Fri, 25 Jul 2014 23:00:21 +0000
Recumbent chevron folds in Early Pennsylvania graywacke and shale of the Bude Formation at Millook Havem on the north coast of Cornwall, southwestern Britain, record the development and deformation of the Varsican foreland basin -- testifying to the closure of the Rheic Ocean during the mid- to Late Pennsylvanian Variscan orogeny. From: GSA Today, Vol. 18, No. 12 (Dec.2009)
intrusive - pertaining to igneous rocks or features formed by the emplacement of magma in pre-existing rock.
Paleozoic Mesozoic Cenozoic
Strong folding in garnet gneiss, Hammerfest, Norway by Robert Harding
Glacial striations in granite of Canadian Shield - Ontario
Sinuosos pliegues de piedra en el glaciar Engabreen, Noruega (National Geographic Society)
Giant twisting forces shown in basalt column pattern near Aldeyjarfoss in northern Iceland.
Diabase dike cutting Red Cloud Granite in Minnesota
Geology on Georgian Bay
Geology | Structural Geology & Tectonics
PANAMINT RANGE, DEATH VALLEY, CALIFORNIA, USA Jagged - Also in the high-rising mountain chains at the edge of the dry and scorching hot Death Valley, weathering has created “flat irons” out of the jagged rock layers.
Marin Headlands with exposure of chert in a tight, plunging synclinal fold.
igneous dike, an intrusion of molten magmas into an existing crack