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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Autónoma de Baja California
1993
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=48019106 |
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Sommario:
- Geología de la formación sepultura del paleoceno, en mesa de la sepultura, Baja California Patrick L. Abbott Andrew D. Hanson Celeste N. Thomson Deirdre L. Logue Kristine D. Bradshaw Woody Joe Pollard Thomas E. Seeliger Ciencias de la Tierra Paleocene limestone Sepultura Baja California At its Mesa de La Sepultura type area, the upper-lower to upper Paleocene SepulturaFormation lies with apparent disconformity on the lower Maastrichtian, marine upper slope andshelf deposits of the Rosario Formation. In places the uppermost Rosario Formation is marked bya kaolinite-rich paleosol. The Sepultura Formation is a deepening-upward sequence divided into alower glauconitic-clastic member and an upper limestone member. The lower member has a basalplutonic-volcanic conglomerate overlain by sandstone containing abundant Turritefla peninsuhisof late-early to early-late Paleocene age. The dominant lithology is calcite-cemented, glauconitic,fossiliferous arkose or lithic arkose of apparent Peninsular Ranges provenance. The beds containabundant red alga1 nodules, storm deposits, and iron-stained corrosion surfaces. Terrigenoussediment influx was diverted so that the upper member is virtually pure limestone dominated bybranching red algae fragments and forams but devoid of micrite. The Sepultura Formation atMesa de La Sepultura is a carbonate sediment-dominated record of late-early to late Paleocenedeepening that progressed from shallowest marine at the base to 200 m deep shelf waters at thetop. During this time, terrigenous toarse sediment deposition was blocked here even though itdominated in areas to the north and South. 1993 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48019106 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1 Vol.19