USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1985-031-FA

Other ID: DISC-85-2

Status: Completed

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

Funding Program(s):

Principal Investigator(s): Stephen Colman

Affiliate Investigator(s): Jeff Halka - Maryland Geological Survey (MGS)

Information Specialist(s):

Data Type(s): Seismics: Boomer, Seismics: Air Gun / Water Gun, Seismics: Bubble Gun, Seismics: Sparker, Seismics: Sub Bottom Profiler, Sonar: Sidescan, Location-Elevation: Navigation

Scientific Purpose/Goals: Collect high-resolution seismic reflection and sidescan sonar data in order to define the geology and shallow structure of the Chesapeake Bay.


Start Date: 1985-09-17

Start Port/Location:

End Date: 1985-09-24

End Port/Location:

Equipment Used: ORE GeoPulse, Del Norte hydrophone, Datasonics SST 220 sub-bottom 3.5k, EG&G Model SMS 960 Seafloor Mapping System, Northstar 6000 LORAN-C

Information to be Derived:

Summary of Activity and Data Gathered: The cruise was quite successful, despite being cut three days short because of Hurricane Gloria. A total of 280 nm (518 km) of tracklines was covered. Except for the hurricane, weather was excellent with several flat-calm days. The seismic reflection records obtained were very good except in local areas where the sediments contained biogenic gas. Penetration achieved by the seismic signals was mostly 100 msec or more, and the records clearly show the entire Quaternary and upper part of the Tertiary sequence of deposits. Multiple overlapping channels and channel-fill deposits related to major fluctuations in sea level were observed.

Staff: Stephen Colman, Monica Webster, John West

Affiliate Staff:
Jeff Halka
Chief Scientist; Woody Hobbs

Notes: Original Center People field contained: Steve Colman, Chief Scientist; Monica Webster, GFA; John West, Technician.
Project = Geology of Chesapeake Bay, Geology of Chesapeake Bay


central Chesapeake Bay, United States, North America, North Atlantic;

North: 38.18 South: 37.7 West: -76.25 East: -75.6


photo of Discovery



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
ORE GeoPulse --- Boomer
Del Norte hydrophone --- Air Gun / Water Gun
Bubble Gun
1985-031-FA-SE-002 ( microfilm of )
1985-031-FA-SE-001 ( Collection of paper record displays of seismic data( GEOP) for lines )
1985-031-FA-SE-003 ( analog tape of seismic data)
Datasonics SST 220 sub-bottom 3.5k --- Sub Bottom Profiler
EG&G Model SMS 960 Seafloor Mapping System --- Sidescan
1985-031-FA-SO-001 ( microfilm of )
Northstar 6000 LORAN-C --- Navigation
1985-031-FA-LN-002 ( Digital tape(s) of NV, )
1985-031-FA-LN-001-01 ( Composite trackline map with line numbers, dates and times for DISCOVERY 85-2 (FA 85031) and DAN MOORE/DISCOVERY 86-1 (FA 86022).)