The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina

Three species of Karakaschiceras, K. attenuatus (Behrendsen, 1892), K. neumayri (Behrendsen, 1892), and K. lycoris (Leanza and Giovine, 1949), and one species of Neohoploceras, N. arnoldi (Pictet and Campiche, 1860), are described and figured from the Valanginian strata of the Neuquen basin in west-...

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Detalles Bibliográficos
Publicado: 1998
Materias:
Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Lycoris
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223360_v72_n1_p39_AguirreUrreta
http://hdl.handle.net/20.500.12110/paper_00223360_v72_n1_p39_AguirreUrreta
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00223360_v72_n1_p39_AguirreUrreta
record_format dspace
spelling paper:paper_00223360_v72_n1_p39_AguirreUrreta2023-06-08T14:49:43Z The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina Ammonite Karakaschiceras Neocomitidae Neohoploceras Valanginian Argentina Ammonoidea Cephalopoda Karakaschiceras Karakaschiceras Lycoris Neocomitidae Neohoploceras Neohoploceras Three species of Karakaschiceras, K. attenuatus (Behrendsen, 1892), K. neumayri (Behrendsen, 1892), and K. lycoris (Leanza and Giovine, 1949), and one species of Neohoploceras, N. arnoldi (Pictet and Campiche, 1860), are described and figured from the Valanginian strata of the Neuquen basin in west-central Argentina. The large collection of fossils available for study shows wide intraspecific variation regarding ornament and whorl section in Karakaschiceras neumayri and Neohoploceras arnoldi, casting some doubts on the current systematics applied to species of these genera. The biostratigraphic position of the four species in the Neuquen basin corresponds to the Karakaschiceras attenuatus Subzone of the Olcostephanus atherstoni Zone. This subzone is correlated with the Mediterranean Karakaschiceras inostranzewi and Saynoceras verrucosum zones of Europe at the base of upper Valanginian sections. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223360_v72_n1_p39_AguirreUrreta http://hdl.handle.net/20.500.12110/paper_00223360_v72_n1_p39_AguirreUrreta
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Karakaschiceras
Karakaschiceras
Lycoris
Neocomitidae
Neohoploceras
Neohoploceras
spellingShingle Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Karakaschiceras
Karakaschiceras
Lycoris
Neocomitidae
Neohoploceras
Neohoploceras
The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
topic_facet Ammonite
Karakaschiceras
Neocomitidae
Neohoploceras
Valanginian
Argentina
Ammonoidea
Cephalopoda
Karakaschiceras
Karakaschiceras
Lycoris
Neocomitidae
Neohoploceras
Neohoploceras
description Three species of Karakaschiceras, K. attenuatus (Behrendsen, 1892), K. neumayri (Behrendsen, 1892), and K. lycoris (Leanza and Giovine, 1949), and one species of Neohoploceras, N. arnoldi (Pictet and Campiche, 1860), are described and figured from the Valanginian strata of the Neuquen basin in west-central Argentina. The large collection of fossils available for study shows wide intraspecific variation regarding ornament and whorl section in Karakaschiceras neumayri and Neohoploceras arnoldi, casting some doubts on the current systematics applied to species of these genera. The biostratigraphic position of the four species in the Neuquen basin corresponds to the Karakaschiceras attenuatus Subzone of the Olcostephanus atherstoni Zone. This subzone is correlated with the Mediterranean Karakaschiceras inostranzewi and Saynoceras verrucosum zones of Europe at the base of upper Valanginian sections.
title The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_short The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_full The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_fullStr The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_full_unstemmed The ammonites Karakaschiceras and Neohoploceras (Valanginian neocomitidae) from the Neuquen basin, west-central Argentina
title_sort ammonites karakaschiceras and neohoploceras (valanginian neocomitidae) from the neuquen basin, west-central argentina
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223360_v72_n1_p39_AguirreUrreta
http://hdl.handle.net/20.500.12110/paper_00223360_v72_n1_p39_AguirreUrreta
_version_ 1768545082112212992

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