Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A.
Intensive sampling of uppermost Silurian to lowermost Devonian levels of the marine sequence of the Roberts Mountains Formation exposed in the Birch Creek II section, Nevada has yielded assemblages of vertebrate microremains dominated by acanthodian scales. Taxonomic assessment of the vertebrates re...
Published in: | PaleoBios |
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2023
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Online Access: | https://escholarship.org/uc/item/6bb3q574 https://escholarship.org/content/qt6bb3q574/qt6bb3q574.pdf https://doi.org/10.5070/P940454153 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt6bb3q574 2024-09-09T19:26:34+00:00 Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. Burrow, Carole Jan Murphy, Michael Turner, Susan 2023-01-01 application/pdf https://escholarship.org/uc/item/6bb3q574 https://escholarship.org/content/qt6bb3q574/qt6bb3q574.pdf https://doi.org/10.5070/P940454153 unknown eScholarship, University of California qt6bb3q574 https://escholarship.org/uc/item/6bb3q574 https://escholarship.org/content/qt6bb3q574/qt6bb3q574.pdf doi:10.5070/P940454153 CC-BY-NC-SA PaleoBios, vol 40, iss 4 paleobiogeography ‘Acanthodii’ Funicristata Thelodonti Heterostraci Chondrichthyes stem Osteichthyes article 2023 ftcdlib https://doi.org/10.5070/P940454153 2024-06-28T06:28:19Z Intensive sampling of uppermost Silurian to lowermost Devonian levels of the marine sequence of the Roberts Mountains Formation exposed in the Birch Creek II section, Nevada has yielded assemblages of vertebrate microremains dominated by acanthodian scales. Taxonomic assessment of the vertebrates represented shows a suite and succession of taxa most similar to those recorded from contemporary circum-Arctic assemblages, with scales of the poracanthodid acanthodians Poracanthodes punctatus, P. canadensis, Radioporacanthodes porosus and ischnacanthid Gomphonchus sandelensis most abundant below the Silurian–Devonian (S–D) boundary (as previously determined by conodont and graptolite occurrences), and stem chondrichthyan ‘acanthodians’ Nostovicina laticristata and other Nostovicina spp. (order, family indet.) the most abundant above the boundary. Just one endemic acanthodian taxon, Funicristata nevadaensis nov. gen. nov. sp., was found, in the uppermost Silurian. Agnathan vertebrate remains are rare relative to acanthodian scales, with dermal fragments of heterostracans at fewer than 10 levels and scales of thelodonts from 12 levels scattered throughout the whole section. Thelodonts Apalolepis, Barlowodus spp., ?Boreania, Gonioporus alatus, Lanarkia, Loganellia, Nikolivia, Talivalia, Thelodus, ?Turinia sp. and Trimerolepis spp. are found below the purported S–D boundary. Rare thelodont scales including Boreania sp. cf. minima, N. gutta and a single scale of ?Amaltheolepis sp. are found above the S–D boundary level. The only identifiable gnathostome remains of groups other than acanthodians are from the putative osteichthyan Lophosteus sp. and chondrichthyans Ellesmereia schultzei and Polymerolepis sp., in the uppermost Silurian levels. Article in Journal/Newspaper Arctic University of California: eScholarship Arctic PaleoBios 40 4 |
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Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
paleobiogeography ‘Acanthodii’ Funicristata Thelodonti Heterostraci Chondrichthyes stem Osteichthyes |
spellingShingle |
paleobiogeography ‘Acanthodii’ Funicristata Thelodonti Heterostraci Chondrichthyes stem Osteichthyes Burrow, Carole Jan Murphy, Michael Turner, Susan Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. |
topic_facet |
paleobiogeography ‘Acanthodii’ Funicristata Thelodonti Heterostraci Chondrichthyes stem Osteichthyes |
description |
Intensive sampling of uppermost Silurian to lowermost Devonian levels of the marine sequence of the Roberts Mountains Formation exposed in the Birch Creek II section, Nevada has yielded assemblages of vertebrate microremains dominated by acanthodian scales. Taxonomic assessment of the vertebrates represented shows a suite and succession of taxa most similar to those recorded from contemporary circum-Arctic assemblages, with scales of the poracanthodid acanthodians Poracanthodes punctatus, P. canadensis, Radioporacanthodes porosus and ischnacanthid Gomphonchus sandelensis most abundant below the Silurian–Devonian (S–D) boundary (as previously determined by conodont and graptolite occurrences), and stem chondrichthyan ‘acanthodians’ Nostovicina laticristata and other Nostovicina spp. (order, family indet.) the most abundant above the boundary. Just one endemic acanthodian taxon, Funicristata nevadaensis nov. gen. nov. sp., was found, in the uppermost Silurian. Agnathan vertebrate remains are rare relative to acanthodian scales, with dermal fragments of heterostracans at fewer than 10 levels and scales of thelodonts from 12 levels scattered throughout the whole section. Thelodonts Apalolepis, Barlowodus spp., ?Boreania, Gonioporus alatus, Lanarkia, Loganellia, Nikolivia, Talivalia, Thelodus, ?Turinia sp. and Trimerolepis spp. are found below the purported S–D boundary. Rare thelodont scales including Boreania sp. cf. minima, N. gutta and a single scale of ?Amaltheolepis sp. are found above the S–D boundary level. The only identifiable gnathostome remains of groups other than acanthodians are from the putative osteichthyan Lophosteus sp. and chondrichthyans Ellesmereia schultzei and Polymerolepis sp., in the uppermost Silurian levels. |
format |
Article in Journal/Newspaper |
author |
Burrow, Carole Jan Murphy, Michael Turner, Susan |
author_facet |
Burrow, Carole Jan Murphy, Michael Turner, Susan |
author_sort |
Burrow, Carole Jan |
title |
Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. |
title_short |
Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. |
title_full |
Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. |
title_fullStr |
Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. |
title_full_unstemmed |
Late Silurian to earliest Devonian vertebrate biostratigraphy of the Birch Creek II section, Roberts Mountains, Nevada, U.S.A. |
title_sort |
late silurian to earliest devonian vertebrate biostratigraphy of the birch creek ii section, roberts mountains, nevada, u.s.a. |
publisher |
eScholarship, University of California |
publishDate |
2023 |
url |
https://escholarship.org/uc/item/6bb3q574 https://escholarship.org/content/qt6bb3q574/qt6bb3q574.pdf https://doi.org/10.5070/P940454153 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
PaleoBios, vol 40, iss 4 |
op_relation |
qt6bb3q574 https://escholarship.org/uc/item/6bb3q574 https://escholarship.org/content/qt6bb3q574/qt6bb3q574.pdf doi:10.5070/P940454153 |
op_rights |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.5070/P940454153 |
container_title |
PaleoBios |
container_volume |
40 |
container_issue |
4 |
_version_ |
1809896158590402560 |