Search results
Results from the WOW.Com Content Network
A QFL chart is a representation of the framework grains and matrix that is present in a sandstone. This chart is similar to those used in igneous petrology. When plotted correctly, this model of analysis creates for a meaningful quantitative classification of sandstones. [24] A sandstone provenance chart is typically based on a QFL chart but ...
Bäch Sandstone: by the Lake Zürich; Bern Sandstone: quarry sites near Bern in Ostermundigen, Krauchthal and by the Gurten; Bollingen Sandstone (also Buchberg Sandstone, Uznaberg Sandstone, Bollinger-Lehholz Sandstone and Güntliweid Sandstone): Rapperswil-Jona by the Upper Lake Zürich; Grès à cailloux roulés: near Avenches; Grès de ...
Honeycomb weathering, also known as honeycombs, honeycombed sandstone, is a form of cavernous weathering that consists of regular, tightly adjoining, and commonly patterned cavities that are developed in weathered bedrock; are less than 2 cm (0.79 in) in size; and resemble a honeycombed structure.
A basalt, showing the 'pillow' lava shape characteristic of underwater eruptions, Italy. The naming of a lithology is based on the rock type. The three major rock types are igneous, sedimentary, and metamorphic. Igneous rocks are formed directly from magma, which is a mixture of molten rock, dissolved gases, and solid crystals.
The type of continuous cleavage that forms depends on the minerals present. Undeformed platy minerals such as micas and amphiboles align in a preferred orientation, and minerals such as quartz or calcite deform into a grain shape preferred orientation. Continuous cleavage is scale dependent, so a rock with a continuous cleavage on a microscopic ...
This type of grain is a main component of a lithic sandstone. Lithic sandstones , or lithic arenites , or litharenites , are sandstones with a significant (>5%) component of lithic fragments , though quartz and feldspar are usually present as well, along with some clayey matrix .
Loope, D.B., and C.M. Rowe (2003) Long-Lived Pluvial Episodes during Deposition of the Navajo Sandstone PDF version, 1.3 MB. The Journal of Geology 111:223-232. last accessed August 18, 2013; Loope, D.B., and C.M. Rowe (2005) Seasonal Patterns of wind and rain recorded by the Navajo Sandstone PDF version, 7.4 MB. Canyon Legacy. 54:8-12. last ...
Greywacke or graywacke (German grauwacke, signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness (6–7 on Mohs scale), dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or sand-size lithic fragments set in a compact, clay-fine matrix.