In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland)
“Ladatheca” cylindrica (Grabau, 1900) was a eurytopic metazoan with a calcareous operculum and an elongate, gently tapering conch up to 15+ cm long and with an apical angle of approximately 0.75–2.0°. This apparent polychaete was geographically widespread in the sub-trilobitic Lower Cambrian of midd...
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Cambridge University Press (CUP)
1993
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Online Access: | http://dx.doi.org/10.1017/s0022336000036817 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000036817 |
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crcambridgeupr:10.1017/s0022336000036817 2024-09-15T18:19:57+00:00 In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) Landing, Ed 1993 http://dx.doi.org/10.1017/s0022336000036817 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000036817 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 67, issue 3, page 333-342 ISSN 0022-3360 1937-2337 journal-article 1993 crcambridgeupr https://doi.org/10.1017/s0022336000036817 2024-07-31T04:04:20Z “Ladatheca” cylindrica (Grabau, 1900) was a eurytopic metazoan with a calcareous operculum and an elongate, gently tapering conch up to 15+ cm long and with an apical angle of approximately 0.75–2.0°. This apparent polychaete was geographically widespread in the sub-trilobitic Lower Cambrian of middle latitude, siliciclastic (middle and upper Placentian Series, Avalon Zone) and low latitude, carbonate platform (Tommotian Stage, Siberia(?) and Kazakhstan; and, probably, the upper Meishucunian Stage, southwestern China) sequences. In situ conchs (vertically to steeply inclined, apex down) of “Ladatheca” cylindrica are common in deep subtidal, siliciclastic mudstones (Chapel Island Formation) and in a peritidal algal mud mound(?) limestone (West Centre Cove Formation) in southeastern Newfoundland. Closely juxtaposed conchs locally form a worm reef at the top of the West Centre Cove Formation. This structure is older than the oldest archaeocyathan build-ups and is the earliest known metazoan-constructed biostrome. “Ladatheca” cylindrica was a dominant element of the sessile benthos prior to its apparent ecological displacement by Coleoloides typicalis Walcott, 1889, in the upper Placentian Series. Article in Journal/Newspaper Newfoundland Siberia Cambridge University Press Journal of Paleontology 67 3 333 342 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
“Ladatheca” cylindrica (Grabau, 1900) was a eurytopic metazoan with a calcareous operculum and an elongate, gently tapering conch up to 15+ cm long and with an apical angle of approximately 0.75–2.0°. This apparent polychaete was geographically widespread in the sub-trilobitic Lower Cambrian of middle latitude, siliciclastic (middle and upper Placentian Series, Avalon Zone) and low latitude, carbonate platform (Tommotian Stage, Siberia(?) and Kazakhstan; and, probably, the upper Meishucunian Stage, southwestern China) sequences. In situ conchs (vertically to steeply inclined, apex down) of “Ladatheca” cylindrica are common in deep subtidal, siliciclastic mudstones (Chapel Island Formation) and in a peritidal algal mud mound(?) limestone (West Centre Cove Formation) in southeastern Newfoundland. Closely juxtaposed conchs locally form a worm reef at the top of the West Centre Cove Formation. This structure is older than the oldest archaeocyathan build-ups and is the earliest known metazoan-constructed biostrome. “Ladatheca” cylindrica was a dominant element of the sessile benthos prior to its apparent ecological displacement by Coleoloides typicalis Walcott, 1889, in the upper Placentian Series. |
format |
Article in Journal/Newspaper |
author |
Landing, Ed |
spellingShingle |
Landing, Ed In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) |
author_facet |
Landing, Ed |
author_sort |
Landing, Ed |
title |
In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) |
title_short |
In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) |
title_full |
In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) |
title_fullStr |
In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) |
title_full_unstemmed |
In situ earliest Cambrian tube worms and the oldest metazoan-constructed biostrome (Placentian Series, southeastern Newfoundland) |
title_sort |
in situ earliest cambrian tube worms and the oldest metazoan-constructed biostrome (placentian series, southeastern newfoundland) |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s0022336000036817 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336000036817 |
genre |
Newfoundland Siberia |
genre_facet |
Newfoundland Siberia |
op_source |
Journal of Paleontology volume 67, issue 3, page 333-342 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022336000036817 |
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Journal of Paleontology |
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67 |
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3 |
container_start_page |
333 |
op_container_end_page |
342 |
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1810458296778227712 |