Polen y esporas de la Formación Navidad, Neógeno de Chile

Barreda, Viviana; Encinas, Alfonso; Hinojosa, Luis Felipe

doi:10.4067/s0716-078x2011000300003

Cited by 11 publications

(7 citation statements)

References 11 publications

(14 reference statements)

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“…The Goterones flora, on the other hand, occurs in fine-grained sandstones cross-cut by a submarine channel filled by massive sandstones with large siltstone rip-up clasts and containing abundant planktic foraminifers . In addition, pollen described from the Navidad Formation by Barreda et al (2011) was mostly derived from siltstones displaying trace fossils characteristic of the Zoophycos ichnofacies and yielding abundant planktic foraminifera. All of the aforementioned features are typical of deepmarine turbiditic systems, not tranquil nearshore settings.…”

Section: Sedimentologymentioning

confidence: 99%

Comment on ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78)

Finger¹,

Encinas

Nielsen

2013

Andgeo

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Section: Sedimentologymentioning

confidence: 99%

Comment on ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78)

Finger¹,

Encinas

Nielsen

2013

Andgeo

Self Cite

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“…Furthermore, the fossil pollen (Harris, 1972: figs. 17, 18; Barreda & al., 2011: fig. 3A) is very similar to extant pollen of G. valparadisaea (Harley, 1991: fig.…”

Section: Discussionmentioning

confidence: 99%

“…(2006): "Apparently, the western margin of the continent at mid latitudes remained fairly stable through these great convulsions, allowing for the conservation of ancient floristic assemblages." The fossil record of Sapotaceoidaepollenites rotundus W.K.Harris in the Miocene Navidad Formation (Barreda & al., 2011), indicates that Sapotaceae has been present in central Chile at least since this time. As S. rotundus was first described from early Tertiary sediments of southern Australia (Harris, 1972), the record is compatible with an Austral-Antarctic origin of this member of Sapotaceae that may be an ancestor of G. valparadisaea.…”

Section: Systematic Position Of Gayella and Comparison Withmentioning

confidence: 99%

Phylogenetic position and reinstatement of Gayella (Sapotaceae), a monotypic genus endemic to Chile with an Eocene origin in continental Australia

Swenson

Nylinder

Marticorena

et al. 2022

TAXON

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Pouteria splendens is the only native species of Sapotaceae in Chile, a species once placed in the monotypic genus Gayella and known as G. valparadisaea, but for a long time treated as a Pouteria. In a phylogenetic analysis, this species was placed in an Australasian clade, not with its presumed relatives in South America. We used Bayesian inference under a relaxed molecular clock in BEAST, nuclear ribosomal DNA (ETS, ITS), the nuclear gene RPB2, indel information, and 201 terminals to find the closest relative of P. splendens and to estimate the age of the disjunction between Australasia and South America. The taxon has an isolated phylogenetic position, being part of the cladeʼs backbone, and is placed with weak support as sister to Van‐royena, another monotypic genus, but endemic to Australia. Our results justify reinstatement of Gayella with its single species G. valparadisaea. Gayella has a unique combination of morphological features including alternate, opposite or 3‐whorled leaves, often on the same plant, a usually 6‐lobed, rotate corolla with revolute corolla lobes giving the flower a star‐like appearance, lacerate to dentate staminodes, and yellow‐orange‐red fruit with plano‐convex cotyledons and an exserted radicle below the cotyledon commissure. The split between Gayella and Van‐royena is estimated to the late Eocene at about 40.0 Ma (50.5–25.3 Ma). The hypothesis that the presence of Gayella in South America is a result of vicariance is consistent with the timing of the geological splits of southern Gondwana, as well as with evidence from fossil pollen, but long‐distance dispersal is an alternative explanation that cannot be excluded. Gayella is restricted to an area with a Mediterranean‐type climate in coastal central Chile, where it occurs in rocky places, ravines, and gullies, usually below 100 m altitude within reach of sea mist. Gayella valparadisaea is a rare plant, listed as Endangered (EN) in Chile, but it does not occur in any protected area. Considering the isolated phylogenetic position of this old lineage, we urge the Chilean authorities to increase the efforts towards protection of this species.

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“…de 29°30′S en la Argentina y 33°50′S en Chile (Barreda et al, , 2003(Barreda et al, , 2011. El material figurado como Nothofagidites sp.…”

Section: Paleoambienteunclassified

Palinomorfos Miocenos del Subsuelo de Santiago del Estero, Argentina

Ottone

Mazurier²,

Salinas³

2013

Ameghiniana

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Resumen. La asociación palinológica recuperada del pozo YPF.SE. LH.x-2 Los Horcones, provincia de Santiago del Estero, está dominada por Amaranthaceae/ Chenopodioideae y algas verdes continentales, con Nothofagaceae y Malvaceae subordinadas. En la parte superior de la sección muestreada hay también dinoflagelados y microforaminíferos marinos. La asociación se habría desarrollado en un ambiente lacustre. El cuerpo de agua habría estado rodeado por una vegetación mayormente hebáceo-arbustiva. El clima habría sido templado-cálido y relativamente árido. La palinoflora estaría relacionada con la ingresión marina que habría afectado el noroeste argentino durante el Mioceno medio (15-13 Ma).Palabras clave. Argentina. Mioceno. Palinomorfos. Transgresión marina.Abstract. SUBSURFACE MIOCENE PALYNOMORPHS FROM SANTIAGO DEL ESTERO, ARGENTINA. The palynological assemblage recovered from the YPF.SE. LH.x-2 Los Horcones well, Santiago del Estero Province, is dominated by Amaranthaceae/ Chenopodioideae and freshwater green algae, together with subordinate Nothofagaceae and Malvaceae. Marine dinoflagellates and foraminiferal linnings are also present in the upper half of the sampled section. This assemblage may have developed in a lacustrine environment. A mostly herbaceaous and shrubby vegetation may have surrounded the water-body. The climate may have been warm-temperate and relatively arid. The palynoflora could be related to the marine ingression that affected northwestern Argentina during the middle Miocene (15-13 My).

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Polen y esporas de la Formación Navidad, Neógeno de Chile

Cited by 11 publications

References 11 publications

Comment on ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78)

Comment on ‘Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications’ of Gutiérrez et al. (2013, Andean Geology 40 (1): 66-78)

Phylogenetic position and reinstatement of Gayella (Sapotaceae), a monotypic genus endemic to Chile with an Eocene origin in continental Australia

Palinomorfos Miocenos del Subsuelo de Santiago del Estero, Argentina

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