Abstract
The Middle Miocene sedimentary sequence of Venado represents a semienclosed estuary with an external bioclastic sand bar, open to the Caribbean Sea. The sequence is constituted by approximately 100m of sediments which correspond to two depositional systems: a) lagoon or back barrier and b) carbonate sand bar. The first system is composed of tuffites, coquinas, fossiliferous sandstones and lenticular bioclastic carbonate. The second system is constituted of bioclastic sand bar and tidal channel deposits. The biogenic sands are composed of molusc and balanid debris. Miorofacies criteria indicate interlittoral to sublittoral environments. Diagenetic criteria point to a temporal emersion. The paleocurrents directions of the tidal channels give transport directions mainly towards the southeast. Thus, bioclastic sand barrier had a NE-SW orientation. This Atlantic-type epicontinental tropical estuary was dominated by heavy fluvial volcaniclastic input. Freshwater influence is reflected by the paleoecology of the micro-fauna.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
