Paleoecology of cambrian communities of central Sonora, Mexico: Paleoenvironmental and biostratigraphic considerations

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Abstract

Cambrian marine ecosystems in Mexico are constituted by diverse taxonomic groups, including trace fossils, poriferans, brachiopods, hyolithids, trilobites, echinoderms and other problematic fauna. The present research aims to identify and analyze the paleoecological characteristics of the marine ecosystems of central Sonora, Mexico; specifically, in the San José de Gracia area where the Proveedora, Buelna, Cerro Prieto and El Gavilán formations are exposed. In this study some ecological indices have been applied, such as Simpson's dominance and evenness, Shannon H′ diversity, Menhinick species richness and Chao total species richness. Guilds and adaptive strategies show how different environments were occupied through time. The present work constitutes the first paleoecological work for the marine ecosystems of Cambrian strata in Mexico.

The Proveedora Formation consists of fine-grained quartzarenite with high bioturbation and trace fossils, it shows a low species richness (4) and evenness, where suspension feeders are dominating. The paleoenvironmental analysis of this unit indicates a sandy environment, such as a coastal and sublittoral areas, sandbars or delta front. The Buelna Formation is composed of limestone interbedded with shale, containing algae, brachiopods, salterellids, hyolithids, trilobites and echinoderms. Mostly it possesses a medium species richness (9) and intermediate evenness. Functional groups are dominated by primary producers and suspension feeders. The paleoenvironmental analysis of this unit indicates a shallow marine environment. The Cerro Prieto Formation consists of an oolitic limestone strongly recrystallized with few fossils, mainly brachiopods and trilobites. It has a low species richness (2) distributed in an unevenness way since only one species occupies the whole site. It indicates a shallow marine environment of high energy. The El Gavilán Formation consists of a thick sequence of shale interbedded with limestone, having abundant fossils like poriferans, brachiopods, hyolithids and trilobites, with a species richness (16) and with a high evenness, exhibiting a great variety of functional groups, dominating the suspension feeders and nektobenthic forms. The paleoenvironmental analysis of this unit shows an open shelf environment.
Original languageSpanish (Mexico)
Pages (from-to)631
Number of pages645
JournalJournal of South American Earth Sciences
Volume92
DOIs
StatePublished - Apr 2019

Cite this

@article{1e95a53f23a04960bc12a5f5ea0e6eb0,
title = "Paleoecology of cambrian communities of central Sonora, Mexico: Paleoenvironmental and biostratigraphic considerations",
abstract = "Cambrian marine ecosystems in Mexico are constituted by diverse taxonomic groups, including trace fossils, poriferans, brachiopods, hyolithids, trilobites, echinoderms and other problematic fauna. The present research aims to identify and analyze the paleoecological characteristics of the marine ecosystems of central Sonora, Mexico; specifically, in the San Jos{\'e} de Gracia area where the Proveedora, Buelna, Cerro Prieto and El Gavil{\'a}n formations are exposed. In this study some ecological indices have been applied, such as Simpson's dominance and evenness, Shannon H′ diversity, Menhinick species richness and Chao total species richness. Guilds and adaptive strategies show how different environments were occupied through time. The present work constitutes the first paleoecological work for the marine ecosystems of Cambrian strata in Mexico.The Proveedora Formation consists of fine-grained quartzarenite with high bioturbation and trace fossils, it shows a low species richness (4) and evenness, where suspension feeders are dominating. The paleoenvironmental analysis of this unit indicates a sandy environment, such as a coastal and sublittoral areas, sandbars or delta front. The Buelna Formation is composed of limestone interbedded with shale, containing algae, brachiopods, salterellids, hyolithids, trilobites and echinoderms. Mostly it possesses a medium species richness (9) and intermediate evenness. Functional groups are dominated by primary producers and suspension feeders. The paleoenvironmental analysis of this unit indicates a shallow marine environment. The Cerro Prieto Formation consists of an oolitic limestone strongly recrystallized with few fossils, mainly brachiopods and trilobites. It has a low species richness (2) distributed in an unevenness way since only one species occupies the whole site. It indicates a shallow marine environment of high energy. The El Gavil{\'a}n Formation consists of a thick sequence of shale interbedded with limestone, having abundant fossils like poriferans, brachiopods, hyolithids and trilobites, with a species richness (16) and with a high evenness, exhibiting a great variety of functional groups, dominating the suspension feeders and nektobenthic forms. The paleoenvironmental analysis of this unit shows an open shelf environment.",
author = "{Cuen Romero}, F.J, and {Vald{\'e}z Holgu{\'i}n}, {Jos{\'e} Eduardo} and Buitr{\'o}n, {B. E.} and Rogelio Monreal and {Enr{\'i}quez Oca{\~n}a}, {Luis Fernando} and {Aguirre Hinojosa}, Eduardo and Ochoa-Granillo, {J. A.} and {Grijalva Noriega}, {Francisco Javier} and {Palafox Reyes}, {Juan Jos{\'e}}",
year = "2019",
month = "4",
doi = "https://doi.org/10.1016/j.jsames.2019.04.005",
language = "Espa{\~n}ol (M{\'e}xico)",
volume = "92",
pages = "631",
journal = "Journal of South American Earth Sciences",
issn = "0895-9811",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Paleoecology of cambrian communities of central Sonora, Mexico: Paleoenvironmental and biostratigraphic considerations

AU - Cuen Romero, F.J,

AU - Valdéz Holguín, José Eduardo

AU - Buitrón, B. E.

