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 Upper 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 (JR...
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2020
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Online Access: | https://researchonline.jcu.edu.au/62562/1/Tobin%20et%20al%202020%20Robertson%20Island%20Antarctica.pdf |
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ftjamescook:oai:researchonline.jcu.edu.au:62562 2024-02-11T09:56:57+01:00 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 application/pdf https://researchonline.jcu.edu.au/62562/1/Tobin%20et%20al%202020%20Robertson%20Island%20Antarctica.pdf unknown Elsevier https://doi.org/10.1016/j.cretres.2019.104313 https://researchonline.jcu.edu.au/62562/ https://researchonline.jcu.edu.au/62562/1/Tobin%20et%20al%202020%20Robertson%20Island%20Antarctica.pdf 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., and Lamanna, Matthew C. (2020) New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica. Cretaceous Research, 108. 104313. restricted Article PeerReviewed 2020 ftjamescook https://doi.org/10.1016/j.cretres.2019.104313 2024-01-22T23:45:44Z Cape Marsh, located on the eastern end of Robertson Island to the east of the Antarctic Peninsula, exposes an isolated outcrop of Upper 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 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 U-Pb detrital zircon 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. Detrital zircon 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-derived 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica James Ross Island Robertson Island Ross Island Snow Hill Island James Cook University, Australia: ResearchOnline@JCU 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 |
James Cook University, Australia: ResearchOnline@JCU |
op_collection_id |
ftjamescook |
language |
unknown |
description |
Cape Marsh, located on the eastern end of Robertson Island to the east of the Antarctic Peninsula, exposes an isolated outcrop of Upper 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 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 U-Pb detrital zircon 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. Detrital zircon 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-derived 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. |
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. |
spellingShingle |
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 |
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://researchonline.jcu.edu.au/62562/1/Tobin%20et%20al%202020%20Robertson%20Island%20Antarctica.pdf |
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_relation |
https://doi.org/10.1016/j.cretres.2019.104313 https://researchonline.jcu.edu.au/62562/ https://researchonline.jcu.edu.au/62562/1/Tobin%20et%20al%202020%20Robertson%20Island%20Antarctica.pdf 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., and Lamanna, Matthew C. (2020) New evidence of a Campanian age for the Cretaceous fossil-bearing strata of Cape Marsh, Robertson Island, Antarctica. Cretaceous Research, 108. 104313. |
op_rights |
restricted |
op_doi |
https://doi.org/10.1016/j.cretres.2019.104313 |
container_title |
Cretaceous Research |
container_volume |
108 |
container_start_page |
104313 |
_version_ |
1790607216005349376 |