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 .
4-606: The Walloon Coal Measures are a Late Jurassic geologic subgroup in Queensland , Australia . Deposited within the Surat Basin , it is considered Oxfordian to early Tithonian in age based on lead-uranium dating of tuffites within the unit. The 420 to 700 metres (1,380 to 2,300 ft) thick formation comprises thin-bedded, claystones , shales , siltstones , lithic and sublithic to feldspathic arenites , coal seams and partings and minor limestone . The formation
8-694: Is laterally equivalent to the Mulgildie Coal Measures and Birkhead Formation . The formation, in the Jurassic in the South Polar region , has provided fossil flora and trace fossils of theropods , ornithopods and Changpeipus bartholomaii and Garbina roeorum . The dinosaur Rhoetosaurus is known from the unit. 11 tracks are known from the formation, mostly those of large (prints 30-75 centimetres in length) theropods. Late Jurassic In European lithostratigraphy ,
12-553: 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
16-534: 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
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