AU - Monreal, Rogelio

AU - Enríquez Ocaña, Luis Fernando

AU - Aguirre Hinojosa, Eduardo

AU - Ochoa-Granillo, J. A.

AU - Grijalva Noriega, Francisco Javier

AU - Palafox Reyes, Juan José

PY - 2019/4

Y1 - 2019/4

N2 - Cambrian marine ecosystems in Mexico are constituted by diverse taxonomic groups, including trace fossils, poriferans, brachiopods, hyolithids, trilobites, echinoderms and other problematic fauna. The present research aims to identify and analyze the paleoecological characteristics of the marine ecosystems of central Sonora, Mexico; specifically, in the San José de Gracia area where the Proveedora, Buelna, Cerro Prieto and El Gavilán formations are exposed. In this study some ecological indices have been applied, such as Simpson's dominance and evenness, Shannon H′ diversity, Menhinick species richness and Chao total species richness. Guilds and adaptive strategies show how different environments were occupied through time. The present work constitutes the first paleoecological work for the marine ecosystems of Cambrian strata in Mexico.The Proveedora Formation consists of fine-grained quartzarenite with high bioturbation and trace fossils, it shows a low species richness (4) and evenness, where suspension feeders are dominating. The paleoenvironmental analysis of this unit indicates a sandy environment, such as a coastal and sublittoral areas, sandbars or delta front. The Buelna Formation is composed of limestone interbedded with shale, containing algae, brachiopods, salterellids, hyolithids, trilobites and echinoderms. Mostly it possesses a medium species richness (9) and intermediate evenness. Functional groups are dominated by primary producers and suspension feeders. The paleoenvironmental analysis of this unit indicates a shallow marine environment. The Cerro Prieto Formation consists of an oolitic limestone strongly recrystallized with few fossils, mainly brachiopods and trilobites. It has a low species richness (2) distributed in an unevenness way since only one species occupies the whole site. It indicates a shallow marine environment of high energy. The El Gavilán Formation consists of a thick sequence of shale interbedded with limestone, having abundant fossils like poriferans, brachiopods, hyolithids and trilobites, with a species richness (16) and with a high evenness, exhibiting a great variety of functional groups, dominating the suspension feeders and nektobenthic forms. The paleoenvironmental analysis of this unit shows an open shelf environment.

AB - Cambrian marine ecosystems in Mexico are constituted by diverse taxonomic groups, including trace fossils, poriferans, brachiopods, hyolithids, trilobites, echinoderms and other problematic fauna. The present research aims to identify and analyze the paleoecological characteristics of the marine ecosystems of central Sonora, Mexico; specifically, in the San José de Gracia area where the Proveedora, Buelna, Cerro Prieto and El Gavilán formations are exposed. In this study some ecological indices have been applied, such as Simpson's dominance and evenness, Shannon H′ diversity, Menhinick species richness and Chao total species richness. Guilds and adaptive strategies show how different environments were occupied through time. The present work constitutes the first paleoecological work for the marine ecosystems of Cambrian strata in Mexico.The Proveedora Formation consists of fine-grained quartzarenite with high bioturbation and trace fossils, it shows a low species richness (4) and evenness, where suspension feeders are dominating. The paleoenvironmental analysis of this unit indicates a sandy environment, such as a coastal and sublittoral areas, sandbars or delta front. The Buelna Formation is composed of limestone interbedded with shale, containing algae, brachiopods, salterellids, hyolithids, trilobites and echinoderms. Mostly it possesses a medium species richness (9) and intermediate evenness. Functional groups are dominated by primary producers and suspension feeders. The paleoenvironmental analysis of this unit indicates a shallow marine environment. The Cerro Prieto Formation consists of an oolitic limestone strongly recrystallized with few fossils, mainly brachiopods and trilobites. It has a low species richness (2) distributed in an unevenness way since only one species occupies the whole site. It indicates a shallow marine environment of high energy. The El Gavilán Formation consists of a thick sequence of shale interbedded with limestone, having abundant fossils like poriferans, brachiopods, hyolithids and trilobites, with a species richness (16) and with a high evenness, exhibiting a great variety of functional groups, dominating the suspension feeders and nektobenthic forms. The paleoenvironmental analysis of this unit shows an open shelf environment.

U2 - https://doi.org/10.1016/j.jsames.2019.04.005

DO - https://doi.org/10.1016/j.jsames.2019.04.005

M3 - Artículo

VL - 92

SP - 631

JO - Journal of South American Earth Sciences

JF - Journal of South American Earth Sciences

SN - 0895-9811

ER -