Chiasmolithus species in middle Eocene and Oligocene sediments of ODP Holes 105-647A and 120-748B, supplement to: Firth, John V; Wise, Sherwood W (1992): A preliminary study of the evolution of Chiasmolithus in the middle Eocene to Oligocene of Sites 647 and 748. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 493-508

John V Firth & Sherwood W Wise
In this preliminary biometric study of the calcareous nannofossil species Chiasmolithus expansus, Chiasmolithus oamaruensis, and Chiasmolithus altus from the upper middle Eocene to lower Oligocene of Sites 647 and 748, we document a complete gradation of forms among all three species. Chiasmolithus oamaruensis has significantly higher morphologic variance than the other species. The Chiasmolithus population at each site changes from C. expansus to C. oamaruensis and then to C. altus. This may not reflect a...
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