An identical technique exists in seawater, where 44Ca/40Ca has a tendency to rise when the speed of removal of Ca2+ by mineral precipitation exceeds the enter of new calcium in to the ocean. In 1997, Skulan and DePaolo presented the initial proof of change in seawater 44Ca/40Ca above geologic time, https://environmental-compliance86420.mpeblog.com/51263936/new-step-by-step-map-for-toxic-hazardous-waste-in-santa-ana