Calcium glut may have hardened marine life.
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References
Brennan, S. T., Lowenstein, T. K. & Horita, J. Geology, 32, 473 - 476, doi:10.1130/G20251.1 (2004).
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Ball, P. Sea change for first shells. Nature (2004). https://doi.org/10.1038/news040607-1
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DOI: https://doi.org/10.1038/news040607-1