Geology of the middle Tertiary formations of Puerto Rico

Professional Paper 953



Rocks of Oligocene and Miocene age crop out in both N and S Puerto Rico. They rest with angular unconformity on volcanic and related sedimentary and intrusive rocks that range in age from Early Cretaceous to M. Eocene. The older rocks crop out on the upland that extends E-W through the center of the island. The surface on which the M. Tertiary rocks were deposited is very irregular, having a local relief of at least 200m. Although the rocks of N and S Puerto Rico are approximately the same age, there was no nearby marine connection during Oligocene time; as a result, neither the lithologic characteristics nor the faunas contained in the rocks permit exact correlation from one side of Puerto Rico to the other. During Miocene time, there may have been a connection of the two seas around the W end of present-day Puerto Rico. -from Author

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Geology of the middle Tertiary formations of Puerto Rico
Series title Professional Paper
Series number 953
DOI 10.3133/pp953
Year Published 1980
Language English
Publisher U.S. Government Printing Office
Description Report: 93 p.; 1 Plate: 53.00 x 38.00 inches
Country United States
State Puerto Rico
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