The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils

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The stratigraphy of Cretaceous marine mudstones in the Fuegian Andes, roughly equivalent to Charles Darwin's clay-slate formation, remains a still unsolved problem. Previous records of Albian, Turonian-Coniacian, and Santonian-Campanian bivalves are combined with new findings of the Late Albian...

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Autores principales: Olivero, E.B., Medina, F.A., López C., M.I.
Formato: JOUR
Materias:
Ammonites
Clay-slate formation
Cretaceous
Fuegian andes
Inoceramid
Trace fossils
ammonite
biostratigraphy
bivalve
mudstone
new record
trace fossil
Andes
South America
Anagaudryceras
Bivalvia
Coniacian
Diplomoceras
Inoceramidae
Inoceramus
Nereites
Pachydiscus
Zoophycos
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v64_n1_p60_Olivero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v64_n1_p60_Olivero
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spelling todo:paper_00044822_v64_n1_p60_Olivero2023-10-03T13:58:29Z The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils Olivero, E.B. Medina, F.A. López C., M.I. Ammonites Clay-slate formation Cretaceous Fuegian andes Inoceramid Trace fossils ammonite biostratigraphy bivalve Cretaceous mudstone new record trace fossil Andes South America Anagaudryceras Bivalvia Coniacian Diplomoceras Inoceramidae Inoceramus Nereites Pachydiscus Zoophycos The stratigraphy of Cretaceous marine mudstones in the Fuegian Andes, roughly equivalent to Charles Darwin's clay-slate formation, remains a still unsolved problem. Previous records of Albian, Turonian-Coniacian, and Santonian-Campanian bivalves are combined with new findings of the Late Albian inoceramid Inoceramus anglicus Woods, and the Maastrichtian ammonites Diplomoceras sp., Anagaudryceras sp., Maorites densicostatus (Kilian and Reboul), Maorites sp., and Pachydiscus (Neodesmoceras) sp. to further constrain the Cretaceous stratigraphy of the eastern Fuegian Andes. In addition, new records of distinctive trace fossils and ichnofabric are meaningful for stratigraphic division and delineation of paleoenvironmental settings in these Cretaceous mudstones. The Lower Cretaceous ichnoassemblage of Chondrites targioni (Brongniart) and Zoophycos isp. is consistent with the inferred slope-volcaniclastic apron settings of the Yahgan Formation; Nereites missouriensis (Weller) reflects distal basin plain depositional settings for the Beauvoir Formation. In the Upper Cretaceous, the "Estratos de Buen Suceso" record the earliest extensively bioturbated horizons, reflecting prolonged well-oxygenated bottom conditions. In the Bahía Thetis Formation, organic-rich, channel margin or distal basin slaty mudstones record the last occurrence of inoceramid bivalves in the Austral Basin; the generalized absence of trace fossils is consistent with dysoxic bottom conditions. The thoroughly bioturbated Policarpo Formation, records a marked change in paleoceanographic conditions. The strong contrast in the intensity of bioturbation between the Upper Campanian-Maastrichtian Bahía Thetis Formation, almost devoid of trace fossils, and the highly bioturbated Maastrichtian-Danian Policarpo Formation reflects a change from dysoxic-anoxic to well ventilated conditions, probably associated with a cooling trend of bottom waters in the austral deep oceans. Fil:Olivero, E.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Medina, F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v64_n1_p60_Olivero
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ammonites
Clay-slate formation
Cretaceous
Fuegian andes
Inoceramid
Trace fossils
ammonite
biostratigraphy
bivalve
Cretaceous
mudstone
new record
trace fossil
Andes
South America
Anagaudryceras
Bivalvia
Coniacian
Diplomoceras
Inoceramidae
Inoceramus
Nereites
Pachydiscus
Zoophycos
spellingShingle Ammonites
Clay-slate formation
Cretaceous
Fuegian andes
Inoceramid
Trace fossils
ammonite
biostratigraphy
bivalve
Cretaceous
mudstone
new record
trace fossil
Andes
South America
Anagaudryceras
Bivalvia
Coniacian
Diplomoceras
Inoceramidae
Inoceramus
Nereites
Pachydiscus
Zoophycos
Olivero, E.B.
Medina, F.A.
López C., M.I.
The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils
topic_facet Ammonites
Clay-slate formation
Cretaceous
Fuegian andes
Inoceramid
Trace fossils
ammonite
biostratigraphy
bivalve
Cretaceous
mudstone
new record
trace fossil
Andes
South America
Anagaudryceras
Bivalvia
Coniacian
Diplomoceras
Inoceramidae
Inoceramus
Nereites
Pachydiscus
Zoophycos
description The stratigraphy of Cretaceous marine mudstones in the Fuegian Andes, roughly equivalent to Charles Darwin's clay-slate formation, remains a still unsolved problem. Previous records of Albian, Turonian-Coniacian, and Santonian-Campanian bivalves are combined with new findings of the Late Albian inoceramid Inoceramus anglicus Woods, and the Maastrichtian ammonites Diplomoceras sp., Anagaudryceras sp., Maorites densicostatus (Kilian and Reboul), Maorites sp., and Pachydiscus (Neodesmoceras) sp. to further constrain the Cretaceous stratigraphy of the eastern Fuegian Andes. In addition, new records of distinctive trace fossils and ichnofabric are meaningful for stratigraphic division and delineation of paleoenvironmental settings in these Cretaceous mudstones. The Lower Cretaceous ichnoassemblage of Chondrites targioni (Brongniart) and Zoophycos isp. is consistent with the inferred slope-volcaniclastic apron settings of the Yahgan Formation; Nereites missouriensis (Weller) reflects distal basin plain depositional settings for the Beauvoir Formation. In the Upper Cretaceous, the "Estratos de Buen Suceso" record the earliest extensively bioturbated horizons, reflecting prolonged well-oxygenated bottom conditions. In the Bahía Thetis Formation, organic-rich, channel margin or distal basin slaty mudstones record the last occurrence of inoceramid bivalves in the Austral Basin; the generalized absence of trace fossils is consistent with dysoxic bottom conditions. The thoroughly bioturbated Policarpo Formation, records a marked change in paleoceanographic conditions. The strong contrast in the intensity of bioturbation between the Upper Campanian-Maastrichtian Bahía Thetis Formation, almost devoid of trace fossils, and the highly bioturbated Maastrichtian-Danian Policarpo Formation reflects a change from dysoxic-anoxic to well ventilated conditions, probably associated with a cooling trend of bottom waters in the austral deep oceans.
format JOUR
author Olivero, E.B.
Medina, F.A.
López C., M.I.
author_facet Olivero, E.B.
Medina, F.A.
López C., M.I.
author_sort Olivero, E.B.
title The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils
title_short The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils
title_full The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils
title_fullStr The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils
title_full_unstemmed The stratigraphy of Cretaceous mudstones in the eastern Fuegian Andes: New data from body and trace fossils
title_sort stratigraphy of cretaceous mudstones in the eastern fuegian andes: new data from body and trace fossils
url http://hdl.handle.net/20.500.12110/paper_00044822_v64_n1_p60_Olivero
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