Abstract
Abstract The upper Tithonian-Berriasian (uppermost Jurassic-lowermost Cretaceous) section of the Luc-en-Diois region (Drome, French Prealps) includes two conglomeratic sequences separated by marly limestones. Similar sections are known from several surrounding localities. The lower conglomerate at Luc-en-Diois is correlated with the upper Tithonian main breccia of Chomerac in the Ardeche region. The marly limestone contains microfauna of lower Berriasian ostracods. The upper conglomerate, with its associated red detrital limestone, may similarly be equivalent to the upper conglomerate of the Ardeche section; it is probably uppermost Berriasian, marking the Berriasian-Valanginian boundary.
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