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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.
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 conventional, exceptionally preserved fossils of the Burgess Shale are supplemented by the shells of organisms which lived on, and burrowed into, the sediment before the exceptional preservation pathway was complete. The organisms' presence shows that oxygen was present, but at worst this "paused" the mineralisation process. [7]
The soft tissues of the mid-Cambrian hyolith Haplophrentis, from the Burgess Shale and Spence Shale Lagerstätten include a gullwing-shaped band below the operculum. This band is interpreted as a lophophore, a feeding organ with a central mouth; it bears 12 to 16 tentacles.
The tallest sponge of the Burgess Shale, Its name is derived from the Greek lept ("slender") and mitos ("thread"), referring to the overall shape of the sponge. Petaloptyon: Hexactinellida: Walcott Quarry; Trilobite Beds; Tulip Beds; A goblet-shaped hexactinellid sponge known from rare fragments from the Burgess Shale. The fragments show the ...
The Burgess Shale, a series of fossil beds in the Canadian Rockies, was first noticed in 1886 by Richard McConnell of the Geological Survey of Canada (GSC).His and subsequent finds, all from the Mount Stephen area, came to the attention of palaeontologist Charles Doolittle Walcott, who in 1907 found time to reconnoitre the area.
Canadia is a Burgess Shale fossil that is widely agreed to be a polychaete. [ 6 ] [ 33 ] Halkieria evangelista , which Conway Morris had found in Greenland's Sirius Passet lagerstätte , was a "sister" group" to brachiopods , animals whose modern forms have bivalve shells but differ from molluscs in having muscular stalks and a distinctive ...
Orthrozanclus′ sclerites are very similar to those of its Burgess Shale contemporary Wiwaxia. [5] Its shell is very similar to: one of the two Burgess Shale shell types labelled Oikozetetes; the forward shell of Halkieriids, most of which are dated to the Early Cambrian; and those of other Early Cambrian fossils such as Ocruranus and Eohalobia.