Arrecifes coralinos del Oligoceno Superior-Mioceno Inferior, de Turrialba, Costa Rica / Corals reef of the Upper Oligocene-Lower Miocene, of Turrialba, Costa Rica
Rev. biol. trop
;
49(Supl.2): 203-213, dic. 2001. ilus
Article
in Spanish
| LILACS
| ID: lil-502395
ABSTRACT
The outcrops at Jesús Maria (Turrialba, Cartago Province, Costa Rica) present limestone sequences 12 to 30 m thick (packstones biolithites, biomicrites; and wackstones biosparites, biomicrosparites), sandstones and conglomerates of Upper Oligocene-Lower Miocene age, correlated to the Punta Pelada Formation. The limestones are characterized by patch reefs with an irregular distribution and a reduced lateral extension (50 m), composed of corals (40%), calcareous algae and foraminiferans (30%), mollusks (20%), and in minor amounts fragments of barnacles, decapods, echinoderms and bryozoans. They consisted of low diversity communities possibly due to diverse geographical, geological and tectonic factors a narrow continental shelf, very shallow and isolated environments, sea level fluctuations, and exposure to clastic sedimentation associated with intermitent volcanic activity. Equity was also low, with corals making up 40% of all macrofossils, and one species, Antiguastrea cellulosa, as predominant (80% of the corals present). These bioconstructions were developed in an open circulation lagoon environment with transitions, in several occasions, to shallower environments represented by elastic sediments.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Calcium Carbonate
/
Geologic Sediments
/
Anthozoa
/
Biodiversity
Limits:
Animals
Country/Region as subject:
Central America
/
Costa Rica
Language:
Spanish
Journal:
Rev. biol. trop
Journal subject:
Biology
/
Tropical Medicine
Year:
2001
Type:
Article
Affiliation country:
Costa Rica
Institution/Affiliation country:
Universidad de Costa Rica/CR
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