RRS Discovery D47

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD47
Cruise period1972-06-09 — 1972-07-03
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
Objectives1) To intensively sample the outcrop geology of the shallower banks on the Rockhall Plateau.

2) Sampling in-situ rocks, superficial sediments and the use of asdic for structural mapping of the outcrops and observation of sediment distribution patterns.

3) To continue seismic profiling on all passage tracks using Bolt-Air guns and in the shallow water areas to obtain high resolution seismic profiles using the ORE 3.5kHz seismic profiler.

4) Side-scan sonar was carried for continuous operation asa narrow beam echo-sounder in the deeper water areas and for use as a support for bottom sampling and sediment distribution studies in all depths less than 300 fathoms

5) Magnetics and depth data were to be obtained on all tracks
Chief scientistDavid G Roberts (National Institute of Oceanography)
Cruise reportRRS Discovery D47 cruise report d47.pdf (0.89 MB)  RRS Discovery D47 cruise report d47_data_report.pdf (3.67 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
Track chartsRRS Discovery D47 cruise track — d47track.pdf (0.05 MB) 
Physical oceanography 
Water bottle stationsDescription: T surface only
Instrumented wave measurements
Occasional standard measurements
Other meteorological measurementsDescription: sea and swell
Geology and geophysics 
DredgeQuantity: number of deployments = 30
Core - rockQuantity: 16
Description: 2 drilling holes
Bottom photographyQuantity: 4
Multi-beam echosounding
Long/short range side scan sonarDescription: 11 days
Single channel seismic reflectionQuantity: track kilometres = 4135
Magnetic measurements