An identical procedure exists in seawater, where by 44Ca/40Ca has a tendency to rise 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 first evidence of alter in seawater 44Ca/40Ca over geologic time, https://environmental-compliance63849.timeblog.net/63980371/what-does-environmental-hazardous-materials-in-santa-ana-mean