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At its type area north of Ouray, Colorado, the Cutler Formation consists of over 1,000 feet (300 m) of bright red sandstone, siltstone, and conglomerate beds alternating with reddish mudstone or clay-rich limestone. [3] Further west, the unit shows great lithological diversity, and can be divided into easily recognizable mappable subunits.
The formation consists of mudstone and siltstone, partly laminated and bituminous, medium to dark grey in colour, with rare fine grained calcareous sandstone beds. Limestone and phosphatic nodules are present at some levels.
Siltstone is an unusual rock, in which most of the silt grains are made of quartz. [11] The origin of quartz silt has been a topic of much research and debate. [ 12 ] [ 13 ] Some quartz silt likely has its origin in fine-grained foliated metamorphic rock, [ 14 ] while much marine silt is likely biogenic, [ 15 ] [ 16 ] but most quartz sediments ...
Map of Mercia Mudstone Group's outcrop (Triassic) in Wales and southwest England The Mercia Mudstone Group is an early Triassic lithostratigraphic group (a sequence of rock strata ) which is widespread in Britain, especially in the English Midlands —the name is derived from the ancient kingdom of Mercia which corresponds to that area.
The Group comprises the Upper Stromness Flagstone Formation and the Lower Stromness Flagstone Formation laid down in the lacustrine Orcadian Basin during the Eifelian Stage of the Devonian Period.
Fossils have been recovered from every rock type in the Llewellyn but are predominantly found in the siltstone, shale, and coal layers. The compression fossils from the Llewellyn formation are well known for the striking white color on the dark stone. An important location for these fossils is near St. Clair, Pennsylvania.
Kid Rock, an ally of President Donald Trump and country star, called lyricist Kendrick Lamar's Super Bowl 59 halftime show "DEI" in a new interview.
The area contains the Pittman Formation consisting largely of quartz-rich sandstone, siltstone and shale; the Adaminaby Beds and the Acton Shale. [1] Most of the younger rocks are pyroclastic deposits from explosive volcanic eruptions, but the Yarralumla Formation is a sedimentary mudstone/siltstone formation that was formed around 425 million ...