The stratigraphic position of the Lower Oligocene Yrieu Sands (southwestern France), based on calcareous nannofossils and a new Helicosphaera species
Steurbaut, E. (1983). The stratigraphic position of the Lower Oligocene Yrieu Sands (southwestern France), based on calcareous nannofossils and a new Helicosphaera species. Eclogae Geol. Helv. 76(2): 327-331
In: Eclogae Geologicae Helvetiae. Birkhäuser: Basel. ISSN 0012-9402; e-ISSN 1420-9128, meer
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