Abstract of ref. 1246 (part):
The Miocene sediments overlying the basement rock units are transgressive and grade into each other vertically and laterally. They are represented by polygenic conglomerates, sandstones, marls and reef limestones. Five planktonic foraminiferal biozones, 3 Burdigalian and 2 Helvetian to Tortonian (?), were defined in these formations. 