CLAYSLATES + ROOFING SLATES + PENCIL SLATES (PETROGRAPHY)
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BTARGILLACEOUS ROCKS + SHALES + CLAYSLATE + CLAY + MUDS (PETROGRAPHY)
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UDC552.521
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Descriptor GERTONSCHIEFER + DACHSCHIEFER + GRIFFELSCHIEFER (PETROGRAPHIE)
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Descriptor ENGCLAYSLATES + ROOFING SLATES + PENCIL SLATES (PETROGRAPHY)
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Descriptor FRESCHISTES/ARGILEUX (PÉTROGRAPHIE)
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Variant GERTONSCHIEFER (PETROGRAPHIE)
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Variant GERDACHSCHIEFER (PETROGRAPHIE)
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Variant GERGRIFFELSCHIEFER (PETROGRAPHIE)
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Variant GERSCHIEFER/TONSCHIEFER (PETROGRAPHIE)
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Variant GERSCHIEFER/DACHSCHIEFER (PETROGRAPHIE)
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Variant GERSCHIEFER/GRIFFELSCHIEFER (PETROGRAPHIE)
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Variant ENGCLAYSLATES (PETROGRAPHY)
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Variant ENGROOFING SLATES (PETROGRAPHY)
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Variant ENGPENCIL SLATES (PETROGRAPHY)
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Variant ENGSLATE/CLAYSLATE (PETROGRAPHY)
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Variant ENGSLATE/ROOFING SLATES (PETROGRAPHY)
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Variant ENGSLATE/PENCIL SLATES (PETROGRAPHY)
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Variant FRESCHISTES/ARDOISIERS (PÉTROGRAPHIE)
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NTARDESIA + LAVAGNA + PIETRA SERENA (PETROGRAPHY)