tag:blogger.com,1999:blog-5211670216140060946.post603553724567412431..comments2024-03-17T18:37:36.377-07:00Comments on Geotripper: The Way it Was Today: Yosemite Valley in NovemberGarry Hayeshttp://www.blogger.com/profile/00531226195147986457noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5211670216140060946.post-71445104184399665882013-11-03T17:08:10.826-08:002013-11-03T17:08:10.826-08:00"The Eocene Heart Mountain detachment (HMD; W..."The Eocene Heart Mountain detachment (HMD; Wyoming, United States) is one of the most controversial and enigmatic geological features representing the largest and best-preserved volcanic landslide structure on Earth (Malone, 1995). Allochthonous, upright, mountain-sized blocks of Paleozoic carbonate and Eocene volcanic rocks are dispersed over an area of 3400 km^2, with a displacement of as much as 110 km on a surface that dips less than 2° (Beutner and Gerbi, 2005; Malone and Craddock, 2008; Craddock et al., 2009). Over the past 20 yr, most researchers accept that emplacement of allochthonous rocks was initiated by the catastrophic collapse of a stratovolcano ~50 m.y. ago, and that the entire event took place over a period of a few minutes to hours (Malone, 1995; Beutner and Gerbi, 2005; Aharanov and Anders, 2006; Anders et al., 2010; Craddock et al., 2009). Thus, the HMD emplacement event is considered to be a much larger analog of the famous A.D. 1980 catastrophic landslide-eruption of Mount St. Helens (Washington State)." <br /><br />Vertical injectites of detachment carbonate ultracataclasite at White Mountain, Heart Mountain detachment, Wyoming <br /><br />John P. Craddock, Jesse Geary, David H. Malone<br />GEOLOGY, May 2012Ben Nevishttps://www.blogger.com/profile/06509322223796626966noreply@blogger.comtag:blogger.com,1999:blog-5211670216140060946.post-16091967660068966452013-11-03T08:37:08.009-08:002013-11-03T08:37:08.009-08:00You, and your students, are so fortunate to have s...You, and your students, are so fortunate to have such beauty, and geology, in your back yard. Always happy to join along.Gaelynhttp://geogypsytraveler.comnoreply@blogger.com