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The Cromer complex ( synonym : Cromerium) is similar to the Saale complex, a period of the Pleistocene that encompasses several warm and cold periods , the structure of which is still uncertain. It is the older part of the Middle Pleistocene (Ionian) and ranges from the Bruhnes-Matuyama reversal of the earth's magnetic field at the border with the Calabrian, younger part of the Lower Pleistocene , around 0.786 million years ago to the beginning of the Holstein Warm Period 0.300 million years ago. The Günz glacial period , the first glaciation of the Alps, is set in the period of the Cromer complex .
From Clement Reid was a near the village of Cromer in the county of Norfolk of East Anglia on the coastal cliff under a moraine upcoming low powerful präglaziale layer sequence of lacustrine and marine sediments , the term "Cromer Forest-bed" than in 1882 stratigraphic used unit. This term quickly found widespread use in the Netherlands and Northern Germany as a term for interglacial sediments that were deposited immediately before the oldest Nordic inland glaciation of the Quaternary , the Elster Glaciation . According to the further investigations of the Cromer Forest-bed, which only began in the 1960s, only sediments of a warm period Middle Pleistocene age are present at the localities in eastern England, but these could be of different ages.
In the Netherlands, the Cromer complex is now divided into four independent interglacials , Interglacials I (Waardenburg) to IV (Noordbergum). The oldest Interglacial I, however, probably still belongs to the Old Pleistocene and it is uncertain which of the interglacial series of eastern England is of the same age. In addition, only parts of the interglacials are usually present, so that the correlation with the occurrences in the adjacent north-west German area is uncertain.
Includes in North-West Germany, based on the above the salt dome of Gorleben according to current state of drilled vertical sequence, the Cromer complex five warm periods and four cold periods. The oldest warm-time layers encountered are said to be of the same age as the Osterholz warm-time drilled near Elze . Overlying layers with a warm period vegetation sequence could be parallelized with the Hunteburg warm period drilled near Hunteburg . Two more layer sequences follow higher up with a warm period vegetation pattern, which have not yet been given names. The upper end is formed by sediments, which are paralleled with the Rhume warm period encountered near Bilshausen .
The Ice Age large mammal fauna discovered in the Mosbach Sands in 1845 near the former village of Mosbach, today part of the urban area of Wiesbaden , also has a Cromerian age, it is one of the most important fossil deposits in Germany. The Mosbach sands are part of a complicated sequence of deposits from the Rhine and Main . The main find layer was deposited in “Cromer-Interglacial III” after the investigations of the small mammal fauna.
In Central Germany , only two occurrences from the Cromer complex are known to date. The Voigtstedt warm period in the Voigtstedt brickworks mine near Artern, palynologically only incompletely preserved, is uncertain in its age, mostly it is placed in the older period of the Cromer complex. The 10 m thick loess , which was examined in more detail in the Mahlis brickworks near Wermsdorf in the 1970s, comprises larger parts of the Cromer complex. According to the palynological findings, the basal clay mud was deposited under a cold-age climate and it contains the carpological remains of a rich flora . The Bruhnes-Matuyama reversal has been demonstrated in the basal layers and the loess series, which is divided by fossil soils, is covered by ground moraine. While the loess layers were deposited in cold ages, the characteristics of the three embedded paleo soils speak for a warm period climate. The threefold structure that results from this cannot currently be reconciled with the Dutch and northwest German structures of the Cromer complex.
- German Stratigraphic Commission, Ed .; Editing, coordination and design: M. Menning, A. Hendrich: Stratigraphische Tisch von Deutschland 2016 . Potsdam 2016 (bib.telegrafenberg.de)
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