A similar procedure exists in seawater, wherever 44Ca/40Ca has a tendency to rise when the rate of elimination of Ca2+ by mineral precipitation exceeds the enter of latest calcium in to the ocean. In 1997, Skulan and DePaolo introduced the first proof of change in seawater 44Ca/40Ca above geologic time, https://ca94826.topbloghub.com/34344960/getting-my-environmental-hazardous-materials-in-santa-ana-to-work