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The Cretaceous Uhangri Formation, southwest Korea, is a lacustrine sequence surrounded by acidic volcanic terrain and comprises sandstone/chert and laminated chert/black shale couplets in the upper part. In both cases, the Uhangri chert is composed mainly of SiO 2 (74-81%), Al 2 O 3 (10-12%) and K 2 O (6-7%). Its impure nature is largely due to the presence of feldspar...
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