The geology of Arches
National Park lies on top of a salt bed that is thousands of feet thick. This
makes sense because Utah has massive salt planes to this day. According to the National Park Services
geology field notes the sandstone has been dated back to the Triassic and
Jurassic periods ranging from 210- 145 million years ago. The Arches are made up of sedimentary
rocks. Sedimentary rocks are more or less cemented together after years of
layering and compacting. In most
cases you can see the banding or strata. The layers that the sediment was
deposited in are normally seen as straight lines. However in some cases there are monoclines and anticlines
that form due to faults and folding that happened in the area millions of years
ago.
Source's
Geology
Fieldnotes: Arches National Park.
(2005, 01 04). Retrieved from http://www.nature.nps.gov/geology/parks/arch/
The pictures below where found at the nature park services in the pdf
below
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