New Data on Dinosaurs in the Late Cretaceous Sediments of the Southern Urals
Abstract
We describe a new find of a dinosaur in the Southern Urals, a fragment of long bone of a large dinosaur from the Upper Cretaceous (Upper Santonian-Lower Campanian) sediments exposed in a quarry in the vicinity of the village of Izhberda (Orenburg oblast). The bone is characterized by the following features of the histological structure: the presence of strongly vascularized primary fibrolamellar bone tissue with a lamellar type of vascularization and the absence of cyclic growth marks. These histological features indicate the rapid continuous growth of the animal. Such features have been encountered in advanced representatives of duck-billed dinosaurs (hadrosaurids) and advanced sauropods (eusauropods) that were large in size and had not undergone the "island effect." The find from the Izhberda quarry is further evidence of the existence of large dinosaurs not subjected to the "island effect" on the supposed islands of the Late Cretaceous age in the Southern Urals or on the continental margin.
- Publication:
-
Doklady Earth Sciences
- Pub Date:
- August 2022
- DOI:
- 10.1134/S1028334X22080153
- Bibcode:
- 2022DokES.505..562S
- Keywords:
-
- dinosaurs;
- Izhberda;
- Russia;
- Santonian-Campanian;
- Turgai Strait;
- the Urals