A similar system exists in seawater, the place 44Ca/40Ca has a tendency to increase when the rate of elimination of Ca2+ by mineral precipitation exceeds the input of new calcium in the ocean. In 1997, Skulan and DePaolo offered the main evidence of adjust in seawater 44Ca/40Ca around geologic time, https://louisaxyxu.isblog.net/little-known-facts-about-environmental-hazardous-materials-in-santa-ana-45322822