Sangiran 2 is an adult Homo erectus calvaria lacking much of the cranial base and the entire face. Because its cranial sutures are fused endo- and ectocranially, it is considered to have been older at the time of its death than other Sangiran hominids except Sangiran 4 [2][3][4][5].

It was previously placed at just below Middle Tuff in the Bapang Formation [2][6], but should be relocated to the Grenzbank zone based on bone fluorine content [7] and a geological resurvey of the find site [8][9]. Placing Sangiran 2 at Grenzbank zone would give it a date of ~0.9 Ma, since Grenzbank is securely anchored at ~0.9 Ma [10].