The same program exists in seawater, where by 44Ca/40Ca has a tendency to increase when the speed of removing of Ca2+ by mineral precipitation exceeds the input of recent calcium in the ocean. In 1997, Skulan and DePaolo presented the 1st proof of change in seawater 44Ca/40Ca around geologic time, https://waterqualitycontrolplansi96396.mpeblog.com/51261755/the-greatest-guide-to-hazardous-materials-management-in-irvine