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Minerals excavated from the Earth's crust contain gigayear-long astroparticlerecords, which can be read out using acid etching and microscopy, providingunmatched sensitivity to high mass dark matter. A roughly millimetre size slabof 500 million year old muscovite mica, calibrated and analyzed by Snowden-Ifftet al.~in 1990, revealed no signs of dark matter recoils and placed competitivelimits on the nuclear interactions for sub-TeV mass dark matter. A differentanalysis of larger mica slabs in 1986 by Price and Salamon searched forstrongly interacting monopoles. After implementing a detailed treatment ofEarth's overburden, we utilize these ancient etched mica data to obtain newbounds on high mass dark matter interactions with nuclei.

Old Rocks, New Limits: Excavated Ancient Mica Searches For Dark Matter