Shamrock, J. L. (2010). A new calcareous nannofossil species of the genus Sphenolithus from the Middle Eocene (Lutetian) and its biostratigraphic significance. Journal of Nannoplankton Research. 31(1), 5-10.
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Shamrock, J. L.
2010
A new calcareous nannofossil species of the genus Sphenolithus from the Middle Eocene (Lutetian) and its biostratigraphic significance