Base of the Horse Basin Rhyolite lava flow (baked paleosol)
View on map:42.715648°N 116.067330°W Comments
The rhyolite lave flow flow here baked the paleosol below as it flowed over it. A white ash layer, likely from the same eruption that produced the rhyolite is between the flow and the paleosol. Above the ash is a basal breccia of "vitrophyer blocks". If you look closely at the ash you can see where the blocks fell from the flowing rhyolite and deformed the paleosol and ash layers. See Figure 17 in Bonnichsen et al. Stop 13.
Description
Paleosol
In the geosciences, paleosol (palaeosol in Great Britain and Australia) can have two meanings. The first meaning, common in geology and paleontology, refers to a former soil preserved by burial underneath either sediments (alluvium or loess) or volcanic deposits (volcanic ash), which in the case of older deposits have lithified into rock. In Quaternary geology, sedimentology, paleoclimatology, and geology in general, it is the typical and accepted practice to use the term "paleosol" to designate such "fossil" soils found buried within either sedimentary or volcanic deposits exposed in all continents as illustrated by Rettallack (2001), Kraus (1999),[2] and other published papers and books.
References
- http://en.wikipedia.org/wiki/Paleosol
- Page 111- Bonnichsen, B., et al. 2016, From land to Lake: Basalt and rhyolite volcanism in the western Snake River Plain, Idaho: Geol. Soc. Amer., Field Guide 41
Average user rating: Not rated
Click on a star to rate
Please share your ideas with us.
Wikiplacemarks.com
Android Apps
Placemarks
Login
Faq
Language