For ancient deep-sea plankton, a long decline before extinction
University of Buffalo, Press release by Charlotte Hsu
Sheets, H.D., Mitchell, C.E., Melchin, M.J., Loxton, J., Štorch, P.,
Carlucci, K.L. and Hawkins, A.D., 2016. Graptolite community
responses to global climate change and the Late Ordovician
mass extinction. Proceedings of the National Academy of
Sciences, 113(30), pp.8380-8385.
Researchgate PDF for above paper
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Paul H.