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Sedimentological and petrological analysis of the Gorafe-Hu&#233;lago formation (pliocene) permits to distinguish some different facies types which characterize the following subenvironments of lacustrine carbonate sedimentation: lutitic plain (silts, carbonatic silts and sands), swamps (coaly marls), carbonatic marshy rim (root-bioturbated limestones, nodulzar lemistones, paleosols, calcareous crusts and nodular marls) and lacustrine zone (algal limestones, fossiliferous limestones, marly limestones and marls). The distribution of this facies was strongly controlled by the tectonics (Negratin accident), which delimited a southern sunken block, predominantly with terrigenous facies (lutitic plain and swamps) and a northern uplifted block in which there is a greater development of carbonatic lacustrine sediments. Finally, these facies are organized in retractive, expansive or expansive-retractive sequences which mark the sedimentological evolution of the formation.  El an&#225;lisis sedimentol&#243;gico y petrol&#243;gico de los materiales carbonatados de la formaci&#243;n de Gorafe-Hu&#233;lago  (Plioceno), ha permitido diferenciar diversas facies que caracterizan varios subambientes de sedimentaci&#243;n carbonatada dentro de un sistema deposicional tluvio-lacustre: llanura lut&#237;tica (limos, limos carbonatados y arenas), zonas de encharcamiento palustre (margas carbonosas), orla palustre carbonatada (calizas bioturbadas por ra&#237;ces, calizas nodulosas y paleosuelos, costras calc&#225;reas y margas nodulosas) y zona lacustre (calizas algales laminadas y oncol&#237;ticas, calizas fosil&#237;feras, calizas margosas y margas). La evoluci&#243;n y distribuci&#243;n de las facies est&#225;n controladas por el accidente tect&#243;nico del Negratin, fundamentalmente transcurrente y que atraviesa la zona de estudio con una direcci&#243;n NE-SW. En el bloque levantado (sector N) tiene lugar una sedimentaci&#243;n carbonatada lacustre, mientras que en el bloque hundido (sector S) la sedimentaci&#243;n es fundamentalmente terr&#237;gena. Los materiales carbonatados que caracterizan la sedimentaci&#243;n lacustre se relacionan entre s&#237; y con otras facies terr&#237;genas en determinadas secuencias sedimentol&#243;gicas lacustres: secuencias de retracci&#243;n, secuencias de expansi&#243;n y secuencias de expansi&#243;n-retracci&#243;n

Análisis sedimentológico de los materiales lacustres (formacion de Gorafe-Huelago) del sector central de la depresión de Guadix