Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats
Recent biostratigraphic and sedimentologic studies in the lower–mid Campanian ammonite-rich shelf deposits of the James Ross Basin, Antarctica made possible a precise reconstruction of facies tracts along an onshore–offshore transect about 70 km in length. In proximal, inner-shelf settings the Santa...
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ftconicet:oai:ri.conicet.gov.ar:11336/55622 2023-10-09T21:44:55+02:00 Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats Olivero, Eduardo Bernardo Raffi, María Eugenia application/pdf http://hdl.handle.net/11336/55622 eng eng Academic Press Ltd - Elsevier Science Ltd info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cretres.2017.03.001 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0195667116304049 http://hdl.handle.net/11336/55622 Olivero, Eduardo Bernardo; Raffi, María Eugenia; Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats; Academic Press Ltd - Elsevier Science Ltd; Cretaceous Research; 88; 8-2018; 79-89 0195-6671 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ AMMONITE FACIES AMMONITE HABITS ANTARCTICA CAMPANIAN ONSHORE–OFFSHORE TRENDS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.cretres.2017.03.001 2023-09-24T19:28:14Z Recent biostratigraphic and sedimentologic studies in the lower–mid Campanian ammonite-rich shelf deposits of the James Ross Basin, Antarctica made possible a precise reconstruction of facies tracts along an onshore–offshore transect about 70 km in length. In proximal, inner-shelf settings the Santa Marta Formation include trigoniid-rich coquinas and cross-bedded and massive sandstones. In distal, mid- to outer-shelf settings the age-equivalent Rabot Formation consists of bioturbated mudstones and interbedded inoceramid- and brachiopod-rich tempestites. Each of these sedimentary facies is characterized by a very distinctive ammonite facies, whose characterization along a neritic-oceanic gradient offer clues to ammonite habitats. Ammonite facies of proximal settings are dominated by relatively large and ornate kossmaticeratids, with subordinated heteromorphs, desmoceratids, gaudryceratids and tetragonitids. Taphonomy, size–frequency distribution, and non-lethal injuries attributed to arthropods consistently suggest a shallow habitat and a nektobenthic (demersal) mode of life for the kossmaticeratids. Conversely, in distal settings the ammonite facies is dominated by gaudryceratids, including large Anagaudryceras sp., and tetragonitids, with subordinated small kossmaticeratids and large pachydiscids. Restriction to offshore oceanic-influenced facies suggests that these gaudryceratids have a mesopelagic, planktic mode of life. The hamitocone heteromorphs are equally distributed in shallow and deep facies with a high degree of shell fragmentation, particularly in shallow settings. This pattern suggests that hamitocones were exposed to extensive post-mortem drift. Fil: Olivero, Eduardo Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; Argentina Fil: Raffi, María Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. ... Article in Journal/Newspaper Antarc* Antarctica Tierra del Fuego CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Austral Argentina Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Rabot ENVELOPE(-57.417,-57.417,-64.433,-64.433) Olivero ENVELOPE(-63.600,-63.600,-66.133,-66.133) Cretaceous Research 88 79 89 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
AMMONITE FACIES AMMONITE HABITS ANTARCTICA CAMPANIAN ONSHORE–OFFSHORE TRENDS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
AMMONITE FACIES AMMONITE HABITS ANTARCTICA CAMPANIAN ONSHORE–OFFSHORE TRENDS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Olivero, Eduardo Bernardo Raffi, María Eugenia Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats |
topic_facet |
AMMONITE FACIES AMMONITE HABITS ANTARCTICA CAMPANIAN ONSHORE–OFFSHORE TRENDS https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Recent biostratigraphic and sedimentologic studies in the lower–mid Campanian ammonite-rich shelf deposits of the James Ross Basin, Antarctica made possible a precise reconstruction of facies tracts along an onshore–offshore transect about 70 km in length. In proximal, inner-shelf settings the Santa Marta Formation include trigoniid-rich coquinas and cross-bedded and massive sandstones. In distal, mid- to outer-shelf settings the age-equivalent Rabot Formation consists of bioturbated mudstones and interbedded inoceramid- and brachiopod-rich tempestites. Each of these sedimentary facies is characterized by a very distinctive ammonite facies, whose characterization along a neritic-oceanic gradient offer clues to ammonite habitats. Ammonite facies of proximal settings are dominated by relatively large and ornate kossmaticeratids, with subordinated heteromorphs, desmoceratids, gaudryceratids and tetragonitids. Taphonomy, size–frequency distribution, and non-lethal injuries attributed to arthropods consistently suggest a shallow habitat and a nektobenthic (demersal) mode of life for the kossmaticeratids. Conversely, in distal settings the ammonite facies is dominated by gaudryceratids, including large Anagaudryceras sp., and tetragonitids, with subordinated small kossmaticeratids and large pachydiscids. Restriction to offshore oceanic-influenced facies suggests that these gaudryceratids have a mesopelagic, planktic mode of life. The hamitocone heteromorphs are equally distributed in shallow and deep facies with a high degree of shell fragmentation, particularly in shallow settings. This pattern suggests that hamitocones were exposed to extensive post-mortem drift. Fil: Olivero, Eduardo Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; Argentina Fil: Raffi, María Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. ... |
format |
Article in Journal/Newspaper |
author |
Olivero, Eduardo Bernardo Raffi, María Eugenia |
author_facet |
Olivero, Eduardo Bernardo Raffi, María Eugenia |
author_sort |
Olivero, Eduardo Bernardo |
title |
Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats |
title_short |
Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats |
title_full |
Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats |
title_fullStr |
Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats |
title_full_unstemmed |
Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats |
title_sort |
onshore–offshore trends in campanian ammonite facies from the marambio group, antarctica: implications for ammonite habitats |
publisher |
Academic Press Ltd - Elsevier Science Ltd |
url |
http://hdl.handle.net/11336/55622 |
long_lat |
ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-57.417,-57.417,-64.433,-64.433) ENVELOPE(-63.600,-63.600,-66.133,-66.133) |
geographic |
Austral Argentina Marambio Rabot Olivero |
geographic_facet |
Austral Argentina Marambio Rabot Olivero |
genre |
Antarc* Antarctica Tierra del Fuego |
genre_facet |
Antarc* Antarctica Tierra del Fuego |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cretres.2017.03.001 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0195667116304049 http://hdl.handle.net/11336/55622 Olivero, Eduardo Bernardo; Raffi, María Eugenia; Onshore–offshore trends in Campanian ammonite facies from the Marambio Group, Antarctica: Implications for ammonite habitats; Academic Press Ltd - Elsevier Science Ltd; Cretaceous Research; 88; 8-2018; 79-89 0195-6671 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.cretres.2017.03.001 |
container_title |
Cretaceous Research |
container_volume |
88 |
container_start_page |
79 |
op_container_end_page |
89 |
_version_ |
1779314612269744128 |