Bioestratigrafía de la Formación Uscari (Costa Rica) con base en foraminíferos planctónicos
The age of the Uscari Formation in the Victoria Area, located a few kilometers southwestern Limon City, is Medium to Upper Miocene, the samples were recolected in the central part of that area, in the Uscari creek (type locality) and in the mouth of the Watsi river.Twenty five species of Planktonic...
| Published in: | Revista Geológica de América Central |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | Spanish |
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Universidad de Costa Rica
2013
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| Online Access: | https://revistas.ucr.ac.cr/index.php/geologica/article/view/12336 https://doi.org/10.15517/rgac.v0i07.12336 |
| Summary: | The age of the Uscari Formation in the Victoria Area, located a few kilometers southwestern Limon City, is Medium to Upper Miocene, the samples were recolected in the central part of that area, in the Uscari creek (type locality) and in the mouth of the Watsi river.Twenty five species of Planktonic Foraminifera founded in forty two samples, recovered in the main rivers, were studied because of their biostratigraphic importance.The Coincident Extension Zones of Globorotalia siakensis Le Roy- G. menardii (Parker, Jones & Brady)- Orbulina spp. and Sphaeroidinellosis seminulina (Shwager) S. subdehiscens (Blow)- Globigerinoides extremus Bolli & Fermúdez, and data of Praeorbulina glomerosa (blow), Orbulina Globorotalia siakensis Le Roy and Globigerina nepenthes Todd, allow to assign a Middle to Upper Miocene age.Catapsydrax dissimilis (Cushman & Bermúdez), C. cf. unicavus (Bolli, Loeblich & Tappan) and Globigerina tripartita Koch are reworked material belonging to Lower Miocene rocks La edad de la Formación Uscari en al Area Victoria, ubicada a pocos kilómetros al suroeste de la ciudad de Limón, es Mioceno Medio a Superior. Las muestras fueron recolectadas en el sector central de esa área, en la quebrada Uscari y en la desembocadura del río Watsi.Se estudiaron veinticinco especies de Foraminíferos Planctónicos hallados en cuarenta y dos muestras recolectadas en los principales ríos de la zona. Las zonas de extensión coincidente de Globorotalia siakensis Le Roy- G. menardii (Parker, Jones & Brady)- Orbulina spp. y Shaerodinellopsis seminulina (Shwager)- S. subdehiscens (Blow)- Globigerinoides extremus Bolli & Bermúdez, y los data de Praeorbulina glomerosa (Blow), Orbulina, Globorotalia siakensis Le Roy y Globigerina nepenthes Todd permitieron asignar esa edad.Catapsydrax dissimilis (Cushman & Bermúdez), C. cf. unicavus (Bolli, Loeblich & Tappan) y Globicerina tripartita Koch se interpreta como material retrabajado presente en las rocas del Mioceno Inferior. |
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