Abstract
Abstract In the Zemmour region (northern Mauritania, French West Africa) of the western Sahara, beds assigned to the Cambro-Ordovician are apparently transgressive toward the north-northeast, for dolomitic limestones are found only in the south and west. Observations in the Oumat el Ham massif show that there are two distinct series in the sequence, the marine Oumat el Ham series, overlain discordantly by the continental Garat el Hammoueid series. A conglomerate containing pebbles of the uppermost beds of the Oumat el Ham usually marks the disconformity.
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