USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1990-023-FA

Other ID: none

Status: Completed

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

Funding Program(s):

Principal Investigator(s): Eugene A. Shinn

Affiliate Investigator(s): Dr. Albert C. Hine, USF

Information Specialist(s):

Data Type(s): Sonar: Sidescan, Seismics: Boomer, Seismics: Sparker, Sonar: Single Beam, Biological Field Study: Experiments, Visual Identification: Ground Truthing, Location-Elevation: Navigation

Scientific Purpose/Goals: To determine: if there are strategraphic sequences seaward of the Florida Keys reef tract that would indicate the occurrence of previous (Pleistocene) sea-level stands (preliminary perusal of data suggests there are); if this bank margin has features similar to other windward carbonate margins of the Bahamas, i.e., is there offbank/downslope sand export opposite a well-developed section of the shallow reef; if there are relatively sediment-starved sections along the upper slope where gaps occur in the shallow reef; if there is a sedimentalogic response along the upper slope to gaps in the Florida Key island tract; the dominant sediment type and rate of sediment accumulation along the upper slope; the existence of submarine cementation along the upper slope in response to the activity of the Florida current; the extent of downslope sediment movement by mass transfer mechanisms or by sediment gravity flows; the existence of gullies/small canyons within the upper 200 m of water depth; and the size, morphology, and extent of multiple, seaward reef tracts.


Start Date: 1990-07-28

Start Port/Location: St. Petersburg, FL

End Date: 1990-08-04

End Port/Location: St. Petersburg, FL

Equipment Used: Sidescan sonar, EG&G Model 260 sidescan sonar, ORE GeoPulse, Sparker system, Echosounder, Corer - slow, Mooring tripod, Loran-C

Information to be Derived:

Summary of Activity and Data Gathered: Approximately 525 km of seismic profiles, 81 km of 300-m sidescan, and 22 km of 600-m sidescan sonar profiles were acquired, and 31 Shipek surface sediment samples were taken along 4 transects. These data supplement the 500 km of high-resolution seismic profiles obtained in the same area in July 1989.

Staff: Eugene A. Shinn, Barbara H. Lidz

Affiliate Staff:
Albert C. Hine
USF; Stanley Locker
USF; 8 USF Students



Shelf margin edge off lower Florida Keys, Florida, Gulf of Mexico, United States, North America, North Atlantic;

North: 24.81665 South: 23.99629 West: -81.925 East: -79.69482


photo of Suncoaster



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Sidescan sonar --- Sidescan
EG&G Model 260 sidescan sonar --- Sidescan
ORE GeoPulse --- Boomer
Sparker system --- Sparker
Echosounder --- Single Beam
Corer - slow --- Geology
Mooring tripod --- Ground Truthing
Loran-C --- Navigation