التفاصيل البيبلوغرافية
| العنوان: |
Biotic community and landscape changes around the Eocene–Oligocene transition at Shapaja, Peruvian Amazonia: Regional or global drivers? |
| المؤلفون: |
Antoine, Pierre-Olivier, Yans, Johan, Aliaga Castillo, Angélica, Stutz, Narla, Abello, M. Alejandra, Adnet, Sylvain, Andriolli Custódio, Michele, Benites-Palomino, Aldo, Billet, Guillaume, Boivin, Myriam, Herrera, Fabiany, Jaramillo, Carlos, Mártinez, Camila, Moreno, Federico, Navarrete, Rosa E., Negri, Francisco Ricardo, Parra, Francisco, Pujos, François, Rage, Jean-Claude, Ribeiro, Ana Maria, Robinet, Céline, Roddaz, Martin, Tejada-Lara, Julia V., Varas-Malca, Rafael, Santos, Roberto Ventura, Salas-Gismondi, Rodolfo, Marivaux, Laurent |
| المصدر: |
Global and Planetary Change, 202, Art. No. 103512, (2021-07) |
| بيانات النشر: |
Elsevier |
| سنة النشر: |
2021 |
| المجموعة: |
Caltech Authors (California Institute of Technology) |
| مصطلحات موضوعية: |
Andes-Amazonia transition, Pozo System demise, Paleontology, Sedimentary geology, Chemostratigraphy, Paleoenvironments, Oceanography, Global and Planetary Change |
| الوصف: |
Since 2012, we have investigated a stratigraphic section encompassing the late Eocene–earliest Oligocene interval at Shapaja (Tarapoto area, Peruvian Amazonia, ca. 7°S), through paleontological and geological fieldwork. The measured sedimentary series (120 m-thick [West] plus 90 m-thick [East]), assigned to the upper member of the Pozo Formation, records fluvial micro-conglomeratic lenses intercalated with floodplain and evaporite-rich fine red deposits, estuarine/coastal-plain tidally-influenced fine sandstones, and oxbow lake nodule-rich blue clays. This sedimentary shift coincides locally with the demise of the large Eocene coastal-plain wetland known as Pozo System. The late Eocene–early Oligocene Shapaja section was extensively sampled for chemostratigraphy (δ¹³C on dispersed organic matter and pedogenic carbonate nodules), which in turn allowed for refining the location of the Eocene-Oligocene Transition (EOT) and other climatic events recognized at a global scale (i.e., Oi-1 and Oi-1a). The section has yielded nine fossil localities with plant remains (leaves, wood, charophytes, and palynomorphs), mollusks, decapods, and/or vertebrates (selachians, actinopterygians, lungfishes, amphibians, sauropsids, and mammals), documenting ~130 distinct taxa. Four localities of the upper member of the Pozo Formation at Shapaja predate the EOT, one is clearly within the EOT, while four are earliest/early Oligocene in age. The small leaf impressions found along the Shapaja section could be indicative of dry and/or seasonal conditions for this region throughout and after the EOT. Monkeys, indicative of tropical rainforest environments, are only recorded in a latest Eocene locality (TAR-21). Two biotic turnovers are perceptible in the selachian, metatherian, and rodent communities, well before the EOT [~35–36 Ma] and a few hundred thousand years after the EOT [~33 Ma]. The latter turnover seems to be primarily related to a global sea-level drop (ichthyofauna: marine-littoral elements replaced by obligate ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| العلاقة: |
https://doi.org/10.1016/j.gloplacha.2021.103512Test; oai:authors.library.caltech.edu:adhtr-yt087; eprintid:116209; resolverid:CaltechAUTHORS:20220810-751670000 |
| DOI: |
10.1016/j.gloplacha.2021.103512 |
| الإتاحة: |
https://doi.org/10.1016/j.gloplacha.2021.103512Test |
| حقوق: |
info:eu-repo/semantics/openAccess ; Other |
| رقم الانضمام: |
edsbas.14D99941 |
| قاعدة البيانات: |
BASE |
