Quaternary geological profile type map (1/200,000)
Description
The intention was not to touch the content of the existing maps, only where there were difficulties with joining at the edges. Initially, it was investigated where the drillings were located in those specific problem border strips. Before connecting the different map sheets, the interpretations of the respective drilling holes were carefully examined and, if necessary, reinterpreted to make connection possible. On the resulting card, 25 karting units are finally distinguished. Each mapping unit is genetically and chronostratigraphically defined. The mapping units are the building blocks of the different profile types. A profile type is thus defined on the basis of a specific sequence of the mapping units. However, in order to keep a profile type card legible, it is desirable to limit the number of units per profile type to eight (Mengling & Vinken, 1975). That maximum number of units has not been reached in any profile type. The original mapping units were defined differently depending on the contract holder who carried out the mapping (1/50,000) or even from map sheet to map sheet drawn up by the same contract holder. Some mapping units were lithostratigraphically named, others were lithologically defined. In addition, the various contractors generally used different lithostratigraphic names for the same mapping unit. With the objective that this overview map is primarily intended for a non-geologist, a simple definition of the mapping units has been chosen. The mapping units are therefore defined according to the genesis and age of the deposits. Based on genesis, four groups are distinguished, namely fluvial deposits (F), aeolian deposits (E), tidal deposits (G) and slope deposits (H). As far as quaternary chronostratigraphy is concerned, two classifications are followed in Flanders. The first group follows the international classification established by the International Union of Geological Sciences (IUGS, 2000). The Quartair started 1.81 million years ago. However, that provision is based only on the study of marine sediments originating from southern Italy (Aguirre & Pasini, 1985). The maps drawn up by the Catholic University of Leuven follow this classification. A second group follows the Northwest European classification. The Quaternary, more specifically the Pleistocene, was originally defined in northwestern Europe as the period in which cold influences clearly left their mark on the deposits (Lyell, 1839). The Quaternary began a cold phase about 2.6 million years ago. This phase is characterized, among other things, by the disappearance of subtropical plants, by changes in mammals and by the presence of shells and other organisms in the North Sea that today only occur in colder areas. All these changes almost coincide with the reversal of the Earth’s magnetic field, called the Gauss – Matuyama boundary. Based on these elements, the author of this Quaternary Geological Map, as well as geologists in Belgium, the Netherlands, Great Britain and other countries, uses the original definition of the Quaternary. The "plenary session of the ICS in Kyoto (1992)" showed that the strong current within the group of quaternary geologists to redefine the lower boundary of the Quaternary to the earlier boundary of about 2.6 million years is producing results. A joint group of specialists from the Quaternary and Neogen re-examines the problem. Since both classifications are used in Flanders, a chronostratigraphic overview table has been drawn up in the layout of this map on which both classifications have been proposed so that the user always has a guide at hand to place the information over time.
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https://metadata.vlaanderen.be/srv/dut/catalog.search#/metadata/b0d93d8d-9cc6-4fd6-a1b7-ef43e070b614 |
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https://metadata.vlaanderen.be/srv/dut/catalog.search#/metadata/b0d93d8d-9cc6-4fd6-a1b7-ef43e070b614 |
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https://metadata.vlaanderen.be/srv/dut/catalog.search#/metadata/b0d93d8d-9cc6-4fd6-a1b7-ef43e070b614 |
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https://metadata.vlaanderen.be/srv/dut/catalog.search#/metadata/b0d93d8d-9cc6-4fd6-a1b7-ef43e070b614 |
Tags
- gesteente
- vlaanderen
- afzetting
- quartair
- ondergrond
- dov
- departement-omgeving
- databank-ondergrond-vlaanderen