3.7.3 High (Høyde)
3.7.3.1 A high is (a) a present-day or former positive geomorphological and/or structural feature of non-specified origin and shape, and (b) a positive geophysical anomaly.
3.7.3.2 High is a general term for (a) a geological or geomorphological feature that stands up relative to surrounding areas or structures, and (b) a positive geophysical anomaly.
3.7.3.3 No limitations are placed on the dimensions of a high.
3.7.3.4 The structure is mappable with the help of geomorphological, geological and/or geophysical methods.
3.7.3.5 A high will frequently be capable of being divided into (a) smaller geomorphological and structural features and (b) smaller geophysical anomalies.
3.7.3.6 A high can be given a formal or an informal name in accordance with the "general rules for defining and naming geological units" (Chap. 2) and the rules for naming geological form units (Section 3.7.1). In the compound name, the proper name (Section 2.2.2) is placed between the words "the ... High" (formal). The basis for defining a high can be indicated by adding such terms as "gravimetric" or "magnetic", or, if it is known to be a structural or geomorphological high this can be shown by adding, for example, "structural".
3.7.3.7.a A high may be part of a larger geomorphological, structural and/or geophysical feature. A high has a status among positive features corresponding to that held by the depression or low among negative features. A structural high need not be, and need never have been, a landform.
3.7.3.7.b A massif (massiv) is a geomorphological and/or structural high of regional size, and consists of ancient, usually crystalline rocks. Beyond the massif these rocks form the basement for younger sequences, e.g. the Bohemian Massif and the London Massif. "Massif" is also used in the sense of mountain massif to characterize extensive, prominent areas of upland.
3.7.3.8 Examples: From the continental shelf off Norway, the Frøya High (Frøyhøyden) (Hinz 1972) and Mid North Sea High (Midtnordsjøhøyden) (Rhys 1974) are examples of structural highs.
3.7.3.9 Key reference: Bates & Jackson (1980).