New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica
Cape Marsh, located on the eastern end of Robertson Island to the east of the Antarctic Peninsula, exposes an isolated outcrop of Late Cretaceous sedimentary strata. The outcrop is approximately 120 km southwest of the much better-studied exposures of similar age on and around James Ross Island (JRI...
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Online Access: | https://doi.org/10.1016/j.cretres.2019.104313 |
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ftcaltechauth:oai:authors.library.caltech.edu:6hcgx-gy311 2024-10-13T14:01:55+00:00 New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica Tobin, Thomas S. Roberts, Eric M. Slotznick, Sarah P. Biasi, Joseph A. Clarke, Julia A. O'Connor, Patrick M. Skinner, Steven M. West, Abagael R. Snyderman, Lucia S. Kirschvink, Joseph L. Lamanna, Matthew C. 2020-04 https://doi.org/10.1016/j.cretres.2019.104313 unknown Elsevier https://doi.org/10.1016/j.cretres.2019.104313 eprintid:99895 info:eu-repo/semantics/closedAccess Other Cretaceous Research, 108, Art. No. 104313, (2020-04) Cretaceous Campanian James Ross Basin Biostratigraphy Detrital Zircon Antarctica info:eu-repo/semantics/article 2020 ftcaltechauth https://doi.org/10.1016/j.cretres.2019.104313 2024-09-25T18:46:39Z Cape Marsh, located on the eastern end of Robertson Island to the east of the Antarctic Peninsula, exposes an isolated outcrop of Late Cretaceous sedimentary strata. The outcrop is approximately 120 km southwest of the much better-studied exposures of similar age on and around James Ross Island (JRI); as such, its remoteness has complicated both logistical access to the site and hindered geologic correlations on a regional scale. Here we present the results of fieldwork conducted in 2016 that yielded a more diverse invertebrate fossil assemblage than had been previously recognized, in addition to new detrital zircon (U-Pb) and magnetostratigraphic data. The invertebrate fauna, particularly the ammonites and inoceramids, support a biostratigraphic correlation of the upper Cape Marsh strata to Ammonite Assemblage 7 previously established on JRI. U-Pb analysis conducted on a sandstone sample from the same strata indicates a maximum depositional age of 74.2 ± 1.1 Ma, and magnetostratigraphic interpretation of the lower strata suggest a normal magnetochron. These results are all consistent with a Campanian age for the deposition of the upper strata at Cape Marsh, and deposition during magnetochron C33N for the lower layers. However, a slight age inconsistency between the biostratigraphic correlation and the detrital zircon maximum depositional age may imply that the fossils are reworked. Regardless, these new data allow us to correlate the strata at Cape Marsh to the Santa Marta and Rabot formations (or possibly the lower part of the Snow Hill Island Formation) in the northern part of the James Ross Basin. © 2019 Elsevier Ltd. Received 10 May 2019, Revised 21 October 2019, Accepted 6 November 2019, Available online 16 November 2019. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Robertson Island Ross Island Snow Hill Island Caltech Authors (California Institute of Technology) Antarctic Antarctic Peninsula Cape Marsh ENVELOPE(161.433,161.433,-77.500,-77.500) Hill Island ENVELOPE(76.070,76.070,-69.395,-69.395) Rabot ENVELOPE(-57.417,-57.417,-64.433,-64.433) Robertson Island ENVELOPE(-59.667,-59.667,-65.167,-65.167) Ross Island Snow Hill ENVELOPE(-57.183,-57.183,-64.466,-64.466) Snow Hill Island ENVELOPE(-57.183,-57.183,-64.466,-64.466) The Antarctic Cretaceous Research 108 104313 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
Cretaceous Campanian James Ross Basin Biostratigraphy Detrital Zircon Antarctica |
spellingShingle |
Cretaceous Campanian James Ross Basin Biostratigraphy Detrital Zircon Antarctica Tobin, Thomas S. Roberts, Eric M. Slotznick, Sarah P. Biasi, Joseph A. Clarke, Julia A. O'Connor, Patrick M. Skinner, Steven M. West, Abagael R. Snyderman, Lucia S. Kirschvink, Joseph L. Lamanna, Matthew C. New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica |
