Warstwa (geologia)
(c) I, Luca Galuzzi, CC BY-SA 2.5
Warstwa – w geologii jedna z podstawowych części ośrodka skalnego skał osadowych (osadów).
Cechą charakterystyczną warstwy jest stosunkowo niewielka, w przybliżeniu jednakowa miąższość i duża rozciągłość. Warstwa jest ograniczona od dołu i od góry mniej więcej równoległymi płaszczyznami (spągiem i stropem warstwy), które stanowią wyraźne granice. Granice te mogą być ostre lub stopniowe i wynikają ze zmiany cech skały, np. tekstury, struktury lub są powierzchniami nieciągłości.
W sedymentologii warstwa jest jednostką warstwowania i może się składać z kilku lub więcej mniejszych warstw (lub lamin) i stanowić część ławicy.
Bibliografia
- Wojciech Jaroszewski, Leszek Marks, Andrzej Radomski, Słownik geologii dynamicznej, Warszawa: Wydawnictwa Geologiczne, 1985, ISBN 83-220-0196-7, OCLC 830183626.
Media użyte na tej stronie
Kielce-slichowice2.jpg
Autor: User:Pibwl, Licencja: CC BY-SA 4.0
Rezerwat Ślichowice w Kielcach, w dawnym kamieniołomie - widoczny obalony fałd z okresu orogenezy hercyńskiej
Autor: User:Pibwl, Licencja: CC BY-SA 4.0
Rezerwat Ślichowice w Kielcach, w dawnym kamieniołomie - widoczny obalony fałd z okresu orogenezy hercyńskiej
USA 09855 Grand Canyon Luca Galuzzi 2007.jpg
(c) I, Luca Galuzzi, CC BY-SA 2.5
(original description)--Grand Canyon, Arizona. Nearly two billion years of the Earth's history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. Arizona, USA.
(view approx. due-north)--From Dana Butte region, on en:Tonto Trail-(on the Tonto Platform), southside of Granite Gorge, Colorado River. The en:Isis Temple prominence, 7,012 feet (2,137 m), is on an uplifted, faulted-block, with Sumner Butte (unseen) to right, and a 3rd "prominence", also part of the block, at the southwest of Bright Angel Canyon-(creek)-(Bright Angel Fault). The northeast flank of the block is down Phantom Creek-(canyon, to Bright Angel Canyon)-(the Grandview Fault). The geology units beyond, are consequently offset, (lower by 200-250? ft). The landmark point, to the right of ISIS peak, is the end of The Colonnade, 7,296 feet (2,224 m), on the next canyon southeast from Tiyo Point, 7,762 feet (2,366 m), of the southwest Kaibab Plateau, (seen in the background); (the viewpoint looks slightly uphill from Dana Point).
Tiyo Point is 3-mi from Isis Temple (peak), and The Colonnade, (though appears as a twin peak), is 1.5 mi from Isis.
Isis Temple is topped by the lowest (buff-white unit), en:Coconino Sandstone, then a short slope of Hermit Shale, and the Supai Group "redbeds". The cliffs below the 'redbeds' are Redwall Limestone; then upon the slopes of en:Muav Limestone & Bright Angel Shale (No Tapeats Sandstone). Instead the base of Isis Temple sits on a 'mountain island' of Shinumo Quartzite of the en:Ukar Group, part of the Grand Canyon basement rock geology. (Tapeats Sandstone is in all the landforms surrounding the uplifted block.)
(c) I, Luca Galuzzi, CC BY-SA 2.5
(original description)--Grand Canyon, Arizona. Nearly two billion years of the Earth's history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. Arizona, USA.
(view approx. due-north)--From Dana Butte region, on en:Tonto Trail-(on the Tonto Platform), southside of Granite Gorge, Colorado River. The en:Isis Temple prominence, 7,012 feet (2,137 m), is on an uplifted, faulted-block, with Sumner Butte (unseen) to right, and a 3rd "prominence", also part of the block, at the southwest of Bright Angel Canyon-(creek)-(Bright Angel Fault). The northeast flank of the block is down Phantom Creek-(canyon, to Bright Angel Canyon)-(the Grandview Fault). The geology units beyond, are consequently offset, (lower by 200-250? ft). The landmark point, to the right of ISIS peak, is the end of The Colonnade, 7,296 feet (2,224 m), on the next canyon southeast from Tiyo Point, 7,762 feet (2,366 m), of the southwest Kaibab Plateau, (seen in the background); (the viewpoint looks slightly uphill from Dana Point).
Tiyo Point is 3-mi from Isis Temple (peak), and The Colonnade, (though appears as a twin peak), is 1.5 mi from Isis.
Isis Temple is topped by the lowest (buff-white unit), en:Coconino Sandstone, then a short slope of Hermit Shale, and the Supai Group "redbeds". The cliffs below the 'redbeds' are Redwall Limestone; then upon the slopes of en:Muav Limestone & Bright Angel Shale (No Tapeats Sandstone). Instead the base of Isis Temple sits on a 'mountain island' of Shinumo Quartzite of the en:Ukar Group, part of the Grand Canyon basement rock geology. (Tapeats Sandstone is in all the landforms surrounding the uplifted block.)