Hosta

Westergaardodina is a species-rich genus of spine, U or W-shaped paraconodont^[3] known from Middle Cambrian to Lower Ordovician strata.^[4]^[5]

Use in stratigraphy

Paibi, a village in Hunan, China, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the boundary between the Miaolingian and Furongian epochs of the Cambrian Period on the geologic time scale. The GSSP was ratified by the International Union of Geological Sciences in late 2003. It established the first formally agreed upon subdivision of the Cambrian. Markers which occur near the boundary include the first appearance of Westergaardodina proligula and the Steptoean positive carbon isotope excursion, a large positive shift in carbon-13 isotopes.^[6]^[7]

^ Kambrische Conodonten. Klaus J. Müller, Zeitschrift der Deutschen Geologischen Gesellschaft Band 111 (1959), pages 434-485
^ Upper Furongian (Cambrian) conodonts from the Degerhamn quarry road section, southern Öland, Sweden. Bagnoli G and Stouge S, 2014, GFF, doi:10.1080/11035897.2013.858768
^ Murdock, Duncan J. E.; Dong, Xi-Ping; Repetski, John E.; Marone, Federica; Stampanoni, Marco; Donoghue, Philip C. J. (2013-10-24). "Descriptive terminology of paraconodont and euconodont elements. : The origin of conodonts and of vertebrate mineralized skeletons : Nature : Nature Publishing Group". Nature. 502 (7472): 546–549. doi:10.1038/nature12645. PMID 24132236. S2CID 4455633.
^ Xiping, D.; Repetski, J. E.; Bergström, S. M. (2004). "Conodont Biostratigraphy of the Middle Cambrian through Lowermost Ordovician in Hunan, South China". Acta Geologica Sinica - English Edition. 78 (6): 1185. doi:10.1111/j.1755-6724.2004.tb00776.x.
^ Muller, K.J.; Hinz, I (1991). Upper Cambrian Conodonts from Sweden. Fossils and Strata. Vol. 28. Oslo: Universitetsforlaget. pp. 1–153. ISBN 978-82-00-37475-6.
^ "Proposed Global Standard Stratotype-Section and Point for the Paibian Stage and Furongian Series (Upper Cambrian)". Retrieved 2006-06-30.
^ "Another "Golden Spike" in China". International Union of Geological Sciences. 28 November 2003. Archived from the original on November 15, 2004. Retrieved 2006-06-30.