Quartz is a mineral not a rock. Fossils can be found associated with quartz in sedimentary rock not inside the quartz.
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You can find quartz by digging in rocky areas you can find quartz almost everywhere in the world Click the link to learn more!
If the rocks containing the fossils have been involved in a mountain building episode they would be folded and if some of the folds were laid in a recumbent position and later eroded you would have older above younger rocks. Of course, it would be easy to find out if this was the case because of the various sedimentary structures in each separate layer of rock.
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yes
during heat prusure and time it changers from quartz to smoky quartz