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About: Trilobite zone     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.org associated with source document(s)

Type: yago:WikicatTrilobitesyago:Animal100015388yago:Arthropod101767661yago:Invertebrate101905661yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930yago:Trilobite101768244yago:Whole100003553 New Facet based on Instances of this Class

Trilobites are used as index fossils to subdivide the Cambrian period. Assemblages of trilobites define trilobite zones. The Olenellus-zone has traditionally marked the top of the Lower Cambrian, and is followed by the zone. The last two zones of the Middle Cambrian are the Bathyuriscus–Elrathina-zone (contemporaneous with the Burgess Shale) and the subsequent -zone (starting at the base of the Drumian stage). These are overlain by the lowermost Upper Cambrian Cedaria-zone. The lower Middle Cambrian -zone (Spence Shale) is above the -zone. The -zone is upper Cambrian.