. Bulletins of American paleontology. Unnamed Fm Sharii Hole Fm Nancy Poinl Fm Tobabe Fm Volcaniclastlcs Reef patches Basalt flows Pyroclastics Flow breccia Foraminiferal mudstone Bocas del Toro Group Volcanic Arc System Bathyal Sediments NW SE Volcanic Arc Sequence Valiente Peninsula ^-4- Avispa Point Nancy Point Bocas del Toro Group Cheng Shark Hole Point Point I. Text-figure 8.—a. Schematic geologic cross section along the north coast of Bastimentos Island showing younger unnamed formations of the Bocas del Toro Group unconformably overlying the volcanic arc deposits, b. Schematic geologic
. Bulletins of American paleontology. Unnamed Fm Sharii Hole Fm Nancy Poinl Fm Tobabe Fm Volcaniclastlcs Reef patches Basalt flows Pyroclastics Flow breccia Foraminiferal mudstone Bocas del Toro Group Volcanic Arc System Bathyal Sediments NW SE Volcanic Arc Sequence Valiente Peninsula ^-4- Avispa Point Nancy Point Bocas del Toro Group Cheng Shark Hole Point Point I. Text-figure 8.—a. Schematic geologic cross section along the north coast of Bastimentos Island showing younger unnamed formations of the Bocas del Toro Group unconformably overlying the volcanic arc deposits, b. Schematic geologic cross section from the western tip of the Valiente Peninsula to Shark Hole Point, showing the volcanic arc deposits unconformably overlain by the older units of the Bocas del Toro Group. Peninsula. Assuming a constant dip (the type Tobabe and Nancy Point Formations have the same strike and dip), 400 m of section are not exposed. Much of this missing interval is exposed on the southern coast of the Valiente Peninsula between Warrie Point and the southern headland of the small peninsula of Toro Point (Map 5), and is diagrammed in Section 15. Litholog- ically it appears to be more typical of the Nancy Point Formation. Strata! relations.—The Nancy Point Formation is conformable with the Tobabe Formation below and the Shark Hole Point Formation above (Text-fig. 8b). Lithology.—The Nancy Point Formation consists of massive, pervasively bioturbated, shelly, muddy and silty sandstone, muddy siltstone, with scattered mol- lusks and occasional leaves and plant fragments, and occasional coarse volcaniclastic and bioclastic sand- stone beds. There are several low-diversity shell beds (Section 15) near the base and several diverse mod- erately abundant molluscan assemblages throughout the section. The base of Section 15, on the south coast of the Valiente Peninsula has a faulted contact with the underlying volcanics so that no typical Tobabe Sand- stone crops out. The transition from
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