Folks interested in this unusual combination may also be interested in the use of particle tracks to date geological samples > "Techniques for geological datin

Folks interested in this unusual combination may also be interested in the use of particle tracks to date geological samples > "Techniques for geological dating of minerals by chemical etching of fission fragment tracks" > http://www.sciencedirect.com/science/article/pii/0016703764900171 http://www.sciencedirect.com/science/article/pii/00167037649... and the even more surprising case of using ancient rocks as particle detectors with extremely large exposure times (> 1B yr) > "Unique Signature of Dark Matter in Ancient Mica" > https://arxiv.org/abs/astro-ph/9701215 https://arxiv.org/abs/astro-ph/9701215