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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 ...
Aztec Siltstone is a geological formation in Victoria Land, Antarctica. It is part of the Taylor Group which preserves fossils dating back to the Middle-Late Devonian boundary. The formation is the uppermost formation in the group and overlays the Beacon Heights Orthoquartzite and underlies the Weller Sandstone .
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The formation is composed of siltstone and dark grey shale, with dolomitic siltstone in the base and fine grained sandstone towards the top. [2] The facies is shaley in the north and west of the extent (Fort St. John), silty in the center (Dawson Creek and Pouce Coupe areas) and becomes coarser in western Alberta (Valleyview area).
The oldest beds of this formation belong to the Dinosaur Canyon Member, a reddish, slope-forming rock layer with thin beds of siltstone that are interbedded with mudstone and fine sandstone. [11] The Dinosaur Canyon, with a local thickness of 140 to 375 feet (43 to 114 m), was probably laid down in slow-moving streams, ponds and large lakes. [7]
The Fitz Creek Siltstone is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period. See also. Earth sciences portal; Alaska portal;
Pages in category "Siltstone formations" The following 200 pages are in this category, out of approximately 331 total. This list may not reflect recent changes .
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