The Culm Measures are a thick sequence of geological strata originating during the Carboniferous Period that occur in south-west England, principally in Devon and Cornwall, now known as the Culm Supergroup. Its estimated thickness varies between 3600 m and 4750 m though intense folding complicates it at outcrop. They are so called because of the occasional presence in the Barnstaple–Hartland area of a soft, often lenticular, sooty coal, which is known in Devon as culm. The word culm may be derived from the Old English word for coal col or from the Welsh word cwlwm meaning knot (due to the folding of the beds in which the coal is found).
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| - Culm Measures (en)
- Culm (géologie) (fr)
- Kulm (skały) (pl)
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| - Les Mesures de Culm sont une épaisse séquence de strates géologiques datant du Carbonifère, présentes dans le sud-ouest de l'Angleterre, principalement dans le Devon et les Cornouailles, et désormais connues sous le nom de Supergroupe de Culm. (fr)
- Kulm – morska facja dolnego karbonu (dinantu) składająca się z osadów detrytycznych (okruchowych skał niewęglanowych). W Polsce osady kulmu występują w zapadlisku górnośląskim, strefie śląsko-morawskiej i niecce śródsudeckiej. (pl)
- The Culm Measures are a thick sequence of geological strata originating during the Carboniferous Period that occur in south-west England, principally in Devon and Cornwall, now known as the Culm Supergroup. Its estimated thickness varies between 3600 m and 4750 m though intense folding complicates it at outcrop. They are so called because of the occasional presence in the Barnstaple–Hartland area of a soft, often lenticular, sooty coal, which is known in Devon as culm. The word culm may be derived from the Old English word for coal col or from the Welsh word cwlwm meaning knot (due to the folding of the beds in which the coal is found). (en)
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| - The Culm Measures are a thick sequence of geological strata originating during the Carboniferous Period that occur in south-west England, principally in Devon and Cornwall, now known as the Culm Supergroup. Its estimated thickness varies between 3600 m and 4750 m though intense folding complicates it at outcrop. They are so called because of the occasional presence in the Barnstaple–Hartland area of a soft, often lenticular, sooty coal, which is known in Devon as culm. The word culm may be derived from the Old English word for coal col or from the Welsh word cwlwm meaning knot (due to the folding of the beds in which the coal is found). Most of the succession consists of shales and thin sandstones, but there are also occurrences of slate, limestone and chert. Culm grassland on the formation's slates and shales is composed of purple moor grass and rush pasture. It is noted for a wide diversity of species, some extremely rare including the marsh fritillary butterfly. Some 92 percent of Culm grassland has been lost in the past 100 years, 48 percent being lost between 1984 and 1991 alone. There are a number of organisations trying to halt the decline including Devon Wildlife Trust with its Culm Natural Networks project, Butterfly Conservation, and Natural England with its Environmental Stewardship Scheme. Culm soils have traditionally been used for grazing as they are heavy to work and acidic. (en)
- Les Mesures de Culm sont une épaisse séquence de strates géologiques datant du Carbonifère, présentes dans le sud-ouest de l'Angleterre, principalement dans le Devon et les Cornouailles, et désormais connues sous le nom de Supergroupe de Culm. (fr)
- Kulm – morska facja dolnego karbonu (dinantu) składająca się z osadów detrytycznych (okruchowych skał niewęglanowych). W Polsce osady kulmu występują w zapadlisku górnośląskim, strefie śląsko-morawskiej i niecce śródsudeckiej. (pl)
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