000 00281nam a2200097 4500
100 _aUniversity of Chicago
245 _aJournal of Geology, vol.LXXIII, Nos.1-6
_cUniversity of Chicago
260 _aUniversity of Chicago
_c1965
260 _aUniversity of Chicago
_c1965
942 _cCR
999 _c335215
_d335215