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Cosa (chi) è unconformity$506209$ - definizione
THE HUGE GAP IN GEOLOGY
Powell’s Unconformity
![foliated]] and veined [[schist]]s of the [[Vishnu Basement Rocks]] truncated at the base of the Tonto Group](https://commons.wikimedia.org/wiki/Special:FilePath/Great Unconformity Tapeats Sandstone over Vishnu Schist from Hopi Point.jpg?width=200 "foliated]] and veined [[schist]]s of the [[Vishnu Basement Rocks]] truncated at the base of the Tonto Group")
Great Unconformity
Of the many unconformities (gaps) observed in geological strata, the term Great Unconformity is frequently applied to either the unconformity observed by James Hutton in 1787 at Siccar Point in Scotland,Rance, H (1999) Historical Geology: The Present is the Key to the Past. QCC Press, New York or that observed by John Wesley Powell in the Grand Canyon in 1869.
Unconformity
![John Clerk]] in 1787 and photographed in 2003.](https://commons.wikimedia.org/wiki/Special:FilePath/Hutton Unconformity , Jedburgh.jpg?width=200 "John Clerk]] in 1787 and photographed in 2003.")
![''Disconformity'' at [[Horni Pocernice]], Czech Republic](https://commons.wikimedia.org/wiki/Special:FilePath/Disconformity Horni Pocernice.jpg?width=200 "''Disconformity'' at [[Horni Pocernice]], Czech Republic")
![Mississippian]] [[Borden Formation]] and overlying Pennsylvanian Sharon Conglomerate, near [[Jackson, Ohio]]](https://commons.wikimedia.org/wiki/Special:FilePath/Borden-Sharon unconformity.jpg?width=200 "Mississippian]] [[Borden Formation]] and overlying Pennsylvanian Sharon Conglomerate, near [[Jackson, Ohio]]")
![dolomite]] ''nonconformably'' overlies 1.5-billion-year-old [[rhyolite]], near [[Taum Sauk Hydroelectric Power Station]], Missouri.](https://commons.wikimedia.org/wiki/Special:FilePath/Taum Sauk precambrian-cambrian unconformity.jpg?width=200 "dolomite]] ''nonconformably'' overlies 1.5-billion-year-old [[rhyolite]], near [[Taum Sauk Hydroelectric Power Station]], Missouri.")
![''Nonconfirmity'' at Ratssteinbruch near [[Dresden]], Germany](https://commons.wikimedia.org/wiki/Special:FilePath/Ratssteinbruch Dresden-Doelzschen.jpg?width=200 "''Nonconfirmity'' at Ratssteinbruch near [[Dresden]], Germany")
![Praia do Telheiro]], Portugal](https://commons.wikimedia.org/wiki/Special:FilePath/Angular Unconformity at Praia do Telheiro in Algarve in Portugal.png?width=200 "Praia do Telheiro]], Portugal")
![''Angular unconformity'' between the underlying [[Dockum Group]] and the overlying [[Exeter Sandstone]] at Steamboat Butte in the valley of the Dry Cimmarron, New Mexico](https://commons.wikimedia.org/wiki/Special:FilePath/Steamboat Butte New Mexico.jpg?width=200 "''Angular unconformity'' between the underlying [[Dockum Group]] and the overlying [[Exeter Sandstone]] at Steamboat Butte in the valley of the Dry Cimmarron, New Mexico")
![Angular unconformity in [[Jingtai County]], China](https://commons.wikimedia.org/wiki/Special:FilePath/Winkeldiskordanz.JPG?width=200 "Angular unconformity in [[Jingtai County]], China")
![Angular unconformity in [[pyroclastic rock]] layers erupted by [[Chimborazo]] volcano, Ecuador](https://commons.wikimedia.org/wiki/Special:FilePath/Tephra Layers at Chimborazo Volcano in Ecuador.jpg?width=200 "Angular unconformity in [[pyroclastic rock]] layers erupted by [[Chimborazo]] volcano, Ecuador")
DISTORTED SEDIMENT DEPOSITION
Unconformity (geology); Angular unconformity; Noncomformity; Disconformity; Tilt sequence; Unconformable; Paraconformity; Discomformity; Unconformably; Unconformities; Uncomformities; Hiatus (stratigraphy); Hiatus (geology); Unconformable surface; Disconformity (geology)
·noun Want of parallelism between strata in contact.
II. Unconformity ·noun Want of conformity; incongruity; inconsistency.
Unconformable
DISTORTED SEDIMENT DEPOSITION
Unconformity (geology); Angular unconformity; Noncomformity; Disconformity; Tilt sequence; Unconformable; Paraconformity; Discomformity; Unconformably; Unconformities; Uncomformities; Hiatus (stratigraphy); Hiatus (geology); Unconformable surface; Disconformity (geology)
·adj Not conformable; not agreeable; not conforming.
II. Unconformable ·adj Not conformable; not lying in a parallel position; as, unconformable strata.
Wikipedia
Great Unconformity
Of the many unconformities (gaps) observed in geological strata, the term Great Unconformity is frequently applied to either the unconformity observed by James Hutton in 1787 at Siccar Point in Scotland, or that observed by John Wesley Powell in the Grand Canyon in 1869. Both instances are exceptional examples of where the contacts between sedimentary strata and either sedimentary or crystalline strata of greatly different ages, origins, and structure represent periods of geologic time sufficiently long to raise great mountains and then erode them away.
