"B-rex": MOR 1125 Specimens of Tyrannosaurus

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reconstructed skull of b-rex


this specimen found in lower portion of hell creek formation near fort peck lake in charles m. russell national wildlife refuge in garfield county, montana. discoverer bob harmon, fossil preparer museum of rockies, , nicknamed b-rex (or bob-rex ) in honor of harmon. specimen discovered in 2000, , excavated mor 2001 2003. although 37 percent of skeleton present, included of skull (although skull disarticulated). specimen includes several cervical, dorsal, sacral, , caudal vertebrae; several chevrons; cervical , dorsal ribs; left scapula , coracoid; furcula; left ulna; both femora, tibiae, , ulnae; right calcaneum; right astragalus; , number of pes phalanges.



femur of mor 1125 demineralized matrix , peptides (insets) obtained


in march 2005 science magazine, mary higby schweitzer of north carolina state university , colleagues announced recovery of soft tissue marrow cavity of fossilized leg bone (a 1,15 m long femur), 68-million-year-old tyrannosaurus. bone had been intentionally, though reluctantly, broken shipping , not preserved in normal manner, because schweitzer hoping test soft tissue. designated mor 1125 (and known informally b-rex), dinosaur had been excavated hell creek formation. flexible, bifurcating blood vessels , fibrous elastic bone matrix tissue recognized. in addition, microstructures resembling blood cells found inside matrix , vessels. structures bear resemblance ostrich blood cells , vessels. however, since unknown process distinct normal fossilization seems have preserved material, researchers being careful not claim original material dinosaur. if found original material, surviving proteins may used means of indirectly guessing of dna content of dinosaurs involved, because each protein typically created specific gene. absence of previous finds may merely result of assumptions soft tissue not preserved, nobody had looked it. since first, 2 more tyrannosaurs , hadrosaur have been found have such tissue-like structures.


paleontologist thomas kaye of university of washington in seattle has hypothesized soft-tissue permineralized biofilm created bacteria while digesting , breaking down original specimen. has discovered true in many specimens same area.


in 2016, confirmed mary higby schweitzer , lindsay zanno et al soft tissue medullary bone tissue, in modern birds when readying lay eggs. confirmed identity of tyrannosaurus mor 1125 female. discovery of medullary bone tissue within tyrannosaurus may prove valuable in determining sex of other dinosaur species in future examinations.








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