In Texas, United States
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Schist is an ancient Greek word meaning split. Geologically speaking, a schist is a rock formation of thin layers of various elongated minerals, such as mica or shale.
A schist is formed through the process of metamorphism, which is the effect of high heat or pressure on the original composition of the minerals. A typical example of metamorphism is the shifting of tectonic plates against one another.
Metamorphic formations are easily spotted due to the visible stranded or marbled layers of mineral compressed in the rocks.
Packsaddle Schist is a prime example of how metamorphism creates the signature layered formations. You can view a portion of the Packsaddle Schist in Llano County, TX
Along the west side of SH 71 lies a prominent 400-foot long outcropping of the schist. Ample parking is located about 800 feet south, at the pull-off for the historical marker on the northbound side. Walk north across the Honey Creek Bridge to the site.
To log this earthcache, please visit the site and submit your answers to the following questions:
1) In your estimation, how tall is the outcropping at its highest point?
2) What is the general direction, from top to bottom, of the layers of metamorphic rock?
3) What is the year displayed in the bottom-right corner of the historical marker?
OPTIONAL: Photographs of yourself or surroundings will be met with giddy earthcache-geek excitement.
Resources and credits:
Andrew Alden, about.com
Lafayette Geological Society
L. Gardiner, NESTA & windowstotheuniverse.com
John Crossley, americansouthwest.net
Placed by a member of Denton Area Wayward Geocache Seekers.
(No hints available.)
Last Updated: on 6/1/2014 11:12:46 AM Pacific Daylight Time (6:12 PM GMT)
Coordinates are in the WGS84 datum