Cruise inventory

RRS John Murray JM1/68 Leg 2

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS John Murray (74MJ)
Cruise identifierJM1/68 Leg 2
Cruise period1968-01-18 — 1968-01-29
StatusCompleted
Port of departureBilbao, Spain
Port of returnLas Palmas, Spain
PurposeResearch
ObjectivesAims

1. Reconnaissance - geochemical/geological investigations of the NW African Shelf
2. refraction, seismic and other geophysical studies in the Canaries.
Chief scientistJ S Tooms (Imperial College London Department of Geology)
Cruise reportRRS John Murray JM1/68 Leg 2 cruise report john_murray1_68.pdf — access key 'C' (12.08 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorth West Africa Shelf
Measurements 
Biology and fisheries 
Gear researchDescription: tests of presssure casing of the UKAERE scintollometer
Geology and geophysics 
DredgeQuantity: number of samples = 29
Description: 29 sediment samples (13 contained rock)
GrabQuantity: number of samples = 29
Description: 29 sediment samples (13 contained rock)
Core - rockQuantity: number of samples = 29
Description: 29 sediment samples (13 contained rock)
Core - soft bottomQuantity: number of samples = 29
Description: 29 sediment samples (13 contained rock)
Bottom photographyQuantity: number of stations = 6
Description: camera on the Casablanca traverse
Single-beam echosoundingDescription: echo-sounder watches kept
Seismic refractionDescription: each traverse had a continuous seismic profile taken before sampling
Magnetic measurementsQuantity: number of observations = 6
Description: magnetometer record between each traverse
Other geological/geophysical measurementsQuantity: number of surveys = 7
Description: traverses across shelf, 3 north of Canaries and 4 south - all crossed areas of different sedimentation conditions