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Chapter 27 Cambrian–Ordovician cephalopod palaeogeography and diversity | Geological Society, London, Memoirs
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Trilobite biostratigraphy of the Cambrian 5 and Drumian stages, Series 3 (Laurentian Delamaran, Topazan, and Marjuman stages, Lincolnian Series) of the lower Emigrant Formation at Clayton Ridge, Esmeralda County, Nevada | Journal
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Chapter 27 Cambrian–Ordovician cephalopod palaeogeography and diversity | Geological Society, London, Memoirs
![Trilobite biostratigraphy of the Cambrian 5 and Drumian stages, Series 3 (Laurentian Delamaran, Topazan, and Marjuman stages, Lincolnian Series) of the lower Emigrant Formation at Clayton Ridge, Esmeralda County, Nevada | Journal Trilobite biostratigraphy of the Cambrian 5 and Drumian stages, Series 3 (Laurentian Delamaran, Topazan, and Marjuman stages, Lincolnian Series) of the lower Emigrant Formation at Clayton Ridge, Esmeralda County, Nevada | Journal](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20180522103551194-0861:S0022336017001305:S0022336017001305_fig9g.jpeg?pub-status=live)