USGS Coastal and Marine Geology Program

Coastal & Marine Geology Program

Field Activity Details for field activity 1978-012-FA

Other ID: none

Status: Completed

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

Funding Program(s):

Principal Investigator(s): David Twichell

Affiliate Investigator(s):

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Boomer, Sonar: Sidescan

Scientific Purpose/Goals: Map the surface character, thickness and extent of the Mud Patch sediment lens to define the origin and present processes responsible for the development of this anomalous sediment deposit.


Start Date: 1978-05-15

Start Port/Location: Atlantic City, NJ

End Date: 1978-05-20

End Port/Location: Atlantic City, NJ

Equipment Used: Klein 531 sidescan, Loran-C, Boomer, Single channel hydrophone

Information to be Derived: Sea floor map;

Summary of Activity and Data Gathered: No sidescan lines 1-5; equipment problems. Huntec boomer: 941 km; Klein sidescan sonar: 673 km; EDO Western 60 kHz echo sounder: 941 km.

Staff: Barry Irwin, David Twichell

Affiliate Staff:
Univ. Delaware students: Dennis Bebel
Tom Crosby
Kathy Kent
Gary Snyder
Marion Swincki; Offshore Navigation
Inc. technicians: John Barnard
Mike Coster
Larry Matson; Huntec technician: Dave Tullett; US Navy engineer: Nathan (Bing) Fuller

Notes: Original Center People field contained: Dave Twichell - Ch. Sci., Barry Irwin.


Block Canyon, Atlantis Canyon, Mud Patch, southern New England continental shelf, United States, North America, North Atlantic;

North: 40.8 South: 39.9 West: -71.95 East: -69.95


photo of Cape Henlopen
Cape Henlopen


Twichell, D.C., 1980, Single-channel seismic-reflection profiles and sidescan sonar records collected during May 15-20, 1978, on the southern New England continental shelf: 2, download PDF.


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Klein 531 sidescan --- Sidescan
1978-012-FA-SO-002 ( microfilm of )
1978-012-FA-SO-001 ( Collection of paper record displays of sidescan sonar data for lines )
Loran-C --- Navigation
1978-012-FA-LN-001-01 ( Track map with tracklines, dates and times.)
1978-012-FA-NL-001-04 ( Navigation Log (pdf file) Bridge Loran log.)
Boomer --- Boomer
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1978-012-FA-SE-001 ( microfilm of )
1978-012-FA-NL-001-03 ( Seismics log.)