Oroclinal bending of the Juan Fernández Ridge suggested by geohistory analysis of the Bahía Inglesa Formation, north-central Chile

Roux, J.P. Le; Achurra, L.E.; Henríquez, Álvaro; Carreño, Catalina; Rivera, Huber A.; Suárez, Mario E.; Ishman, Scott E.; Pyenson, Nicholas D.

doi:10.1016/j.sedgeo.2015.12.003

Cited by 17 publications

(33 citation statements)

References 49 publications

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“…Based on the putative presence of T. natans and shark fossils (Carcharodon hastalis), which occur together in beds of this age in the Sacaco area of Perú, Pyenson et al (2014) assigned a late Miocene age (9.03-6.45 Ma) to this member. A more recent revision of the chronostratigraphic framework of the Bahía Inglesa Formation, bracket the age of the Cerro Ballena Member to an age around 8.4 Ma (Le Roux et al, 2016). This confirm the suspects of Amson et al (2015b) about the possible temporal correlations between the Cerro Ballena Member (8.4 Ma; Bahía Inglesa) and the Aguada de Lomas horizon (8-8.8 Ma; Pisco Formation).…”

Section: Discussionsupporting

confidence: 63%

“…A reassess of the stratigraphic provenance of the materials previously mentioned might shed light about the diversity of Thalassocnus species inhabiting Chile during the late Neogene. The specimens reported for Pyenson et al (2014) were recovered from the Cerro Ballena locality, which belongs to the homonymous member of the Bahía Inglesa Formation (sensu Le Roux et al, 2016). Based on the putative presence of T. natans and shark fossils (Carcharodon hastalis), which occur together in beds of this age in the Sacaco area of Perú, Pyenson et al (2014) assigned a late Miocene age (9.03-6.45 Ma) to this member.…”

Section: Discussionmentioning

confidence: 99%

“…The specimen SGO.PV 1133 (Thalassocnus sp.) is from the "Arenas de Caldera" locality (Morro Member sensu Walsh and Suárez, 2005), which according to the new stratigraphic framework of Le Roux et al (2016) represent either the top of the Cerro Ballena Member or the base of the La Higuera Member. The age of this remains (SGO.…”

Section: Discussionmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

“…The Bahía Inglesa Formation forms a clastic and semi-consolidated sequence of Middle Miocene to Late Pliocene age, deposited in different sedimentary environments ranging from rocky shoreline to upper continental slope (Marquardt et al, 2000;Achurra, 2004;Le Roux et al, 2016). The main outcrops of the unit are found on the coast of the Atacama Region (around 27°S, Chile; e.g., Le Roux et al, 2016). Bahía Inglesa Formation is highly fossiliferous, presenting different stratigraphic levels with abundant marine vertebrates (e.g., Walsh and Hume, 2001;Suárez et al, 2004;Chávez, 2007Chávez, , 2008 and invertebrates (Marchant et al, 2000).…”

Section: Geological Contextmentioning

confidence: 99%

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How many species of the aquatic sloth Thalassocnus (Xenarthra: Megatheriidae) were in Chile?: new evidences from the Bahía Inglesa Formation, with a reappraisal of their biochronological affinities

Peralta-Prato

Solórzano

2019

andgeo

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The aquatic sloth, Thalassocnus, is one of the most intriguing lineage of mammal known from the southern pacific coast of South America during the late Neogene. It was initially recognized in Perú, but recent paleontological surveys also recorded its presence in Chile. However, the determination of how many species of Thalassocnus were actually present in Chile remains as an open question. Here, we provide a detailed morphological description of an isolated distal fragment of humerus recovered at the Mina Fosforita member (ca. 7 Ma), Bahía Inglesa Formation (Atacama Region, northern Chile), which is referred to Thalassocnus. Morphological comparisons with others forms from Chile and Perú allow us to attribute the CPUC/C/557 specimen to Thalassocnus cf. T. natans, though some degree of intraspecific variation is acknowledged. The assessment of the stratigraphic provenance of the materials with previously assigned to Thalassocnus from the Bahía Inglesa, Horcón and Coquimbo formations, permits us to propose that the taxonomic diversity of Thalassocnus in Chile is unequivocal conformed by T. carolomartini, and T. natans. We also admitted the likely presence of T. antiquus and probably T. yaucensis. Futures discoveries of more complete specimens, and/or the detailed analysis of undescribed specimens from Chile will undoubtedly contribute to illustrate the evolutionary history of the Thalassocnus radiation in Chile.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

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How many species of the aquatic sloth Thalassocnus (Xenarthra: Megatheriidae) were in Chile?: new evidences from the Bahía Inglesa Formation, with a reappraisal of their biochronological affinities

Peralta-Prato

Solórzano

2019

andgeo

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Anatomy and phylogeny of a new small macraucheniid (Mammalia: Litopterna) from the Bahía Inglesa Formation (late Miocene), Atacama Region, Northern Chile

et al. 2023

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We describe a new macraucheniine macraucheniid, Micrauchenia saladensis gen. et sp. nov., from the late Miocene (Huayquerian SALMA). This is the first litoptern from Bahía Inglesa Formation, Chile. The specimen includes a partial mandible, cervical and thoracic vertebrae fragments, and portions of the forelimbs (a scapula fragment, an ulna-radius fragment, seven carpals, three metapodials, two proximal phalanges and four intermediate phalanges). The postcranial anatomy of Micrauchenia saladensis is consistent with terrestrial and cursorial locomotion, which suggests an allochthonous position of this specimen within the marine Bahía Inglesa Formation. The fusion of the ulna and radius and the presence of a radial aliform expansion align Micrauchenia with other macraucheniines, with which it shares these features. We interpret the fusion of the ulna and radius as a cursorial specialization and the aliform expansion as an adaptation for strong flexion movements and to resist higher transverse stresses during locomotion. In addition, Micrauchenia saladensis is the smallest member of the subfamily Macraucheniinae. To test the systematics and phylogenetics of this specimen, we expanded previous morphological matrices of macraucheniids by adding one dental and eight postcranial characters and scoring Micrauchenia saladensis. We performed maximum parsimony and Bayesian phylogenetic analyses, the latter applied for the first time to macraucheniid phylogeny. Our analyses confirm Micrauchenia saladensis as a member of the subfamily Macraucheniinae, although with uncertain affinities within this subfamily.

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Early Miocene cartilaginous fishes (Chondrichthyes: Holocephali, Elasmobranchii) from Chile: Diversity and paleobiogeographic implications

Villafaña

Nielsen

Klug

et al. 2019

Journal of South American Earth Sciences

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Oroclinal bending of the Juan Fernández Ridge suggested by geohistory analysis of the Bahía Inglesa Formation, north-central Chile

Cited by 17 publications

References 49 publications

How many species of the aquatic sloth Thalassocnus (Xenarthra: Megatheriidae) were in Chile?: new evidences from the Bahía Inglesa Formation, with a reappraisal of their biochronological affinities

How many species of the aquatic sloth Thalassocnus (Xenarthra: Megatheriidae) were in Chile?: new evidences from the Bahía Inglesa Formation, with a reappraisal of their biochronological affinities

Anatomy and phylogeny of a new small macraucheniid (Mammalia: Litopterna) from the Bahía Inglesa Formation (late Miocene), Atacama Region, Northern Chile

Early Miocene cartilaginous fishes (Chondrichthyes: Holocephali, Elasmobranchii) from Chile: Diversity and paleobiogeographic implications

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