The Qatar Arch and the western part of Abu Dhabi were up-lifted in the Early Oligocene
and part of the Eocene was eroded.
The property exists within the Middle Eocene - Early Oligocene
porphyry copper belt and Domeyko fault system of northern Chile, which contains some of the countries' most significant porphyry copper-molybdenum and epithermal gold reserves.
New skeleton from the early Oligocene
of Germany indicates a stem-group position of diomedeoidid birds.
In the early Oligocene
(Rupelian), only three occurrences are known, one from Alaska, USA (Wahrhaflig et al.
Larger Foraminiferal Biostratigraphy of the Qom Formation, South of Uromieh (NW Iran).
The collision of the Australian Plate and the Asian Plates is estimated to have taken place in Early Oligocene
(about 30 million years ago).
The earliest catarrhines in the fossil record, creatures that were neither monkey nor ape, date back to the late Eocene to early Oligocene
epochs, 35 to 30 million years ago.
Here we report two genera and at least four species of small erycine snakes from the Early Oligocene
of the Badlands National Park in South Dakota.
Although primarily deep-water dwellers today, the fossil record suggests the family was not uncommon in continental seas and embayments through the early Oligocene
curtus in the early Oligocene
Upper Brule Formation, and H.
He looked through the North American mammal record to see how species responded to three periods of extreme climate change during the last 40 million years: a global cooling during the Eocene epoch, 37 million years ago; a severe cooling in the early Oligocene
, at 33 million years ago; and a drying in the Miocene at 7.
By the late Eocene and early Oligocene
, high-latitude climate had cooled sufficiently that conditions seemed frigid enough for continental glaciation.