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Summary for Field Activity Number 1981-039-FA

Alternate Leg ID: IPOD 80

Area of Operations: Goban Spur, Pendragon Escarpment, Porcupine Abyssal Plain, Irish Continental Shelf, Northeast Atlantic

Dates: May 30, 1981 to July 22, 1981

Objectives: DSDP Leg 80 investigated the structural evolution and depositional history of the Goban Spur and adjacent Porcupine Abyssal Plain. Structural relationships and fossil assemblages indicate the rifting of the Armorican margin created submarine relief of as much as 2,000 m. Sea-floor spreading began no later than early Aptian, accompanied by rapid crustal subsidence, and regional downwarping and tilting. Subsidence was greatest near ocean/continent juncture, diminishing near the thicker continental crust. Subsidence has been minimal since Eocene, influenced by oceanic circulation and water chemistry.

Type of Activity: Sampling

Information to be derived: Samples and chemical analysis
Grain size analysis

Summary: Wells: 4 (#548, 548A, 549, 549A, 550, 550A, 550B, 551); Cores: 306, recovered 296 (2397.5 m cored, 1493 m recovered).

USGS Project Number: DSDP

Contact: Wylie Poag (

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
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