Contribution a l'etude du Cambro-Ordovicien des chaines d'Ougarta

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Abstract
The Ougarta chain near Beni Abbes in western Algeria is a junction zone of unusual importance in regional stratigraphic correlations. The Ougarta sandstone series, exposed in an anticline from near Zerhamra southeast to Kerzaz, has several discordances within it. Its division into the following seven formations is proposed. The Sebkha el Melah arkosic sandstone, unconformable upon the rhyolite-metamorphic sole, and the overlying An en Nechea quartzite probably are lower Ordovician instead of Cambrian. The five remaining formations, the Foum Tineslem shale, the Kheneg el Aatene quartzitic sandstone, the Foum es Zeidiya shale, sandstone, and lenticular sandy limestone, the Bou M'Haoud ferruginous sandstone and shale, and the Djebel Serraf conglomerate, shale, and sandstone contain lower Ordovician faunas.

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