Ur-North Sea
The original North Sea is the informal term for flooding phases between the time of the Zechstein Sea and the last dry phase ( Doggerland ).
After the floods by the Zechstein Sea in Permian ( Lopingium , outdated Zechstein ) in northern Central Europe in the Triassic , Jura , Cretaceous and Paleogene periods of flooding alternated with periods of dryness.
Today's North Sea was only formed about 8,000 years ago when, after the last glacial period ( Weichsel or Würm glacial period ), the Doggerland between Denmark and the British Isles was flooded and Great Britain and Ireland were initially separated by the English Channel as an island .
The use of the term "primordial North Sea" is documented for the period about 90 to 10 million years ago (i.e. Upper Cretaceous to Middle Miocene ):
- Flechtingen-Roßlauer Scholle : The original North Sea advances there in the Tertiary (from 66 million years), in the Upper Eocene (from 38 million years) the area dried up again.
- Mühlhausen : The area in the Cretaceous (approx. 90 million years ago) was flooded by the original North Sea. After the sea retreated in the Rhenish Slate Mountains , the Middle Rhine flowed into the original North Sea around 25 million years ago
- Rhenish lignite mining area : Due to subsidence movements in the Tertiary, the original North Sea advances into this area in several phases.
- Lyby in Jutland : The Lyby fossils come from the original North Sea there 25 to 30 million years ago ( Oligocene ).
- Groß Pampau : The whale and seal fossils from there are approx. 10 to 11 million years old (Upper Middle Miocene )
- North German lowlands near Fürstenau : In the Eocene (approx. 55–34 million years ago) the original North Sea reached here.
Individual evidence
- ↑ PdfSR.com: The emergence of the Rhine ( Memento of the original from August 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Web site lyby-fossil.de
- ↑ Clay pit reveals huge whale skeleton . Retrieved August 4, 2016 .
- ^ Rich gravel pit: ancient seal dug up near Hamburg . Retrieved July 28, 2016 .
- ↑ The oldest seals in the world , in: Biol. Unserer Zeit 6/2011 (41) p. 366, Wiley VCI Verlag, Weinheim
