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Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Another term, "zone fossil", is used when the fossil has all the characters stated above except wide geographical distribution; thus, they correlate the surrounding rock to a biozone rather than a specific time period.
List of fossil species in the La Brea Tar Pits, California, United States List of fossil species in the London Clay , England List of White Sea biota species by phylum , Russia
This list will include the type fossils of each sauropodomorph species. In paleontology , a type specimen is one which is definitionally a member of a biological taxon . Additional specimens can only be "referred" to these taxa if an expert deems them sufficiently similar to the type and publishes that opinion in the scientific literature.
Other fossils have been found in England, France, Germany, Portugal, Switzerland and Tunisia. [2] [4] [5] Machimosaurus rex is the largest named teleosauroid and thalattosuchian, with an estimated length of up to 7.15 m (23.5 ft) (skull length 155 cm (61 in)). [6] Machimosaurus is the largest known crocodyliform of the Jurassic. [2] [3] [4] [6]
After 1.5 million years ago (extinction of Paranthropus), all fossils shown are human (genus Homo). After 11,500 years ago (11.5 ka, beginning of the Holocene), all fossils shown are Homo sapiens (anatomically modern humans), illustrating recent divergence in the formation of modern human sub-populations.
Named Gondwanax paraisensis, the four-legged reptile species was roughly the size of a small dog with a long tail, or about 1 meter (39 inches) long and weighing between 3 and 6 kg (7 to 13 pounds ...
The smallest theropod overall (including avians) is the currently extant bee hummingbird at 6.12 cm long and 2.6g for females, and 5.51 cm long and 3.25g for the males. [42] In the theropod lineage leading to birds, body size shrank continuously over a period of 50 million years, from an average of 163 kilograms (359 lb) down to 0.8 kg (1.8 lb ...
With over 1 billion years of the planet’s history preserved in the Grand Canyon, many kinds of life are represented in the rocks there — but no dinosaurs.