Benthic Foraminifera and Ostracoda from Middle-Upper Miocene Sequences of Southern Ecuador

Martínez-García, Blanca; Corrochano, Diego; Suarez-Hernando, Oier; Solís-Alulima, Byron; Suárez-Bilbao, Aitziber; Ordiales, Amaia; Murelaga, Xabier

doi:10.5710/amgh.18.10.2016.2938

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Extensional tectonics occurring during the middle Miocene led to the formation of a coastal basin spanning the whole Ecuadorian Andes west of Cuenca (Steinmann, 1997;Hungerbühler et al, 2002). The sedimentary succession-preserved only in the Interandean Valley-consists of 2,700 m of fluvial, deltaic, brackish delta plain, lacustrine, and coastal sediments (Hungerbühler et al, 2002) firmly indicating that in mid-Miocene times the Cordillera Occidental was characterized by a coastal environment with marine influence (Bristow & Parodiz, 1982;Feldmann et al, 1993;Hungerbühler et al, 2002;Martínez-García et al, 2017;Nuttall, 1990;Steinmann, 1997). Steinmann et al (1999) and Hungerbühler et al (2002) proposed that during the mid-late Miocene this wide basin was inverted by E-W directed shortening, which also yielded the main exhumation event of the Cordillera Occidental.…”

Section: Regional Geological Setting and Features Of The Study Areamentioning

confidence: 99%

Significance of Northern Andes Terrane Extrusion and Genesis of the Interandean Valley: Paleomagnetic Evidence From the “Ecuadorian Orocline”

et al. 2021

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 20°-30° CW post-Late Miocene rotation of the Cordillera Occidental, no rotation of the Cordillera Real, southern Ecuador.  The southern Cordillera Occidental emplaced as a rotational nappe after late Miocene-Pliocene over the flexural Interandean Valley basin.  No paleomagnetic evidence for latitudinal terrane drift and orogen-parallel strike-slip activity since Mid-Late Eocene (~40 Ma).

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Section: Regional Geological Setting and Features Of The Study Areamentioning

confidence: 99%

Significance of Northern Andes Terrane Extrusion and Genesis of the Interandean Valley: Paleomagnetic Evidence From the “Ecuadorian Orocline”

et al. 2021

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Basin-fill development from marine to intermontane settings: Lithostratigraphy, Sedimentology and Paleogeography of the Malacatos-Vilcabamba basin in the southern Ecuadorian Andes

Solís-Alulima

Corrochano

Reyes

2021

Journal of South American Earth Sciences

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Microfósiles Calcáreos (Foraminifera Y Ostracoda) Del Mioceno Superior Del Noroeste Argentino

Zamudio

Carignano

2023

PEAPA

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Although the Neogene deposits of the Calchaquíes Valleys, northwestern Argentina, have been intensively studied, there are only a few works dealing with the calcareous microfauna. Thus, this study aims to provide detailed systematic descriptions of the calcareous microfauna recorded at the Playa del Zorro Alloformation and Chiquimil Formation, units exposed at the El Cajón Valley and Pampa hill respectively, Catamarca Province. Also, an assessment of the paleoenvironment, based on the calcareous microfossil association was carried out for both units. As a result, a new species of the ostracod genus Cyprideis Jones was recognized, namely Cyprideis calchaquiensis nov. sp., which was found associated with Perissocytheridea carrenoae Nicolaidis & Coimbra, Limnocythere spp. and the foraminifera Ammonia tepida Cushman. The low diversity assemblage, the predominance of rounded sieve pores on the valve surface of C. calchaquiensis nov. sp., and the presence of abnormal tests of A. tepida point to a shallow stressed water body that suffered evaporation episodes, resulting in fluctuating salinity. Interestingly, close similarities were observed between the Playa del Zorro Alloformation and Chiquimil Formation with the upper section of the Yecua Formation, Bolivia. This affinity could be explained by the passive dispersal capacities of the ostracods and foraminifers, the ecological preferences of the recognized taxa and the proximity of the outcrops, assisted by the development of mega wetlands.

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Benthic Foraminifera and Ostracoda from Middle-Upper Miocene Sequences of Southern Ecuador

Cited by 3 publications

References 24 publications

Significance of Northern Andes Terrane Extrusion and Genesis of the Interandean Valley: Paleomagnetic Evidence From the “Ecuadorian Orocline”

Significance of Northern Andes Terrane Extrusion and Genesis of the Interandean Valley: Paleomagnetic Evidence From the “Ecuadorian Orocline”

Basin-fill development from marine to intermontane settings: Lithostratigraphy, Sedimentology and Paleogeography of the Malacatos-Vilcabamba basin in the southern Ecuadorian Andes

Microfósiles Calcáreos (Foraminifera Y Ostracoda) Del Mioceno Superior Del Noroeste Argentino

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