The same system exists in seawater, wherever 44Ca/40Ca tends to rise when the speed of removing of Ca2+ by mineral precipitation exceeds the enter of recent calcium to the ocean. In 1997, Skulan and DePaolo introduced the 1st evidence of change in seawater 44Ca/40Ca around geologic time, along with a https://trevorwjjif.blogzet.com/a-review-of-cad-drawings-in-irvine-42872495