The Ordovician-Silurian shales in the Oued Mya-Erg Oriental region of Algeria expelled large amounts of oil as recently as Late Cretaceous time.

• 阿尔及利亚的Oued Mya-Erg东部地区的奥陶系-志留系页岩直到晚白垩世才排出大量的石油。