000			00217nam a2200097 4500
100			_aGSA,
245			_aBullettin of Geol. Soc. America,vol.86(1-6) _cGSA,
260			_aGSA, _c1975
260			_aGSA, _c1975
942			_cCR
999			_c336188 _d336188