Rb-Sr

Noun

 * 1) rubidium-strontium.
 * 2) * 2012, Wolfe AP, Csank AZ, Reyes AV, McKellar RC, Tappert R, et al., "Pristine Early Eocene Wood Buried Deeply in Kimberlite from Northern Canada", PLoS ONE 7(9): e45537. doi:10.1371/journal.pone.0045537:
 * The age of the Panda intrusion has been dated precisely by Rb-Sr determinations on kimberlitic phlogopite (n = 7), yielding a robust isochron of 53.3±0.6 Ma (Early Eocene, Ypresian).