Litoestratigrafía y mineralogía del yacimiento paleontológico de Makro-Las Rejas (Mioceno, Cuenca de Madrid)
- Omid Fesharaki 1
- Juan Antonio Cárdaba 2
- María Presumido 2
- Javier Salas-Herrera 1
- 1 Área de Paleontología, Departamento de Geodinámica, Estratigrafía y Paleontología. Facultad de Ciencias Geológicas. Universidad Complutense de Madrid
- 2 Geosfera C.B. Departamento de Innovación y Desarrollo. Madrid
ISSN: 0213-683X
Year of publication: 2020
Issue: 68
Pages: 15-18
Type: Article
More publications in: Geogaceta
Abstract
The lithostratigraphic characteristics of a new Miocene vertebra-te fossil site in the Madrid Basin are described. The stratigraphic succession is mainly formed of silty-clayey and marly lithologies, depo-sited in palustrine-lacustrine environments. A preliminary analysis of the mineralogy indicates predominance of phyllosilicates, followed by feldspars, quartz, carbonates (calcite and dolomite in very varia-ble quantities) and local evidence of gypsum. Smectites predominate in the clay fraction (always more than 70%) followed by micas and varying amounts of sepiolite and chlorite and/or kaolinite. Microtextures show different types of smectite particle associations generally forming honeycomb textures. Local modification of the microtexture due to bioturbation is observed, as well as evidence of microbial action.