Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada
New brachiopod materials from the lower Cambrian (Global Stage 3 and lower Stage 4) of Esmeralda County, Nevada are described and their age distribution and diversity is discussed. The specimens originate from the Fritzaspis, “Fallotaspis”, “Nevadella” and Bonnia-Olenellus biozone which in the area...
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Uppsala universitet, Institutionen för geovetenskaper
2017
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ftuppsalauniv:oai:DiVA.org:uu-329678 2023-05-15T16:31:50+02:00 Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada Laurentias äldsta brachiopoder: Lägre Kambrium brachiopoder från Montezumabergskedjan, Nevada Saxén, Sara 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-329678 eng eng Uppsala universitet, Institutionen för geovetenskaper Examensarbete vid Institutionen för geovetenskaper, 1650-6553 409 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-329678 info:eu-repo/semantics/openAccess lower Cambrian Begadean Waucoban Laurentia brachiopod Nevada lägre Kambrium Natural Sciences Naturvetenskap Student thesis info:eu-repo/semantics/bachelorThesis text 2017 ftuppsalauniv 2023-02-23T21:59:09Z New brachiopod materials from the lower Cambrian (Global Stage 3 and lower Stage 4) of Esmeralda County, Nevada are described and their age distribution and diversity is discussed. The specimens originate from the Fritzaspis, “Fallotaspis”, “Nevadella” and Bonnia-Olenellus biozone which in the area correspond to the Campito Formation and the overlying Poleta Formation. As the specimens from the Gold Coin Member (Begadean Series) and the Montenegro Member (Waucoban Series) of the Campito Formation encompass the oldest samples, they were therefore prioritised as there was not enough time to describe all the specimens. The oldest known trilobites from Laurentia have previously been reported from the Gold Coin Member and it is of interest to determine if the brachiopods from the same member also are the oldest known from Laurentia.As many specimens are poorly preserved, especially the ones from coarse siliciclastic intervals, the determination of their systematic position is somewhat aggravated. Despite this, a diverse fauna including Lingulida, Obolellida, Naukatida, Kutorginida, Orthida and stem-group brachiopods have been successfully identified. A total of 16 taxa were noted for the Campito fauna, including the problematic and rare genera Swantonia and Spinulothele but unfortunately little new information could be gained regarding the characters for these rare genera. Four genera are reported for the first time from the area, not including material described under open nomenclature. Under den geologiska tidsåldern Kambrium (542-488 miljoner år sedan) uppträder de första fossilerna av djurgruppen brachiopoder, eller armfotingar som de också kallas, tillsammans med många andra djurgrupper. Få platser i Laurentia (paleo-kontinent bestående av nutidens Nordamerika och Grönland) finns kvar som har bevarat de tidigaste förekommande brachiopod fossilerna. Esmeralda län i Nevada är en sådan plats och det här har det även spekulerats att Laurentias absolut äldsta brachiopod fossil skulle kunna hittas där. Denna ... Bachelor Thesis Grönland Uppsala University: Publications (DiVA) Esmeralda ENVELOPE(-62.700,-62.700,-74.433,-74.433) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
lower Cambrian Begadean Waucoban Laurentia brachiopod Nevada lägre Kambrium Natural Sciences Naturvetenskap |
spellingShingle |
lower Cambrian Begadean Waucoban Laurentia brachiopod Nevada lägre Kambrium Natural Sciences Naturvetenskap Saxén, Sara Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada |
topic_facet |
lower Cambrian Begadean Waucoban Laurentia brachiopod Nevada lägre Kambrium Natural Sciences Naturvetenskap |
description |
New brachiopod materials from the lower Cambrian (Global Stage 3 and lower Stage 4) of Esmeralda County, Nevada are described and their age distribution and diversity is discussed. The specimens originate from the Fritzaspis, “Fallotaspis”, “Nevadella” and Bonnia-Olenellus biozone which in the area correspond to the Campito Formation and the overlying Poleta Formation. As the specimens from the Gold Coin Member (Begadean Series) and the Montenegro Member (Waucoban Series) of the Campito Formation encompass the oldest samples, they were therefore prioritised as there was not enough time to describe all the specimens. The oldest known trilobites from Laurentia have previously been reported from the Gold Coin Member and it is of interest to determine if the brachiopods from the same member also are the oldest known from Laurentia.As many specimens are poorly preserved, especially the ones from coarse siliciclastic intervals, the determination of their systematic position is somewhat aggravated. Despite this, a diverse fauna including Lingulida, Obolellida, Naukatida, Kutorginida, Orthida and stem-group brachiopods have been successfully identified. A total of 16 taxa were noted for the Campito fauna, including the problematic and rare genera Swantonia and Spinulothele but unfortunately little new information could be gained regarding the characters for these rare genera. Four genera are reported for the first time from the area, not including material described under open nomenclature. Under den geologiska tidsåldern Kambrium (542-488 miljoner år sedan) uppträder de första fossilerna av djurgruppen brachiopoder, eller armfotingar som de också kallas, tillsammans med många andra djurgrupper. Få platser i Laurentia (paleo-kontinent bestående av nutidens Nordamerika och Grönland) finns kvar som har bevarat de tidigaste förekommande brachiopod fossilerna. Esmeralda län i Nevada är en sådan plats och det här har det även spekulerats att Laurentias absolut äldsta brachiopod fossil skulle kunna hittas där. Denna ... |
format |
Bachelor Thesis |
author |
Saxén, Sara |
author_facet |
Saxén, Sara |
author_sort |
Saxén, Sara |
title |
Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada |
title_short |
Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada |
title_full |
Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada |
title_fullStr |
Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada |
title_full_unstemmed |
Laurentia’s Oldest Brachiopods: Lower Cambrian Brachiopods of the Montezuma Range, Nevada |
title_sort |
laurentia’s oldest brachiopods: lower cambrian brachiopods of the montezuma range, nevada |
publisher |
Uppsala universitet, Institutionen för geovetenskaper |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-329678 |
long_lat |
ENVELOPE(-62.700,-62.700,-74.433,-74.433) |
geographic |
Esmeralda |
geographic_facet |
Esmeralda |
genre |
Grönland |
genre_facet |
Grönland |
op_relation |
Examensarbete vid Institutionen för geovetenskaper, 1650-6553 409 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-329678 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766021526409183232 |