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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 .
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 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.
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The Paleocene to Eocene volcanics consist of volcanism flows and sills of tholeitic to alkalic basalts with associated tuff breccia, siltstone and sandstone. The flows are vesiculated with zeolite filled amygdules. The volcanics originated as oceanic crust and seamounts.
Here's a look at how the NCAA Tournament bracket projects as men's college basketball heads into late February. Who's in, out and on the bubble?
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