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About: Stephen Formation     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Tract108673395, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatCambrianPaleontologicalSitesgeo:SpatialThingyago:GeographicalArea108574314yago:Location100027167yago:Object100002684yago:PhysicalEntity100001930yago:Region108630985yago:YagoGeoEntityyago:YagoLegalActorGeoyago:YagoPermanentlyLocatedEntityorganisationyago:Site108651247yago:Tract108673395 New Facet based on Instances of this Class

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). It is famous for the exceptional preservation of soft-bodied fossils: the Burgess Shale biota. The formation overlies the Cathedral escarpment, a submarine cliff; consequently it is divided into two quite separate parts, the 'thin' sequence deposited in the shallower waters atop the escarpment, and the 'thick' sequence deposited in the deeper waters beyond the cliff. Because the 'thick' Stephen Formation represents a distinct lithofacies, some authors suggest it warrants its own name,