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dc.contributor.author
Lazo, Dario Gustavo
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Bressan, Graciela Susana
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Schwarz, Ernesto
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Veiga, Gonzalo Diego
dc.date.available
2020-06-22T18:40:49Z
dc.date.issued
2020-04
dc.identifier.citation
Lazo, Dario Gustavo; Bressan, Graciela Susana; Schwarz, Ernesto; Veiga, Gonzalo Diego; First articulated stalked crinoids from the Mesozoic of South America: two new species from the Lower Cretaceous of the Neuquén Basin, west-central Argentina; Paleontological Society; Journal of Paleontology; 94; 4; 4-2020; 1-18
dc.identifier.issn
0022-3360
dc.identifier.uri
http://hdl.handle.net/11336/107826
dc.description.abstract
Two new isocrinids are described from the Lower Cretaceous Agrio Formation of the Neuquén Basin, west-central Argentina. Isocrinus (Chladocrinus) covuncoensis new species is based on several beautifully preservedspecimens from Valanginian beds of the Pilmatué Member. It is characterized by a small size, multiramose crownwith six arm divisions, 240 arm tips, mostly isotomous branching, seven (or rarely eight) secundibrachials, smoothand stout column, short noditaxis, and pentalobate columnals. The species occurs in a 30 mthick interval of cross-beddedsandstones and mixed clastic-carbonate sediments that represent the migration of large, tidally influenced, subaqueousdunes developed in the offshore. Sudden burial of crinoids that dwelled on the dune toes and interdunes, possibly bythe acceleration of the lee face migration, provided the exceptional preservation of specimens and thus this findincan be considered as a local crinoid Konservat Lagerstätte. Isocrinus (Chladocrinus) pehuenchensis new species isdescribed from a single articulated specimen preserved in a silty calcareous concretion collected from a late Hauterivianconcretion level of the Agua de la Mula Member. It is characterized by isotomous branching, eight or nine secundibrachials (IIBr), slender column ornamented with medial ridge of fine tubercles, interradius acuminated with fine tubercleson its tip, short noditaxis, and pentastellate columnals. It is associated with low-energy fall-out deposits in the offshore.The excellent state of preservation was due to an early cementation process by carbonate that enhanced lithificatioaround the specimen.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Paleontological Society
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
STALKED CRINOIDS
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MESOZOIC
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SOUTH AMERICA
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NEUQUÉN BASIN
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Paleontología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
First articulated stalked crinoids from the Mesozoic of South America: two new species from the Lower Cretaceous of the Neuquén Basin, west-central 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
2020-06-22T14:38:53Z
dc.journal.volume
94
dc.journal.number
4
dc.journal.pagination
1-18
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Lawrence
dc.description.fil
Fil: Lazo, Dario Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.description.fil
Fil: Bressan, Graciela Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.description.fil
Fil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Veiga, Gonzalo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.journal.title
Journal of Paleontology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/product/identifier/S0022336020000153/type/journal_article
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1017/jpa.2020.15
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