Benthic foraminifers in the Norwegian Channel: A comparison of Upper Quatemary and recent zonations

The Upper Quaternary sequence can be divided into four distinct zones, each characterized by a certain benthic foraminifer species. Five different benthic foraminiferal assemblages characterize the surface sediments of the Norwegian Channel. The core and surface sediment data have been treated with the computer program THREAD, which describes the core faunas in terms of the surface assemblages.
The consistency between the core fauna and the surface model is displayed in the communality values. Low values are believed to reflect depositional environments different from the present.
A communality minimum occurs in the lowermost part of the core, while the upper part is characterized by generally higher values and two prominent maxima. The increase around the 675 cm level corresponds to 10,000 years B.P. when the area changed from being a near glacial, fjordlike basin to a temperate, open marine depositional environment. During parts of the Holocene the environment
was similar to the present, the closest fit seen in the upper 50 cm of the core (last 800 years).