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This term is typically applied to "fossil forests" of upright fossil tree trunks and stumps that have been found worldwide, i.e. in the Eastern United States, Eastern Canada, England, France, Germany, and Australia, typically associated with coal-bearing strata. [3] Within Carboniferous coal-bearing strata, it is also very common to find what ...
The Carboniferous (/ ˌ k ɑːr b ə ˈ n ɪ f ər ə s / KAR-bə-NIF-ər-əs) [6] is a geologic period and system of the Paleozoic era that spans 60 million years from the end of the Devonian Period 358.86 Ma (million years ago) to the beginning of the Permian Period, 298.9 Ma.
The strata become gradually younger from west to east. [1] [2] Much of Yorkshire presents heavily glaciated scenery as few places escaped the direct or indirect impact of the great ice sheets as they first advanced and then retreated during the last ice age. A simplified geology of Yorkshire
The geology of the Yorkshire Dales National Park in northern England largely consists of a sequence of sedimentary rocks of Ordovician to Permian age. The core area of the Yorkshire Dales is formed from a layer-cake of limestones, sandstones and mudstones laid down during the Carboniferous period.
The Carboniferous strata of the southwest of the National Park was more intensely affected by folding during the Variscan orogeny than strata elsewhere. A boundary between the two structural styles roughly follows the line of Asbian reef knolls from southeast to northwest, defining a 'mobile area' in the west characterised by broadly north ...
The Carboniferous system (equating to 359-299 Ma) is represented by four broadly parallel outcrops of the Carboniferous Limestone in the south and southeast of the county, between the more northerly two of which are outcrops of the Marros Group strata and the lower and middle Coal Measures, extending west to the shores of St Brides Bay.
In the official geologic time scale of the International Commission on Stratigraphy (ICS [1]), the Westphalian is placed within the Pennsylvanian Subsystem/Subperiod (323-299 Ma) of the Carboniferous System/Period. As a regionally defined stage, the Westphalian overlaps with official ICS stages which are in use on an international level.
The essence of the method is mapping of strata based on identification of surfaces which are assumed to represent time lines (e.g. subaerial unconformities, maximum flooding surfaces), thereby placing stratigraphy in chronostratigraphic framework allowing understanding of the evolution of the Earth's surface in a particular region through time.