1. Bandy OL, Arnal RE (1957) Distribution of recent Foraminifera off the west coast of Central America. Bull Am Assoc Petrol Geol 41:2037–2053
2. Beese D (1995) (unpublished). Zur Rekonstruktion des Paläoklimas im Golfo Dulce, Costa Rica anhand der stabilen Isotopen-verhältnisse in Foraminiferen- und Pteropodenschalen. Diploma. Teil 2 (Lab.) Fachber. Geow., Universität Bremen, 41 p
3. Brusca RC, Brusca GJ (2003) Invertebrates, 2nd ed. Sinauer Assoc, Sunderland, MA, p. 936
4. Cassell DT, Sen Gupta BK (1989) Pliocene Foraminifera and environments, Limon, Costa Rica. J Paleont 63:146–157
5. Collins LS (1996) Environmental changes in Caribbean shallow waters relative to the closing Tropical American Seaway. In: Jackson JBC, Budd AF, Coates AG (eds) Evolution andEnvironment in Tropical America. University of Chicago Press, Chicago, pp 130–16