The fossil in question was generally regarded to be the 220 million year-old remains of Tyrannosaurus. Several years ago, however this hypothesis was overturned by the discovery of yet another species [Morehouse, 1993 #6] which is now considered to be the descendent of the species at hand [Argus, 1991 #11; Turnhouse, 1987 #4]. While the true origin of this larger reptile is quite uncertain at this time, it is thought to be from central or eastern Asia.
Where the other species arose is a mystery [Schwartz, 1990 #5]. If it was central Asia, we could reasonably infer that other reptiles were not dominant in this ecosystem. Some think that we will never know [Billoski, 1987 #7; Schwartz, 1976 #9; Whiting, 1987 #1]. However, fossils currently in the museum in Berlin provide strong evidence that the emerging reptile was small-boned and duck-billed [Whiting, 1987 #1], possibly with a larger wing-like arm.
