The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina
The Middle Tithonian rock and ammonite successions of Cañadón de los Alazanes (southern Neuquén-Mendoza Basin, Argentina), sampled for the first time, correlate almost exactly with those of the close localities Mallín de los Caballos and Mallín Quemado, but showing a comparatively reduced thicknes...
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| Autor principal: | |
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| Formato: | article artículo publishedVersion |
| Lenguaje: | Inglés |
| Publicado: |
Instituto de Fisiografía y Geología
2008
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/2133/673 http://hdl.handle.net/2133/673 |
| Aporte de: |
| id |
I15-R121-2133-673 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de Rosario |
| institution_str |
I-15 |
| repository_str |
R-121 |
| collection |
Repositorio Hipermedial de la Universidad Nacional de Rosario (UNR) |
| language |
Inglés |
| orig_language_str_mv |
eng |
| topic |
Middle Tithonian Neuquén-Mendoza Basin Ammonoidea biogeography time-correlation Tithoniano Medio Cuenca Neuquén-Mendoza biogeografía correlación temporal |
| spellingShingle |
Middle Tithonian Neuquén-Mendoza Basin Ammonoidea biogeography time-correlation Tithoniano Medio Cuenca Neuquén-Mendoza biogeografía correlación temporal Parent, Horacio The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina |
| topic_facet |
Middle Tithonian Neuquén-Mendoza Basin Ammonoidea biogeography time-correlation Tithoniano Medio Cuenca Neuquén-Mendoza biogeografía correlación temporal |
| description |
The Middle Tithonian rock and ammonite successions of Cañadón de los Alazanes (southern
Neuquén-Mendoza Basin, Argentina), sampled for the first time, correlate almost exactly with those of the
close localities Mallín de los Caballos and Mallín Quemado, but showing a comparatively reduced thickness.
The studied fauna comprises: Pseudolissoceras zitteli (Burckhardt) [M&m], Neochetoceras? sp.,
Pseudhimalayites subpretiosus (Uhlig) [M, = P. steinmanni (Haupt)], Torquatisphinctes proximus (Steuer)
transient αand transient β, and Corongoceras cf. alternans (Gerth) [M]. This fauna shows strong Tethyan
affinities enabling close time-correlation with the European standard chronostratigraphic scale. The type
specimens of P. zitteli, P. planiusculum (Zittel), P. rasile (Zittel), C. alternans and C. lotenoense (Spath) are
figured. The Haploceratid genus Pseudolissoceras Spath most probably originated in Early Tithonian
Hybonotum Zone populations of Haploceras carachtheis of Crussol (France), widely expanded its
biogeographic distribution in the Semiforme Zone in the form of P. zitteli, prior to the diachronous
disappearence of local adaptations in the Neuquén-Mendoza basin [P. pseudoolithicum (Haupt)] and northern
Central Tethys (P. concorsi Donze and Enay = P. bavaricum Barthel). P. subpretiosus occurs in the lower
Proximus Biozone (approximately upper Semiforme-lower Fallauxi Zones), although it appears to range, with
its local microconch Simocosmoceras adversum andinum Leanza and Olóriz, through the upper Zitteli and
lower Proximus Biozones in other localities of the basin. T. proximus occurs abundantly, differentiated in
transients α and β, the latter giving gradually origin to the early Andean himalayitids [e.g., Windhauseniceras
internispinosum (Krantz)] via Torquatisphinctes? windhauseni (Weaver sensu Leanza), a form close to
"Burckhardticeras" peroni (Roman). Both transients of T. proximus are mainly confined to the Proximus
Biozone and their sexual dimorphism remains unrecognized. |
| format |
article artículo publishedVersion |
| author |
Parent, Horacio |
| author_facet |
Parent, Horacio |
| author_sort |
Parent, Horacio |
| title |
The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina |
| title_short |
The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina |
| title_full |
The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina |
| title_fullStr |
The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina |
| title_full_unstemmed |
The Middle Tithonian (Upper Jurassic) Ammonoid fauna of Cañadón de los Alazanes, southern Neuquén-Mendoza Basin, Argentina |
| title_sort |
middle tithonian (upper jurassic) ammonoid fauna of cañadón de los alazanes, southern neuquén-mendoza basin, argentina |
| publisher |
Instituto de Fisiografía y Geología |
| publishDate |
2008 |
| url |
http://hdl.handle.net/2133/673 http://hdl.handle.net/2133/673 |
| work_keys_str_mv |
AT parenthoracio themiddletithonianupperjurassicammonoidfaunaofcanadondelosalazanessouthernneuquenmendozabasinargentina AT parenthoracio middletithonianupperjurassicammonoidfaunaofcanadondelosalazanessouthernneuquenmendozabasinargentina |
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Repositorios |
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1764820413386326016 |