Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications

The earliest records of the genus Spiticeras Uhlig in Western Gondwana occur in the Upper Jurassic-Lower Cretaceous deposits of the Vaca Muerta Formation in the Neuquén Basin, Argentina. Those records involve two species, Spiticeras acutum Gerth and Spiticeras hauthali Gerth, which were firstly desc...

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Detalles Bibliográficos
Autores principales: Vennari, V.V., Aguirre-Urreta, B.
Formato: JOUR
Materias:
Early Cretaceous
Late Jurassic
Neuquén Basin
Spiticeras
Vaca Muerta Formation
Western Gondwana
ammonite
Cretaceous
Gondwana
Jurassic
nanofossil
new record
new species
ornamentation
succession
taxonomy
type locality
type specimen
Argentina
Neuquen Basin
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v54_n1_p83_Vennari
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00027014_v54_n1_p83_Vennari
record_format dspace
spelling todo:paper_00027014_v54_n1_p83_Vennari2023-10-03T13:53:22Z Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications Vennari, V.V. Aguirre-Urreta, B. Early Cretaceous Late Jurassic Neuquén Basin Spiticeras Vaca Muerta Formation Western Gondwana ammonite Cretaceous Gondwana Jurassic nanofossil new record new species ornamentation succession taxonomy type locality type specimen Argentina Neuquen Basin The earliest records of the genus Spiticeras Uhlig in Western Gondwana occur in the Upper Jurassic-Lower Cretaceous deposits of the Vaca Muerta Formation in the Neuquén Basin, Argentina. Those records involve two species, Spiticeras acutum Gerth and Spiticeras hauthali Gerth, which were firstly described from Arroyo Durazno, Mendoza. A systematic revision and reconsideration of the biostratigraphic distribution of both species was performed based on the study of type material and new bed-by-bed collections in the type locality and other southern Mendoza sections. S. acutum and S. hauthali display a succession of ornamentation stages that, together with other morphological characters, sustain their assignation to the genus Spiticeras. Addidionally, macroconchiate and microconchiate specimens were identified in both taxa. The record of S. acutum from the lowermost beds assigned to the Late Tithonian-Early Berrisian Substeueroceras koeneni Assemblage Biozone substantiates the downwards extension of the known range of the species in the Neuquén Basin. Given that the basal portion of the S. koeneni Biozone can be correlated with the Late Tithonian Standard "Durangites" Zone and that these early spiticeratins records have been found to be associated with a Late Tithonian secondary nannofossil bioevent (Raghodiscus asper (Stradner) first occurrence) in two of the studied sections, a Late Tithonian age is suggested for the earliest records of Spiticeras in Gondwana. Fil:Vennari, V.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aguirre-Urreta, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v54_n1_p83_Vennari
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Early Cretaceous
Late Jurassic
Neuquén Basin
Spiticeras
Vaca Muerta Formation
Western Gondwana
ammonite
Cretaceous
Gondwana
Jurassic
nanofossil
new record
new species
ornamentation
succession
taxonomy
type locality
type specimen
Argentina
Neuquen Basin
spellingShingle Early Cretaceous
Late Jurassic
Neuquén Basin
Spiticeras
Vaca Muerta Formation
Western Gondwana
ammonite
Cretaceous
Gondwana
Jurassic
nanofossil
new record
new species
ornamentation
succession
taxonomy
type locality
type specimen
Argentina
Neuquen Basin
Vennari, V.V.
Aguirre-Urreta, B.
Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications
topic_facet Early Cretaceous
Late Jurassic
Neuquén Basin
Spiticeras
Vaca Muerta Formation
Western Gondwana
ammonite
Cretaceous
Gondwana
Jurassic
nanofossil
new record
new species
ornamentation
succession
taxonomy
type locality
type specimen
Argentina
Neuquen Basin
description The earliest records of the genus Spiticeras Uhlig in Western Gondwana occur in the Upper Jurassic-Lower Cretaceous deposits of the Vaca Muerta Formation in the Neuquén Basin, Argentina. Those records involve two species, Spiticeras acutum Gerth and Spiticeras hauthali Gerth, which were firstly described from Arroyo Durazno, Mendoza. A systematic revision and reconsideration of the biostratigraphic distribution of both species was performed based on the study of type material and new bed-by-bed collections in the type locality and other southern Mendoza sections. S. acutum and S. hauthali display a succession of ornamentation stages that, together with other morphological characters, sustain their assignation to the genus Spiticeras. Addidionally, macroconchiate and microconchiate specimens were identified in both taxa. The record of S. acutum from the lowermost beds assigned to the Late Tithonian-Early Berrisian Substeueroceras koeneni Assemblage Biozone substantiates the downwards extension of the known range of the species in the Neuquén Basin. Given that the basal portion of the S. koeneni Biozone can be correlated with the Late Tithonian Standard "Durangites" Zone and that these early spiticeratins records have been found to be associated with a Late Tithonian secondary nannofossil bioevent (Raghodiscus asper (Stradner) first occurrence) in two of the studied sections, a Late Tithonian age is suggested for the earliest records of Spiticeras in Gondwana.
format JOUR
author Vennari, V.V.
Aguirre-Urreta, B.
author_facet Vennari, V.V.
Aguirre-Urreta, B.
author_sort Vennari, V.V.
title Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications
title_short Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications
title_full Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications
title_fullStr Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications
title_full_unstemmed Earliest Records of the Genus Spiticeras Uhlig in the Neuquén Basin, Argentina: Systematic and Biostratigraphic Implications
title_sort earliest records of the genus spiticeras uhlig in the neuquén basin, argentina: systematic and biostratigraphic implications
url http://hdl.handle.net/20.500.12110/paper_00027014_v54_n1_p83_Vennari
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AT aguirreurretab earliestrecordsofthegenusspiticerasuhligintheneuquenbasinargentinasystematicandbiostratigraphicimplications
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