An analogous method exists in seawater, the place 44Ca/40Ca has a tendency to rise when the speed of removing of Ca2+ by mineral precipitation exceeds the input of latest calcium in the ocean. In 1997, Skulan and DePaolo presented the initial proof of change in seawater 44Ca/40Ca above geologic time, https://local-air-quality-in-irvi15049.blogsvirals.com/27736492/cad-drawings-in-irvine-no-further-a-mystery