Molina, José MiguelReolid, Matías2014-03-112014-03-112010http://hdl.handle.net/10272/7851A hardground with Fe-Mn crusts of an important Middle-Upper Jurassic stratigraphic discontinuity in the External Subbetic has been analysed. These are mainly hydrogenetic-biogenic crusts induced by the activity of benthic microbial communities. The main organisms related with the Fe-Mn mineralization are probably fungi. The pelagic swells of the External Subbetic were a favourable environment for the development ofauthigenic mineralizations mainly by a very low rate of sedimentation and the existence of submarine volcanic processes in the neighboring Median SubbeticspaAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/HardgroundMicrobial communitiesFe-Mn crustsStratigraphic discontinuitiesJurassicjournal articleopen access