation, the Oryctocephalus indicus Zone, contains a Burgess Shale-type lagerstätte with many well-preserved fossils known collectively as the Kaili ...
The Stephen Formation is a geologic formation exposed in the Canadian Rockies of British Columbia and Alberta, on the western edge of the Western Canada Sedimentary Basin.It consists of shale, thin-bedded limestone, and siltstone that was deposited during Middle Cambrian time (513 to 497 million years ago). [5]
Many of the sponges have affinities with Cambrian taxa common in Burgess Shale-type faunas. [8] Though at least 27 sponge species have been recorded in the biota, nearly all occurrences are monospecific death assemblages, with the exception of Pirania auraeum , which has a broader and less dense distribution in the formation.