Geology and petrology of the Aragats massif (Armenia)

The Aragats upland is underlain by faulted schists of upper-Proterozoic and lower Paleozoic age. These are overlain by Upper Cretaceous volcanic rocks and limestones and those, in turn, by Eocene volcano-sedimentary rocks. A thick series of volcanic rocks whose , age has been in question overlies all those mentioned above. The present paper describes this series in great detail, characterizes it chemically, and gives new evidence on its age. On the basis of new finds of fossils in these rocks, and because they are cut by lower Miocene intrusive bodies, it is concluded that the volcanics in question are Oligocene. -- E. Ingersoll.