. Bulletins of American paleontology. Paleoenvironments: Collins et al. 83 > I- ILI I CQ o LU _J S. 500 PANAMA CANAL BASIN Chagres, Gatun Rio Indio 400- 300- 200 100-. FORMATIONS BOCAS DEL TORO BASIN Cayo Agua Swan Escudo de Cay Veraguas Nancy Point "'I LIMON BASIN Mom, Rio Lomas Mom, Banano del Mar type I I TAXA benttiic foraminifera ahermatypic corals ostracodes teleost fish Overlap (m): 15-40 50-80 37-46 80-100 100-150 300-500 20-40 50-75 150-250 Texl-figure 1.—Paleobattiymelric comparison of members or formations (columns) of the Panama Canal, Bocas del Toro. and Limon basins using
. Bulletins of American paleontology. Paleoenvironments: Collins et al. 83 > I- ILI I CQ o LU _J S. 500 PANAMA CANAL BASIN Chagres, Gatun Rio Indio 400- 300- 200 100-. FORMATIONS BOCAS DEL TORO BASIN Cayo Agua Swan Escudo de Cay Veraguas Nancy Point "'I LIMON BASIN Mom, Rio Lomas Mom, Banano del Mar type I I TAXA benttiic foraminifera ahermatypic corals ostracodes teleost fish Overlap (m): 15-40 50-80 37-46 80-100 100-150 300-500 20-40 50-75 150-250 Texl-figure 1.—Paleobattiymelric comparison of members or formations (columns) of the Panama Canal, Bocas del Toro. and Limon basins using four different taxa. Shading denotes the overlap in depth ranges shown across the bottom. were used in the foraminiferal analyses, whereas the presence vs. absence of taxa was used for ostracodes. The use of paleoenvironmental methods with aher- matypic corals is similar to those with microfossils in that they are at the species level and use the overlap of bathymetric ranges. However, specimens are too large and sparsely distributed to make determinations for single samples, so bathymetric ranges of taxa from multiple samples of each formation or section are com- bined into one paleoenvironmental analysis. This method carries the assumption that the depositional en- vironment did not change within the formation/section, which was generally supported in this case by previ- ously published results for separate samples (Collins et al., 1995). Extinct taxa in the analyses (only about 20% of the ahermatypic coral species are extant) were compared to closely related living species for about 30% of the taxa. Paleoenvironmental analysis of teleost otoliths was standardized by Nolf and Brzobohaty (1992) and dif- fers from the methods used for the other taxa. Taxo- nomic identifications of fish from otoliths are generally at the generic level. Approximately 98% of the fossil genera are extant. Relative abundances of genera are calculated per 100-m-depth interval and the interval in w
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