000 00279nam a2200097 4500
100 _aUniversity of Chicago
245 _aJournal of Geology, vol.LXXIV Nos.1-6
_cUniversity of Chicago
260 _aUniversity of Chicago
_c1966
260 _aUniversity of Chicago
_c1966
942 _cCR
999 _c335216
_d335216