Ọ bụ otu n'ime dinosaur ndị a kacha mara amara n'oge niile ma nwee nnukwu akụkọ ihe mere eme. Mgbe mbụ a chịkọtara ọkpụkpụ ahụ, a na-egosipụta ya na okpokoro isi plaster nke Hawkins kpụrụ. Ọtụtụ ndị na-ese ihe ndị ọzọ ejirila okpokoro isi sitere na ndị ọzọ, ụdị ndị metụtara ya dị ka Gosaurus na Brachrypylophosaurus. Ihe oyiyi nke Hadrosaurus, nke onye Haddonfield bi na John Giannotti kpụrụ, na-eguzo ugbu a na etiti obodo Haddonfield, na-echeta nchọpụta ya ebe ahụ. Ajụjụ: Mgbe a kpọrọ Hadrosaurus fosil steeti ọhụrụ nke jersey?
Afọ 1994