Table 3. Stratigraphic and geographic locations of Bothrocorbula and Hexacorbula samples. If a unit spans an epoch boundary, it is listed in both. A "?" indicates provisional placement in an epoch.

EPOCH (Age)	Greater Antilles	Venezuela	Costa Rica	Panama, Colombia
Holocene
Upper Pleistocene
Middle Pleistocene
Lower Pleistocene (Calabraian)
Upper Pliocene (Gelasian)
Upper Pliocene (Piacenzian)	Bowden		Rio Banano
Lower Pliocene (Zanchlean)	Gurabo			Tubara?
Upper Miocene (Messinian)	Gurabo			Tubara?
	Cercado
Upper Miocene (Tortonian)	Cercado	Buenevara Adentro		Gatun
Middle Miocene (Serravalian)		Buenevara Adentro		Gatun
Middle Miocene (Langhian)		Lagunillas?
	Baitoa	Cantaure
Lower Miocene (Burdigalian)	Baitoa	Cantaure
Lower Miocene (Aquitanian)