CRETACEOUS INTRA-ARC SUMMIT BASIN ON PUERTO RICO

D.K. LARUE
Dept of Geology. University of Puerto Rico,
Mayaguez, PR 00708
P. PIERRE
Dept of Geology, U.C. Davis, Davis CA 95616
J. ERIKSON
Dept of Geology, Dartmouth College, NH 03755


Studies of Late Cretaceous depositional systems in southwest Puerto Rico reveal the presence of an intra-arc basin, separated on the southwest and northeast by arc platforms. The trend of the basin axis is poorly defined, but may run northwest across central Puerto Rico, parallel to regional structural trends. The basin is filled mailnly with volcaniclastic turbidities, equivalent in age to arc platform volcanic rocks and shallow-water limestone fades.

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