Other significant bio-events with in the Rupelian
and presented as a regional zonal scheme based on the sedimentological and biostratigraphic study of the Nari Formation from the key stratigraphic section of the Thana Bola Khan area of Lower Indus Basin, Pakistan.
The Boom Clay is a marine sediment that was deposited in the early Oligocene (Rupelian
), 29 to 32 million years ago in the North Sea Basin, at water depths between 50 and 100 m .
Sediments in the Duhua and Linkou basins have the same depositional age, the Eocene-Oligocene [13-15], and the basalt age of samples from the Upper Hunchun Formation in the Dunhua Basin indicated the age of about 30 Ma , which points to the terminal stage of the Middle Rupelian
Huibrechts-Hern Formation located, at the base of the Rupelian
(earliest Oligocene), dated at 33.9 Ma (Van Simaeys and Vandenberghe, 2006; Vandenberghe et al., 2012).
1), During the Rupelian
and early Chattian, outer ramp facies (Pabdeh Formation) was predominant at the Qeshm section (well no.
Two species (Keasius parvus (Leriche, 1908), from the upper Rupelian
(Oligocene) Boom Clay of Belgium, and C.
Ludwig, A.O.: 2001a, Vertical movements since the beginnig of Rupelian
stage (map 1).
Seismic records show that this well is situated near the axis of the informally named Wenonah Canyon, which developed on the ancient Scotian Slope as early as the Ypresian or, more likely, Rupelian
As seen above, the rest of this association seems restricted of the Pyrenean area, so the existence of an endemic fauna or/and the beginning of a faunal differentiation between the Northern (Paris Basin, Normandy) and the southern faunas (Pyrenean and Aquitaine basins), which is observed since the Rupelian
(Lozouet and Maestrati, 1986; Merle et al., 2002), can be proposed as a hypothesis.
In the early Oligocene (Rupelian
), only three occurrences are known, one from Alaska, USA (Wahrhaflig et al.