topic_facet |
Cretaceous Campanian James Ross Basin Biostratigraphy Detrital Zircon Antarctica |
description |
Cape Marsh, located on the eastern end of Robertson Island to the east of the Antarctic Peninsula, exposes an isolated outcrop of Late Cretaceous sedimentary strata. The outcrop is approximately 120 km southwest of the much better-studied exposures of similar age on and around James Ross Island (JRI); as such, its remoteness has complicated both logistical access to the site and hindered geologic correlations on a regional scale. Here we present the results of fieldwork conducted in 2016 that yielded a more diverse invertebrate fossil assemblage than had been previously recognized, in addition to new detrital zircon (U-Pb) and magnetostratigraphic data. The invertebrate fauna, particularly the ammonites and inoceramids, support a biostratigraphic correlation of the upper Cape Marsh strata to Ammonite Assemblage 7 previously established on JRI. U-Pb analysis conducted on a sandstone sample from the same strata indicates a maximum depositional age of 74.2 ± 1.1 Ma, and magnetostratigraphic interpretation of the lower strata suggest a normal magnetochron. These results are all consistent with a Campanian age for the deposition of the upper strata at Cape Marsh, and deposition during magnetochron C33N for the lower layers. However, a slight age inconsistency between the biostratigraphic correlation and the detrital zircon maximum depositional age may imply that the fossils are reworked. Regardless, these new data allow us to correlate the strata at Cape Marsh to the Santa Marta and Rabot formations (or possibly the lower part of the Snow Hill Island Formation) in the northern part of the James Ross Basin. © 2019 Elsevier Ltd. Received 10 May 2019, Revised 21 October 2019, Accepted 6 November 2019, Available online 16 November 2019. |
format |
Article in Journal/Newspaper |
author |
Tobin, Thomas S. Roberts, Eric M. Slotznick, Sarah P. Biasi, Joseph A. Clarke, Julia A. O'Connor, Patrick M. Skinner, Steven M. West, Abagael R. Snyderman, Lucia S. Kirschvink, Joseph L. Lamanna, Matthew C. |
author_facet |
Tobin, Thomas S. Roberts, Eric M. Slotznick, Sarah P. Biasi, Joseph A. Clarke, Julia A. O'Connor, Patrick M. Skinner, Steven M. West, Abagael R. Snyderman, Lucia S. Kirschvink, Joseph L. Lamanna, Matthew C. |
author_sort |
Tobin, Thomas S. |
title |
New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica |
title_short |
New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica |
title_full |
New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica |
title_fullStr |
New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica |
title_full_unstemmed |
New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica |
title_sort |
new evidence of a campanian age for the cretaceous fossil-bearing strata of cape marsh, robertson island, antarctica |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.cretres.2019.104313 |
long_lat |
ENVELOPE(161.433,161.433,-77.500,-77.500) ENVELOPE(76.070,76.070,-69.395,-69.395) ENVELOPE(-57.417,-57.417,-64.433,-64.433) ENVELOPE(-59.667,-59.667,-65.167,-65.167) ENVELOPE(-57.183,-57.183,-64.466,-64.466) ENVELOPE(-57.183,-57.183,-64.466,-64.466) |
geographic |
Antarctic Antarctic Peninsula Cape Marsh Hill Island Rabot Robertson Island Ross Island Snow Hill Snow Hill Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Cape Marsh Hill Island Rabot Robertson Island Ross Island Snow Hill Snow Hill Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Robertson Island Ross Island Snow Hill Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Robertson Island Ross Island Snow Hill Island |
op_source |
Cretaceous Research, 108, Art. No. 104313, (2020-04) |
op_relation |
https://doi.org/10.1016/j.cretres.2019.104313 eprintid:99895 |
op_rights |
info:eu-repo/semantics/closedAccess Other |
op_doi |
https://doi.org/10.1016/j.cretres.2019.104313 |
container_title |
Cretaceous Research |
container_volume |
108 |
container_start_page |
104313 |
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1812813622914580480 |