Kenneth M. Cruikshank
Joints Part II. Surface Features

Kenneth M. Cruikshank
Joints Part II. Surface Features

Images of surface features of joints.

joint surface markings hackle twist-hackle

Schematic block diagrams illustrating surface markings on joint faces

(Figure 3.14, Twiss and Moore 1992)

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1990-01-03.jpg

Joint initiation point can be seen in center of photograph

(Slide ID: 1991-01-03)

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1990-03-10.jpg

Initiation point can be seen in lower-center of photograph

(Slide ID: 1990-03-10)

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1990-03-33.jpg

Joint initiation point is in the upper center of the photograph

(Slide ID: 1990-03-33)

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1991-11-08.jpg

Twist-hackle on a large joint surface

(Slide ID: 1991-11-08)

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1991-06-14.jpg

Large joint surface

(Slide ID: 1991-06-14)

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1991-10-18.jpg

Fracture surface, with propagation towards the viewer.

(Slide ID: 1991-10-18)

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1989-02-07.jpg

Valley of Fire State Park, Nevada

(Slide ID: 1989-02-07)

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1989-02-08.jpg

(Slide ID: 1989-02-08)

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1989-02-10.jpg

(Slide ID: 1989-02-10)

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1992-06-10.jpg

(Slide ID: 1992-06-10)

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1989-02-12.jpg

(Slide ID: 1989-02-12)

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1989-02-11.jpg

(Slide ID: 1989-02-11)

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1983-08-15.jpg

Joint surface - Arvid Johnson for scale. (Slide ID: 1983-08-15)

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1983-08-16.jpg

Joint surface - Kees DeJong and Arvid Johnson for scale. (Slide ID: 1983-08-16)

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http://geomechanics.geology.pdx.edu