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Previously, the oldest record of dinosaurs was from Brazil and Argentina and dated back to the mid-late Carnian stage, about 233.23 to 231.4 million years ago. Nyasasaurus comes from a deposit conventionally considered Anisian in age, meaning that it would predate other early dinosaurs by about 12 million years. [ 1 ]
The oldest identified coelacanth fossils are around 420–410 million years old, dating to the early Devonian. [ 1 ] [ 48 ] Coelacanths were never a diverse group in comparison to other groups of fish, and reached a peak diversity during the Early Triassic (252–247 million years ago), [ 49 ] coinciding with a burst of diversification between ...
The earliest direct evidence of life are stromatolites found in 3.48 billion-year-old chert in the Dresser formation of the Pilbara Craton in Western Australia. [4] Several features in these fossils are difficult to explain with abiotic processes, for example, the thickening of laminae over flexure crests that is expected from more sunlight. [57]
Researchers are now proposing a surprising location for the birthplace of dinosaurs, based on the locations of the currently oldest-known dinosaur fossils, the evolutionary relationships among ...
The study found that the majority of the fossil footprints were formed by theropod dinosaurs, which were characterized by their three toes and hollow bones. A few other fossils were likely created ...
Fossil finds of ichthyosaur embryos showed that at least one group of marine reptiles had borne live young. The first to claim that similar embryos had been found in plesiosaurs was Harry Govier Seeley, who reported in 1887 having acquired a nodule with four to eight tiny skeletons. [126] In 1896, he described this discovery in more detail. [127]
A crocodile-like creature bit the neck of a flying dinosaur some 76 million years ago – and scientists have proof. Archaeologists found the fossilized neck bone of the young pterosaur in Canada ...
The fossils were later described in 2006 by paleontologists Leonardo Salgado and Zulma Gasparini, who named the type species A. oliveroi after Olivero. It was a medium-sized ankylosaur, reaching 4 meters (13 feet) in length or more, and showed characteristics of two different families, making more precise classification difficult for many years.