@article{PAR00023046,
  title = {{B}iotic community and landscape changes around the {E}ocene-{O}ligocene transition at {S}hapaja, {P}eruvian {A}mazonia : regional or global drivers ?},
  author = {{A}ntoine, {P}. {O}. and {Y}ans, {J}. and {C}astillo, {A}. {A}. and {S}tutz, {N}. and {A}bello, {M}. {A}. and {A}dnet, {S}. and {C}ustodio, {M}. {A}. and {B}enites-{P}alomino, {A}. and {B}illet, {G}. and {B}oivin, {M}. and {H}errera, {F}. and {J}aramillo, {C}. and {M}artinez, {C}. and {M}oreno, {F}. and {N}avarrete, {R}. {E}. and {N}egri, {F}. {R}. and {P}arra, {F}. and {P}ujos, {F}. and {R}age, {J}. {C}. and {R}ibeiro, {A}. {M}. and {R}obinet, {C}. and {R}oddaz, {M}artin and {T}ejada-{L}ara, {J}. {V}. and {V}aras-{M}alca, {R}. and {S}antos, {R}. {V}. and {S}alas-{G}ismondi, {R}. and {M}arivaux, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ince 2012, we have investigated a stratigraphic section encompassing the late {E}ocene-earliest {O}ligocene interval at {S}hapaja ({T}arapoto area, {P}eruvian {A}mazonia, ca. 7 degrees {S}), through paleontological and geological fieldwork. {T}he measured sedimentary series (120 m-thick [{W}est] plus 90 m-thick [{E}ast]), assigned to the upper member of the {P}ozo {F}ormation, 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. {T}his sedimentary shift coincides locally with the demise of the large {E}ocene coastal-plain wetland known as {P}ozo {S}ystem. {T}he late {E}ocene-early {O}ligocene {S}hapaja section was extensively sampled for chemostratigraphy (delta {C}-13 on dispersed organic matter and pedogenic carbonate nodules), which in turn allowed for refining the location of the {E}ocene-{O}ligocene {T}ransition ({EOT}) and other climatic events recognized at a global scale (i.e., {O}i1 and {O}i-1a). {T}he 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. {F}our localities of the upper member of the {P}ozo {F}ormation at {S}hapaja predate the {EOT}, one is clearly within the {EOT}, while four are earliest/early {O}ligocene in age. {T}he small leaf impressions found along the {S}hapaja section could be indicative of dry and/or seasonal conditions for this region throughout and after the {EOT}. {M}onkeys, indicative of tropical rainforest environments, are only recorded in a latest {E}ocene locality ({TAR}-21). {T}wo biotic turnovers are perceptible in the selachian, metatherian, and rodent communities, well before the {EOT} [-35-36 {M}a] and a few hundred thousand years after the {EOT} [-33 {M}a]. {T}he latter turnover seems to be primarily related to a global sea-level drop (ichthyofauna: marine-littoral elements replaced by obligate freshwater taxa) and/or the onset of a drier and more seasonal climate in early {O}ligocene times (terrestrial components). {C}hanges in the structure of the {S}hapaja paleocommunities were mostly driven by the flexural subsidence during the late {E}ocene, and then globally driven by the earliest {O}ligocene climatic deterioration.},
  keywords = {{A}ndes-{A}mazonia transition ; {P}ozo {S}ystem demise ; {P}aleontology ; {S}edimentary geology ; {C}hemostratigraphy ; {P}aleoenvironments ; {PEROU} ; {AMAZONIE}},
  booktitle = {},
  journal = {{G}lobal and {P}lanetary {C}hange},
  volume = {202},
  numero = {},
  pages = {103512 [20 p.]},
  ISSN = {0921-8181},
  year = {2021},
  DOI = {10.1016/j.gloplacha.2021.103512},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00023046},
}