Foraminifera source details
Lamb, J. L. (1969). Planktonic foraminiferal datums and late Neogene epoch boundaries in the Mediterranean, Caribbean, and Gulf of Mexico. Transactions of the Gulf-Coast Association of Geological Societies. 19: 559-578.
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Lamb, J. L. (1969). Planktonic foraminiferal datums and late Neogene epoch boundaries in the Mediterranean, Caribbean, and Gulf of Mexico. Transactions of the Gulf-Coast Association of Geological Societies. 19: 559-578
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Sphaeroidinellopsis sphaeroides Lamb, 1969 † (original description)