Inicio  /  Andean Geology  /  Vol: 24 Núm: 2 Par: PP (1997)  /  Artículo
ARTÍCULO
TITULO

The Lower Cretaceous Apeleg Formation of the Aisen basin, Southern Chile. Tidal sandbar deposits of an epicontinental sea

C. Mike Bell    
Manuel Suarez    

Resumen

ABSTRACT. The Apeleg Formation is a Lower Cretaceous marine succession of the Aisen Basin of southern Chile. Clastic sediments were deposited in a shallow epicontinental sea in a north-south elongated retroarc basin. This sedimentary basin developed as thermal sag to the east of a subduction-related magmatic are on the South American continental margin. A sequence of up to 1,200 m of well-sorted sandstones and mudstones are characterised by nud-draped ripples and a well-preserved and varied trace fossil assemblage. The sediments were deposited as offshore tidal sandbars or sand ridges on a shallow marine shelf. RESUMEN. La Formacion Apeleg del Cretacico Inferior de la Cuenca de Aisen, sur de Chile: depositos mareales de bancos de arena de un mar epicontinental. La Formacion Apeleg es una sucesion marina del Cretacico Inferior, depositada en la Cuenca de Aisen, en el sur de Chile. Los sedimentos elasticos fueron depositados en un mar epicontinental somero en una cuenca de retroarco, elongada en direccion norte-sur y que se desarrollo por subsidencia termica al margen continental de America del Sur. Esta formacion comprende hasta 1.200 m je areniscas bien seleccionadas y lutitas, caracterizadas por ondulitas cubiertas de lodo, y una asociacion variada y bien preservada de trazas fosiles. Los sedimentos fueron depositados como bancos de arena mareales o bancos de arena en una plataforma marina somera.

 Artículos similares

       
 
Diana Elizabeth Fernández,Damián Eduardo Pérez,Leticia Luci,Martín Alejandro Carrizo     Pág. 210 - 223
Asterozoans are free living, star-shaped echinoderms which are important components of benthic marine faunas worldwide. Their fossil record is, however, poor and fragmentary, probably due to dissarticulation of ossicles. In particular, fossil asteroids a... ver más
Revista: Andean Geology

 
Pablo Rossel,Veronica Oliveros,José Mescua,Felipe Tapia,Mihai Nicolae Ducea,Sergio Calderón,Reynaldo Charrier,Derek Hoffman     Pág. 529 - 557
The uppermost Jurassic continental and volcanic deposits of the Río Damas-Tordillo Formation represent an interval of intense continental deposition within the Jurassic to Early Cretaceous dominantly marine environment of the Mendoza-Neuquén back-arc bas... ver más
Revista: Andean Geology

 
Telma B. Musso,Andrea Concheyro,Gisela Pettinari     Pág. 511 - 540
This study presents new mineralogical, sedimentological, and micropaleontological data from the Jagüel (Late Maastrichtian-Early Danian) and Roca (Danian) formations, located in the eastern sector of Pellegrini Lake, Río Negro province, República Argenti... ver más
Revista: Andean Geology

 
Augusto N. Varela,Daniel G. Poiré,Thomas Martin,Axel Gerdes,Francisco J. Goin,Javier N. Gelfo,Simone Hoffmann     Pág. 359 - 379
Despite the abundant fossil content of the Mata Amarilla Formation (Southern Patagonia, Santa Cruz Province, Argentina), its age has always generated a considerable number of questions and debates. The chronological data provided by invertebrates, dinosa... ver más
Revista: Andean Geology

 
Silvina De Valais,Victor Filippi,Sonia Molinas,Ricardo Souberlich     Pág. 541 - 547
The Mesozoic fossil record from Paraguay is almost non-existent, being the only exception the mention of two currently missing vertebrate trackways, found in slabs of the sidewalks of the Iglesia de la Catedral and of the iglesia María Auxiliadora. It is... ver más
Revista: Andean Geology