Trilobite zone
http://dbpedia.org/resource/Trilobite_zone an entity of type: WikicatTrilobites
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.
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Trilobite zone
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27228474
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1099122715
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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. Alternative zoning names place the Burgess Shale in the Peronopsis bonnerensis-zone, which is underlain by the Oryctocephalus indicus-zone (e.g. Spence Shale) and overlain (perhaps not directly) by the Ptychagnostus punctuosus-zone. The lower Middle Cambrian -zone (Spence Shale) is above the -zone. The -zone is upper Cambrian.
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11913