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"Stan", also known by its inventory number BHI 3033, is a Tyrannosaurus rex fossil found in the Hell Creek Formation in South Dakota, just outside of Buffalo in 1987, and excavated in 1992. [1] It is the fifth most complete T. rex fossil discovered to date, at more than 70% bulk.
A tooth from what is now documented as a Tyrannosaurus rex was found in July 1874 upon South Table Mountain (Colorado) by Jarvis Hall (Colorado) student Peter T. Dotson under the auspices of Prof. Arthur Lakes near Golden, Colorado. [1] In the early 1890s, John Bell Hatcher collected postcranial elements in eastern Wyoming.
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These facts alongside the roughness and rugosity of the skull are indications that this individual had reached an old age for a T. rex; in this case at least thirty years, as opposed to Sue's 28 years (which was the second oldest specimen known until now), making Trix the oldest Tyrannosaurus known.
The smallest known Tyrannosaurus rex individual (LACM 28471, the "Jordan theropod") is estimated to have weighed only 29.9 kilograms (66 lb) at only 2 years old, while the largest, such as FMNH PR2081 ("Sue"), most likely weighed about 5,654 kg (12,465 lb), estimated to have been 28 years old, an age which may have been close to the maximum for ...
The final cost was US$8,362,500. [19] [20] [21] Sue remains one of the most expensive dinosaur fossils ever sold, only surpassed in 2020 with the sale of Stan the T. rex. for $31.8 million, and subsequently in 2024 by Apex the Stegosaurus, which sold for $44.6 million.
Tyrannosauroidea (meaning 'tyrant lizard forms') is a superfamily (or clade) of coelurosaurian theropod dinosaurs that includes the family Tyrannosauridae as well as more basal relatives.
The holotype was named as Tyrannosaurus bataar by Evgeny Maleev as Tyrannosaurus bataar. [7] The genus Tarbosaurus was also described in the same year based on PIN 551–2, a specimen with a skull and skeletal remains discovered by the same expedition in 1948 and 1949 as Tarbosaurus efremovi. [8]