Marinka: In March 2005 arrinta of Science, Mary Higby Schweitzer of North Carolina State University iyo asxaabteeda ku dhawaaqay dib u soo kabashada ee unugyada jilicsan ka godka marinka ee lafaha lugta fossilized ka Tyrannosaurus rex. lafaha ayaa si ula kac ah, inkasta oo diidmo, jebiyey for maraakiibta ka dibna aan la ilaaliyo habka caadiga ah, gaar ahaan maxaa yeelay Schweitzer rajeynayay in ay tijaabiso unugyada jilicsan. magacaabay sida Museum of Rockies shaybaarka 1125, ama MOR 1125, dinosaur ayaa hore loo qoday ka Hell Creek Formation. dabacsan, xididdada dhiigga bifurcating iyo unugyada unugyada fiber laakiin jilicsan la aqoonsan yahay. Intaa waxaa dheer, microstructures u eg unugyada dhiigga laga helay gudaha xididdada iyo unugyada dhiigga.
lafaha