The expression “Old as the hills” means really, really old when you’re referring to #JackHills in Western Australia.

How old are they? They’re so old that isotopic analysis of zircon rocks 🪨 found there indicate that they were formed BEFORE tectonic activity on Earth 🌏 began! 👉 https://www.si.edu/newsdesk/releases/earths-oldest-minerals-date-onset-plate-tectonics-36-billion-years-ago

This fascinating result of #geochemistry agrees with the second oldest rocks on Earth from the Canadian Shield.

I love the timeline diagram in here. https://www.iflscience.com/at-44-billion-years-old-this-is-the-oldest-piece-of-earth-ever-found-68469 #zircon #geology #science #minerals #Australia #JackHills