Elsterian glacial period dating

The base of the Mariner Formation is defined regionally on seismic reflection profiles by an irregular erosion surface, which is locally overlain by a diamicton (Johnson et al., 1993).

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For the following account, the modern coastline is taken as the boundary separating onshore and offshore Quaternary sedimentary deposits.

Compared with the fragmented onshore Quaternary sedimentary record, that offshore is considerably more complete, especially towards the shelf-edge where large submarine fans formed during major glacations (P915341).

In the northern North Sea, the Shackleton Formation (Johnson et al., 1993) includes an erosion surface that separates sand-rich sediments below from mud-rich sediments above.

The incoming of mud-rich sediments is reflected by a change of acoustic facies that is tentatively attributed by Johnson et al.

Contributors: J F Aitken, D F Ball, D Gould, J D Hansom, R Holmes, R M W Musson and M A Paul.

An understanding of Scotland’s evolving landscape requires knowledge of how the position of the coastline has varied throughout the Quaternary in response to changes in climate and relative sea level.

The thickest and most complete sequence (more than 500 m) is preserved in the Central Graben of the North Sea, which has subsided tectonically throughout the Quaternary.

At least ten till units are present within the Norwegian Channel with six or seven extending to the distal shelf break (Sejrup et al., 2000).

Details of map coverage are given in Information Sources.

Interpretations are based mainly on seismic reflection data calibrated by borehole logs.

Regionally mappable seismostratigraphical units have been established as formations and members where there is sufficient lithostratigraphical, biostratigraphical or chronostratigraphical control (P915280; P915281), but difficulties in correlation are common.

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