We found veins of hematite and quartz that both cut through Tava dikes and were crosscut by Tava dikes. That allowed us to figure out an age bracket for the sand injectites, which must have formed ...
The Tava is also cross-cut by silvery-gray veins of iron oxide ... to reveal how long ago the individual crystals formed. The iron veins appear to have formed both before and after the sand was ...
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