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Koolasuchus was a large, aquatic temnospondyl, measuring up to 3 metres (9.8 ft) in length and weighing up to 500 kilograms (1,100 lb). [ 7 ] [ 8 ] [ 9 ] Like other chigutisaurids, it had a wide, rounded head and tabular horns projecting from the back of the skull. [ 10 ]
Call it shovel and pail-eontology. Three North Dakota boys made the extraordinary discovery of a highly rare Tyrannosaurus rex fossil that could change what we know about dinosaurs.
The most complete specimen measures 12.3–12.4 m (40–41 ft) in length, but according to most modern estimates, Tyrannosaurus could have exceeded sizes of 13 m (43 ft) in length, 3.7–4 m (12–13 ft) in hip height, and 8.8 t (8.7 long tons; 9.7 short tons) in mass.
Argentinosaurus (meaning "lizard from Argentina") is a genus of giant sauropod dinosaur that lived during the Late Cretaceous period in what is now Argentina.Although it is only known from fragmentary remains, Argentinosaurus is one of the largest known land animals of all time, perhaps the largest, measuring 30–35 m (98–115 ft) long and weighing 65–80 t (72–88 short tons).
Based on the size of the tibia, experts estimate the dinosaur was 13 to 15 years old when it died and likely weighed around 3,500 pounds — about two-thirds of the size of a fully-grown adult T rex.
It was about 2.7 m (8 ft 10 in) in body length, and about 1.5 m (4 ft 11 in) high at the shoulder and resembled a heavy rhinoceros. Although incomplete, the preserved fossils suggests that Mixotoxodon were the most massive member of the group, with a weight about 3.8 t (4.2 short tons). [258]
Based on early estimates, Lyson thinks the fossil is that of a young T. rex that died of an unknown cause when it was 13 or 15 years old. It was about 25 feet long and weighed about 3,500 pounds.
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]