USGS - science for a changing world

USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1977-005-FA

Other ID: 77-02; 77-5

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): James V. A. Trumbull

Affiliate Investigator(s): Orrin Pilkey

Information Specialist(s):

Data Type(s): Biological Field Study: Experiments, Seismics: Sub Bottom Profiler, Location-Elevation: Navigation

Scientific Purpose/Goals: Investigate submarine canyon off Rio de la Plata, north coast of Puerto Rico: coring, seismics, and bathymetry.


Start Port/Location:

End Port/Location:

Start Date: 1977-02-14

End Date: 1977-02-16

Equipment Used: 3.5 kHz, Corer - slow, Raytheon radar

Information to be Derived: Morphology;

Summary of Activity and Data Gathered: Ewing piston cores: 12; 3.5 kHz: 40 km. Cores obtained from canyon flanks and axis on shelf and slope. Flanks mostly clay with pelagic organisms but many terrigenous sand beds throughout penetration of 20 feet. Semi-indurated probably Tertiary clay and bent pipe in axial attempts. Seismic quality poor but inter-canyon sediments clearly unconformable on apparently smooth surface near axial depth of canyon. 3.5 kHz good for selecting coring locations. Bathymetry and seismics to be compiled/interpreted in San Juan. Cores stored in San Juan. Core cuts to be analyzed at Duke.

Staff: James V. A. Trumbull

Affiliate Staff:
Orrin Pilkey - USGS and Duke Univ.; Students from Duke and University of North Carolina

Project = Puerto Rico Project, Puerto Rico Project


Rio de la Plata Canyon, Puerto Rico, United States, North America, North Atlantic;

North: 18.65 South: 18.45 West: -66.35 East: -66.2


photo of Eastward



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Corer - slow --- Geology
3.5 kHz --- Sub Bottom Profiler
Raytheon radar --- Navigation

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
Questions or Comments? Contact CMGDS Team