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dc.contributor.author
Melchor, Ricardo Nestor
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dc.date.available
2019-08-16T15:21:51Z
dc.date.issued
2009-12
dc.identifier.citation
Melchor, Ricardo Nestor; Bird tracks preserved in fluvial channel facies of the Río Negro Formation (Neogene), La Pampa Province, Argentina; Asociacion Paleontologica Argentina; Ameghiniana; 46; 1; 12-2009; 209-214
dc.identifier.issn
0002-7014
dc.identifier.uri
http://hdl.handle.net/11336/81720
dc.description.abstract
The vertebrate ichnofauna of the Neogene Río Negro Formation is composed of abundant mammal footprints and rare bird footprints. This ichnofauna has been extensively recorded from sea cliff exposures located south of the mouth, and also on the margin of the Negro river downstream of Carmen de Patagones city (figure 1). One of the remarkable aspects of this ichnofauna is the presence of trackways of large mammals, including those named as Megatherichnium oportoi Casamiquela, 1974, which provides evidence for bipedal locomotion in Megatherioidea (Casamiquela, 1974, Leonardi, 1994; Casinos, 1996). The tracks of other large mammals display a lower quality of preservation and have been recognized as Macrauchenichnus rector Casamiquela in Angulo and Casamiquela, 1982 and cf. Mylodontidichnum Aramayo and Manera de Bianco, 1987 (Angulo and Casamiquela, 1982; Aramayo, 1999; Aramayo et al., 2004). The materials used to erect other ichnotaxa of possible large mammals are poorly preserved tracks or undertracks and the status of that ichnotaxa is uncertain. This is the case of Falsatorichnum calceocannabius and Caballichnus impersonalis, which were tentatively assigned to Megatherioidea and Equidae by Casamiquela (in Angulo and Casamiquela, 1982). The remaining mammal trace fossils are Porcellusignum conculcator Casamiquela, in Angulo and Casamiquela, 1982 (purported Hydrochoeridae tracks); large meniscated burrows (compared by Casamiquela with Octodontidae burrows), and a digitigrade trackway assigned to a carnivorous marsupial (Angulo and Casamiquela, 1982; Leonardi, 1994; Aramayo et al., 2004). The record of bird tracks are restricted to one undertrack assigned to a phororhacid from the vicinity of El Cóndor town (Aramayo et al., 2004) and undetermined tracks of small birds found near Ingeniero Jacobacci (Casamiquela, 1969, p. 308; Leonardi, 1994, p. 35), both from Río Negro province. Despite that the outcrops of the Río Negro Formation cover a large area in Buenos Aires, Río Negro and La Pampa provinces, no findings of continental trace fossils have been reported for other localities. The purpose of this communication is to describe, to assign ichnotaxonomically, and to infer the paleoenvironmental significance of small bird tracks from outcrops of the Río Negro Formation at La Adela town, La Pampa province.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Asociacion Paleontologica Argentina
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Neogene
dc.subject
Fluvial
dc.subject
Fossil Footprints
dc.subject
Paleoenvironment
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Bird tracks preserved in fluvial channel facies of the Río Negro Formation (Neogene), La Pampa Province, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-08-14T18:45:11Z
dc.identifier.eissn
1851-8044
dc.journal.volume
46
dc.journal.number
1
dc.journal.pagination
209-214
dc.journal.pais
Argentina
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dc.journal.ciudad
Ciudad Autónoma de Buenos Aires
dc.description.fil
Fil: Melchor, Ricardo Nestor. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina
dc.journal.title
Ameghiniana
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://ref.scielo.org/qy86b5
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/187
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