GEOLOGICAL SURVEY AaUNDANCE AND DIST.RIBUTION OF URANIUM AND THORIUM IN ZIRCON,

Trace Elements Investigations Report 636 This pre.limi:nary report is distributed. without editorial and technical review for conformity with official standards a.n.d nomencl?-ture., It is not f'or public inspection or quotation. *This report concerns work done partly on behalf.of ' the Divis ion. of Research of the U. S •.Atomic Energy.Commission.. 2 GEOLOGY.ANll. MINER.Al.OGY Distribution l _- ' _. · , No t> of _copies ltomie. 'Energy.- ' c Otrllnis's i~n ' _Wa.shington " " •: • • • • , • · • _If>... e. 0 • ~ _.If •• • " ' • 0 • •.. • 2 Di'vi.sion. of '.Raw Materials ' ~lbuquer.que • • ill...- ~- ~.eo ••••. •• • G. • eo e P- 1 DiviSion of ' Raw Materials ·, Austin ~ *...................:-. • •:'- '., •• • ~ e 1 Di vi.s ion of RaJ ( Materials ' Caspe.r- e • • ir ••• • , • • • 0 • 0 ••••• • R · • • 0 • • • I l Division o:f Raw Materiatls, Denver ••••.•• • • ••• • · ~ • • o., ·!J ' • • o.!il... •.·? 1 Divis ion of Raw:Materials, Ishpeming..... i>- • o •• • o •••• • o _ •• • ~ • • • •