Factors controlling upper Jurassic ammonite assemblages in north central Mexico

Lower Kimmeridgian to Lower Tithonian (Upper Jurassic) sections studied at Sierra de Palotes (Durango) and Sierra de Catorce (San Luis Potosi), Mexico, show low-energ deposits in which the composition of fossil macroinvertebrate assemblages, including megabenthos, reflects biostratinomic control. Mo...

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Detalhes bibliográficos
Autores: Oloriz, F, Villasenor, AB, González-Arreola, C
Formato: artículo
Estado:Versión publicada
Fecha de publicación:1997
País:México
Recursos:Universidad Nacional Autónoma de México
Repositorio:Sistema de Información de la Facultad de Ciencias, UNAM
OAI Identifier:oai:repositorio.fciencias.unam.mx:11154/2812
Acesso em linha:http://hdl.handle.net/11154/2812
Access Level:acceso abierto
Palavra-chave:Paleontology
taphonomy
ammonites
Upper Jurassic
Mexico
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oai_identifier_str oai:repositorio.fciencias.unam.mx:11154/2812
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spelling Factors controlling upper Jurassic ammonite assemblages in north central MexicoOloriz, FVillasenor, ABGonzález-Arreola, CPaleontologytaphonomyammonitesUpper JurassicMexicoLower Kimmeridgian to Lower Tithonian (Upper Jurassic) sections studied at Sierra de Palotes (Durango) and Sierra de Catorce (San Luis Potosi), Mexico, show low-energ deposits in which the composition of fossil macroinvertebrate assemblages, including megabenthos, reflects biostratinomic control. Monotonous siltstones provide continuous records of ammonite assemblages and reflect dominant deposition of shells in living areasmeanwhile, discontinues records were forced by episodic post-mort em transportation of shells, which was especially accentuated under storm influence. Rhythmic marly-silty limestones and marls illustrate a fossil record probably determined by minor transgressive-regressive pulses. The major changes in lithofacies are reflected by condensed silty and phosphatic mudstones deposited during significant floodings affecting areas under dominant terrigenous sedimentation. These changes determined more or less significant variations in the composition of fossil assemblages according to their relation to changing ecological conditions. However, shifting ecospaces exhibit no direct relationship to changes in lithofacies. Post-mortem transportation, operating in relation to both marine floodings and changes in the pattern of upper-water currents, was the main biostratinomic factor affecting the areal distribution of ammonite populations. Shell transportation and sedimentation rate controlled preservation and ultimately influenced diversity in recorded ammonite assemblages. The post-mortem behaviour (interpreted from shell structure and preservation), and therefore distribution, of ammonite shells points to shallow-water environments during the Kimmeridgian - Early Tithonian in areas (such as SE Durango and San Luis Potosi) close to the changing boundary between dominant carbonate and terrigenous sedimentation. No reworking affecting ammonite biostratigraphy has been identified in the sections studied.2011-01-22T10:27:52Z2011-01-22T10:27:52Z1997info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article0024-1164http://hdl.handle.net/11154/2812289530(4):337-351reponame:Sistema de Información de la Facultad de Ciencias, UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenLethaiainfo:eu-repo/semantics/openAccessoai:repositorio.fciencias.unam.mx:11154/28122025-09-17T19:21:19Z
dc.title.none.fl_str_mv Factors controlling upper Jurassic ammonite assemblages in north central Mexico
title Factors controlling upper Jurassic ammonite assemblages in north central Mexico
spellingShingle Factors controlling upper Jurassic ammonite assemblages in north central Mexico
Oloriz, F
Paleontology
taphonomy
ammonites
Upper Jurassic
Mexico
title_short Factors controlling upper Jurassic ammonite assemblages in north central Mexico
title_full Factors controlling upper Jurassic ammonite assemblages in north central Mexico
title_fullStr Factors controlling upper Jurassic ammonite assemblages in north central Mexico
title_full_unstemmed Factors controlling upper Jurassic ammonite assemblages in north central Mexico
title_sort Factors controlling upper Jurassic ammonite assemblages in north central Mexico
dc.creator.none.fl_str_mv Oloriz, F
Villasenor, AB
González-Arreola, C
author Oloriz, F
author_facet Oloriz, F
Villasenor, AB
González-Arreola, C
author_role author
author2 Villasenor, AB
González-Arreola, C
author2_role author
author
dc.subject.none.fl_str_mv Paleontology
taphonomy
ammonites
Upper Jurassic
Mexico
topic Paleontology
taphonomy
ammonites
Upper Jurassic
Mexico
description Lower Kimmeridgian to Lower Tithonian (Upper Jurassic) sections studied at Sierra de Palotes (Durango) and Sierra de Catorce (San Luis Potosi), Mexico, show low-energ deposits in which the composition of fossil macroinvertebrate assemblages, including megabenthos, reflects biostratinomic control. Monotonous siltstones provide continuous records of ammonite assemblages and reflect dominant deposition of shells in living areas
publishDate 1997
dc.date.none.fl_str_mv 1997
2011-01-22T10:27:52Z
2011-01-22T10:27:52Z
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 0024-1164
http://hdl.handle.net/11154/2812
2895
identifier_str_mv 0024-1164
2895
url http://hdl.handle.net/11154/2812
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv Lethaia
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv 30(4):337-351
reponame:Sistema de Información de la Facultad de Ciencias, UNAM
instname:Universidad Nacional Autónoma de México
instacron:UNAM
instname_str Universidad Nacional Autónoma de México
instacron_str UNAM
institution UNAM
reponame_str Sistema de Información de la Facultad de Ciencias, UNAM
collection Sistema de Información de la Facultad de Ciencias, UNAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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