Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica

This paper describes tbe fossils, materials and paleoenviromnental conditions found in some outcrops near tbe town of Jesús María, Turrialba, Costa Rica. Tbe rock materials (reefal limestone, sandstones and conglomerates) are associated to tbe Punta Pelada Forrnation of Upper Oligocene tu Lower Mioc...

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Autor principal:	Aguilar Álvarez, Teresita
Formato:	Online
Idioma:	spa
Publicado:	Universidad de Costa Rica 1999
Acceso en línea:	https://revistas.ucr.ac.cr/index.php/rbt/article/view/19184

id	RBT19184
record_format	ojs
spelling	RBT191842022-05-25T21:18:11Z Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica Aguilar Álvarez, Teresita fossils systematics corals mollusks upper oligocene lower miocene Costa Rica Tbis paper describes tbe fossils, materials and paleoenviromnental conditions found in some outcrops near tbe town of Jesús María, Turrialba, Costa Rica. Tbe rock materials (reefal limestone, sandstones and conglomerates) are associated to tbe Punta Pelada Forrnation of Upper Oligocene tu Lower Miocene age. Outcrops are of reduced extent and are unevenly distributed, hence tbey are considered as patch reefs developed by enviromnental energy fluctuations, sea level changes and clastic sedimentation from sources on small islands acting togetber in narrow platforrns. Tbe structural and enviromnental characteristics where fossil communities developed were derived from tbe analysis of 460 samples containing 36 species. Tbe reefs represent low diversity communities comprising four coral species (three of tbem reef builders), 31 mollusks species (21 gastropods: a new species, 14 camivores, three herbivores and three of uncertain feeding habits; 10 bivalves species: five endobentbic and five epibentbic); algae ( at least three groups represented); sea urchins; foraminifers; crabs. Tbe eveuness index is low, mainly regarding tbe Scleractinian corals, where Antiguastrea cellulosa predominates (80% óf tbe recognized forrns). Tbe fossil assemblage suggests tbat tbe comm\lnities developed in shallow marine enviromnents (50-80 m deptb), affected by sea level changes, strung marine currents and clastic imput from nearby small islands. This paper describes tbe fossils, materials and paleoenviromnental conditions found in some outcrops near tbe town of Jesús María, Turrialba, Costa Rica. Tbe rock materials (reefal limestone, sandstones and conglomerates) are associated to tbe Punta Pelada Forrnation of Upper Oligocene tu Lower Miocene age. Outcrops are of reduced extent and are unevenly distributed, hence tbey are considered as patch reefs developed by enviromnental energy fluctuations, sea level changes and clastic sedimentation from sources on small islands acting togetber in narrow platforrns. Tbe structural and enviromnental characteristics where fossil communities developed were derived from tbe analysis of 460 samples containing 36 species. Tbe reefs represent low diversity communities comprising four coral species (three of tbem reef builders), 31 mollusks species (21 gastropods: a new species, 14 camivores, three herbivores and three of uncertain feeding habits; 10 bivalves species: five endobentbic and five epibentbic); algae ( at least three groups represented); sea urchins; foraminifers; crabs. Tbe eveuness index is low, mainly regarding tbe Scleractinian corals, where Antiguastrea cellulosa predominates (80% óf tbe recognized forrns). Tbe fossil assemblage suggests tbat tbe comm\lnities developed in shallow marine enviromnents (50-80 m deptb), affected by sea level changes, strung marine currents and clastic imput from nearby small islands. Universidad de Costa Rica 1999-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf https://revistas.ucr.ac.cr/index.php/rbt/article/view/19184 10.15517/rbt.v47i3.19184 Revista de Biología Tropical; Vol. 47 No. 3 (1999): Volume 47 – Regular number 3 – September 1999; 453–474 Revista de Biología Tropical; Vol. 47 Núm. 3 (1999): Volumen 47 – Volumen regular 3 – Setiembre 1999; 453–474 Revista Biología Tropical; Vol. 47 N.º 3 (1999): Volume 47 – Regular number 3 – September 1999; 453–474 2215-2075 0034-7744 spa https://revistas.ucr.ac.cr/index.php/rbt/article/view/19184/19233 Copyright (c) 1999 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0
institution	Universidad de Costa Rica
collection	Revista de Biología Tropical
language	spa
format	Online
author	Aguilar Álvarez, Teresita
spellingShingle	Aguilar Álvarez, Teresita Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
author_facet	Aguilar Álvarez, Teresita
author_sort	Aguilar Álvarez, Teresita
description	This paper describes tbe fossils, materials and paleoenviromnental conditions found in some outcrops near tbe town of Jesús María, Turrialba, Costa Rica. Tbe rock materials (reefal limestone, sandstones and conglomerates) are associated to tbe Punta Pelada Forrnation of Upper Oligocene tu Lower Miocene age. Outcrops are of reduced extent and are unevenly distributed, hence tbey are considered as patch reefs developed by enviromnental energy fluctuations, sea level changes and clastic sedimentation from sources on small islands acting togetber in narrow platforrns. Tbe structural and enviromnental characteristics where fossil communities developed were derived from tbe analysis of 460 samples containing 36 species. Tbe reefs represent low diversity communities comprising four coral species (three of tbem reef builders), 31 mollusks species (21 gastropods: a new species, 14 camivores, three herbivores and three of uncertain feeding habits; 10 bivalves species: five endobentbic and five epibentbic); algae ( at least three groups represented); sea urchins; foraminifers; crabs. Tbe eveuness index is low, mainly regarding tbe Scleractinian corals, where Antiguastrea cellulosa predominates (80% óf tbe recognized forrns). Tbe fossil assemblage suggests tbat tbe comm\lnities developed in shallow marine enviromnents (50-80 m deptb), affected by sea level changes, strung marine currents and clastic imput from nearby small islands.
title	Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
title_short	Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
title_full	Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
title_fullStr	Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
title_full_unstemmed	Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
title_sort	organismos de un arrecife-fósil (oligoceno superior-mioccno inferior),del caribe de costa rica
title_alt	Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica
publisher	Universidad de Costa Rica
publishDate	1999
url	https://revistas.ucr.ac.cr/index.php/rbt/article/view/19184
work_keys_str_mv	AT aguilaralvarezteresita organismosdeunarrecifefosiloligocenosuperiormioccnoinferiordelcaribedecostarica
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Organismos de un arrecife-fósil (Oligoceno Superior-Mioccno Inferior),del Caribe de Costa Rica

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