View allAll Photos Tagged SANDSTONE
Am gathering textures to use in GIMP that are set to my own choices. Instead of using CC by 4.0 belonging to others. If you make money, I expect ya to share.
This sandstone is from one that is called the Coconino Sandstone and is from northern Arizona. It is very clean (it does not have a lot of other minerals, it is mostly quartz), it is very-well sorted (the grains making up the sandstone are all about the same size). The sand that is now part of the Coconino Sandstone was laid down as desert dunes during the geologic time period called the Permian (250 to 300 million years ago) which is about 275 million years old.
A closer view of this sandstone image can be seen at: www.flickr.com/photos/usageology/52231704701/in/dateposted/ Just click on the image twice to see the enlarged view. In the enlarged view you can clearly see the quartz grains that make up the sandstone. It should be noted that sand, in a geological sense, is a size classification. More specifically it is between 1/16th mm to 2 mm in size. Because quartz is very durable, it is the most common mineral found in sands. But there are other sand grains, such as feldspars, garnets, magnetite, olivine and a lot of others as well, even tiny little "sea shells" (foraminifera sands).
Dune sands, like the Coconino Sandstone, are typically very well-sorted, due to the fact that the wind, that moves the grains, is very restricted to the size of the grains it can transport. Grains larger than sand are usually left behind and grains finer are blown far away as a "dust" storm. "Dust", in this sense is actually sediment grains called silt and clay particles. So sand is uniquely just the right size and weight to be moved by "normal" winds to produce the great sand dunes we so often see in the Southwestern United States.
But sand dunes are just one of the environments in which sand can accumulate. Beaches and rivers are other geologically important environments in which sands are deposited.
Here are some sand samples from these 3 important environments of deposition. And sands like these could easily become sandstones in the far future.
Fluvial Sands (Rivers): www.flickr.com/photos/usageology/albums/72157706192952435
Sand Dunes:
www.flickr.com/photos/usageology/albums/72157706310706284
Beaches:
www.flickr.com/photos/usageology/albums/72157676046292007
Refer to the Sedimentary Rock Charts (Clastic) in this album.
We cannot include every detail about sandstone, so here is a Wikipedia link to get you started on exploration en.wikipedia.org/wiki/Sandstone
Cannelton, Indiana
Constructed of local sandstone likely between 1840-50 when most other sandstone structures in town were built. It is listed on the NRHP.
This sandstone formation escapes me on how it was created. It is massive and solid yet looks like it was once gooey and flowing.
Sandstone Falls is an iconic feature of the New River in Southern West Virginia. This 25 foot waterfall spans a wide section of the River and is part of the New River National River park system.
Lichens on sandstone, photographed near the Bear Lodge Campground, NE of Alva, Wyoming on May 27, 2017.
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Sandstone Falls is an iconic feature of the New River in Southern West Virginia. This 25 foot waterfall spans a wide section of the River and is part of the New River National River park system.
Seven Hollows Trail has many fabulous sandstone glades, all covered in moss and lichens.
Petit Jean State Park, Conway County, Arkansas