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According to lithological composition three units were stablished in the area studied:  a) Clayey unit. Green and pinkish clays with sandy beds and early formation of calcretes. Clay minerals association: smectite-mixed-layers (kerolite-stevensite) sepiolite-illite-kaolinite.  b) Clayey calcareous unit Green clays with calcretes and a sandy level at bottom of the unit. Clay minerals association: smectite-illite-palygorskite-sepiolite-kaolinite.  c) Clayey-dolomitic unit. Green clays with dolomicrites. Clay minerals association: smectiteillite-palygorskite-sepiolite.  Results let us to stablish a sepiolite and palygorskite genesis related to lacustrine paludine environments where pedodiagenetic processes (v.s. carbonation, dolomitization, silicification, vertic features) were responsible of smectite instability, with development of palygorskite or sepiolite, according to their respectively di or triocthedral character.  En el &#225;rea estudiada, desde un punto de vista litol&#243;gico se han diferenciado tres tramos:  a) Lut&#237;tico. Lutitas verdes y ros&#225;ceas con intercalaciones sam&#237;ticas e incipiente desarrollo de calcretas. la asociaci&#243;n de minerales de la arcilla es: esmectita-interestratificados (kerolitaestevensita)-sepiolita-illita-caolinita.  b) Lut&#237;tico-calc&#225;reo. Lutitas verdes y calcretas con un nivel sam&#237;tico en la base del tramo. La asociaci&#243;n de minerales de la arcil1a es: esmectita-illita-paligorskita-sepiolita-eaolinita.  c) Lut&#237;tico-dolom&#237;tico. Lutitas verdes y dolomicritas. La asociaci&#243;n de minerales de la arcilla es: esmectita-illita-paligorskita-sepiolita.  Los resultados permiten establecer una g&#233;nesis de sepiolita y paligorskita en relaci&#243;n con ambientes lacustres-palustres, donde los procesos edafodiagen&#233;ticos (carbonataci&#243;n, dolomitizaci&#243;n, silicificaci&#243;n, vertisolizaci&#243;n) provocan la desestabilizaci&#243;n de fases esmect&#237;ticas precursoras. De acuerdo con el car&#225;cter di o triocta&#233;drico de la esmectita se propicia la formaci&#243;n de paligorskita o sepiolita, respectivamente

Formación de sepiolita-paligorskita en litofacies lutítico-carbonáticas en el sector de Borox-Esquivias (cuenca de Madrid)