weekly fossil

Giganotosaurus carolinii was named for Ruben Carolini, an amateur fossil hunter who, in 1993, discovered the fossils in deposits of Patagonia (southern Argentina) in what is now considered the Candeleros Formation.^[2] The initial description was published by Rodolfo Coria and Leonardo Salgado in the journal Nature in 1995.^[4]

The holotype specimen's (MUCPv-Ch1) skeleton was about 70% complete and included the skull, pelvis, leg bones and most of the backbone. Various estimates find that it measured somewhere between 12.2 and 13 m (40 and 43 ft) in length, and between 6.5 and 13.3 tons in weight.^[5][6][7] A second, more fragmentary, specimen (MUCPv-95) has also been recovered. It is only known from a portion of the left dentary which is 8% larger than the equivalent bone from the holotype. This largest Giganotosaurus specimen is estimated to represent an individual with a skull length of 195 cm (6.40 ft), compared to the holotype's estimated at 1.80 m (5.9 ft) skull, making it likely that Giganotosaurus had the largest skull of any known theropod.^[8] Giganotosaurussurpassed Tyrannosaurus in mass by at least half a ton (the upper size estimate for T. rex is 9.1 t).^[7]
http://en.wikipedia.org/wiki/Giganotosaurus