Thursday, November 22, 2018

Slickensides- slick with sides- show Earth movement Direction >

Slickensides found at the Mendocino 40.439N transform, compared with loose rounded rocks from Whidbey Island beaches:
Slick and shiny in the desert Sun at Hiway 9 to Zion NP, these show lateral and Vertical (4x) striations:
Hiway 9 scarp with the above Slickensides on the East side, left; this is on the edge of the CounterClockwise CCW rotatimg (Rising) Colorado Plateau Cp:
Not always slick, below are some broken samples:
Sometimes, slickensides are difficult to distinguish from ice:

Above is Mendocino, CA- where I found the samples loosened by a backhoe.

Below outcrop requires the Hardness (Silicate  SiO2) to be tested with a knife:
Slickensides may occur on both sides af a graben-which is an anomaly at the end of a part of the Hurricane fault Hf:
Thrust fault has the gouge on the bottom, and hardened  Slickensides on the upper:
PVM, Pine Valley Mountain- a 22 million year monzonite (intrusion) Uplift- now rotates CW (sinking by erosion and under its weight) has Ben's feet on the Scarp:
Patina- a hardened cover over soft outcrops- is formed by micro-organisms, and may be mistaken for slicks: test the smoothness and disparate striations:

Small thrust has both an "S" and begining Patina- but is not a slickensides:
Difficult  to identify is a smoothed portion on a jagged PVM monzonite intrusion:
Slick anomaly, inside a canyon Anomaly alongside Hf, has a Lateral movement- which is the main criterion:
Striations are obvious at the CW rotating I-15 Freeway on the south side:

You should now be able to identify these Direction finders, whether Laterally or Veretically moved; below is an Artificially-scratched piece of Concrete:

1 comment:

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