The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 161.5 ± 1.0 to 145.0 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic strata .
5-534: The Qigu Formation is a Late Jurassic ( Oxfordian ) geologic formation in the Southern Junggar Basin in China . Indeterminate Dinosaur remains are among the fossils that have been recovered from the formation, including theropod teeth and a fibula. a stegosaur dorsal vertebra and a Eusauropod tooth. Xinjiangtitan was erroneously thought to be from this formation, but it is actually from
10-590: Is thought to likely belong to the Qigu Formation, though it belongs to the strata of the Turpan Basin. Remains of indeterminate dinosaurs, including ankylosaurs , metriacanthosaurids, and dromaeosaurids are known from the formation. The remains of indeterminate rhamphorhynchid pterosaurs have been recovered from the formation. Among others, the following fossils have been found in the formation: Late Jurassic In European lithostratigraphy ,
15-553: The name " Malm " indicates rocks of Late Jurassic age. In the past, Malm was also used to indicate the unit of geological time, but this usage is now discouraged to make a clear distinction between lithostratigraphic and geochronologic/chronostratigraphic units. The Late Jurassic is divided into three ages, which correspond with the three (faunal) stages of Upper Jurassic rock: During the Late Jurassic Epoch, Pangaea broke up into two supercontinents , Laurasia to
20-534: The north, and Gondwana to the south. The result of this break-up was the spawning of the Atlantic Ocean . However, at this time, the Atlantic Ocean was relatively narrow. This epoch is well known for many famous types of dinosaurs , such as the sauropods , the theropods , the thyreophorans , and the ornithopods . Other animals, such as some crocodylomorphs and the first birds , appeared in
25-654: The older Qiketai Formation , which is in a different basin. The term "Qigu Formation" is also used to sediments of equivalent age in the Turpan Basin , but this might better be treated as a separate formation. It is laterally equivalent to the Shishugou Formation . The mass accumulation of Jurassic freshwater turtle fossils belonging to the genus Annemys , discovered in 2009 at a site nicknamed " Mesa Chelonia" in Shanshan County , Xinjiang
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