Not logged in
Data Publisher for Earth & Environmental Science

Cunningham, Robert; Gilbert, Deborah (1985): Organic facies of Cenozoic and Cretaceous sediments at DSDP Leg 80 Holes. PANGAEA,, Supplement to: Cunningham, R; Gilbert, D (1985): Organic facies of Cenozoic and Cretaceous sediments from Deep Sea Drilling Project Sites 548 to 551, northern North Atlantic. In: De Graciansky, PC; Poag, CW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Gov. Printing Office), 80, 969-981,

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

The organic facies of Cenozoic sediments cored at DSDP Sites 548-551 along the Celtic Sea margin of the northern North Atlantic (Goban Spur) is dominated by terrestrially derived plant remains and charcoal. Similar organic facies also occur in the Lower and Upper Cretaceous sections at these sites. Mid-Cretaceous (uppermost Albian-Turonian) sediments at Sites 549-551, however, record two different periods of enrichment in organic material, wherein marine organic matter was mixed with terrestrial components. The earlier period is represented only in the uppermost Albianmiddle Cenomanian section at the most seaward site, 550. Here, dark laminated marly chalks rich in organic matter occur rhythmically interbedded with light-colored, bioturbated marly chalks poor in organic matter, suggesting that bottom waters alternated between oxidizing and reducing conditions. A later period of enrichment in organic material is recorded in the upper Cenomanian-Turonian sections at Sites 549 and 551 as a single, laminated black mudstone interval containing biogenic siliceous debris. It was deposited along the margin during a time of oxygen deficiency associated with upwelling-induced intensification and expansion of the mid-water oxygen-minimum layer. In both the earlier and later events, variations in productivity appear to have been the immediate cause of oxygen depletion in the bottom waters.
Median Latitude: 48.868083 * Median Longitude: -13.165297 * South-bound Latitude: 48.515200 * West-bound Longitude: -13.501500 * North-bound Latitude: 49.088000 * East-bound Longitude: -12.164000
Date/Time Start: 1981-06-10T00:00:00 * Date/Time End: 1981-07-16T00:00:00
2 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )