I've already responded to this via PM, but in an attempt to stay on topic in the forum, let me ask this. What astronomical dating methods -- if any -- do scientists normally use for purposes of dating?
This may not be exactly what you are looking for, but many have argued that the
Milankovitch cycles are responsible for the cyclic nature of global climate. So there is a possible linkage between the temperature proxies in polar ice layers and the changes in Earth's tilt and orbit.