An identical procedure exists in seawater, in which 44Ca/40Ca tends to rise when the speed of removal of Ca2+ by mineral precipitation exceeds the enter of latest calcium in the ocean. In 1997, Skulan and DePaolo offered the first evidence of adjust in seawater 44Ca/40Ca in excess of geologic time, https://water-quality-compliance18417.weblogco.com/28186777/the-5-second-trick-for-ca