Puzzle rock (fractured sandstone)

A day in the field.

Arroyo Seco, California.

Sandstone fractures along parallel layers (horizontally) and also perpendicular to the visual grain line (vertically). These below sandstone fractures (now painted) were made all at once with a blunt object (hammer) striking the sandstone rock. 

Not all sandstone will have both vertical and horizontal fractures.

(Below) In nature we sometimes see vertical (shown below) and horizontal fractures combined. Depending on the granular consistence of the sandstone. Fractured breaks can be wavy, jagged, and at pseudo-90-degree angles.

Large sandstone boulders with fractures.

Looking from the top looking down, the fractured wall has a flat surface but is slightly curved.

A Zig-zag fractured large sandstone boulder caused by a blunt force (high river action)

(below) A large iron-stained sandstone boulder (orange colored rock) is protruding out of a grayish sandstone.

The orange (iron oxide) sandstone has flat and jagged fractures while in its host.

(below) A cliff face showing a large fracture sandstone separation laving behind a vertical and horizontal impression.

(below) Jagged or zig-zag fractures below caused by my hammer.

Below are blocky chunks produced with hammer.

Layers of sedimentary strata have broken off and created this talus slope of fragmented sandstone. (pictured below)

(above right) A close up of the fragmented sandstone (possibly composed of silt and clay mixtures).

Below are different sandstone pieces laying flat with the visible grain line. A blunt hammer caused the vertical fracture running perpendicular.

Below is sawing Sandstone.  Machining is much sharper and crisper compared to a Sandstone fracture.

Some of the sandstone was spray painted prior to cutting into blocks)

Below are sandstone blocks made by diamond saw (techno signatures).

(Below) Testing a natural piece of sandstone for fracture identification.

Using one piece of sandstone, I made a hammer blow to one side of the rock and numerous pieces broke apart.

I painted each separate piece of fractured sandstone and glued them back together so the fracture lines can be seen with ease.

Internal areas of weakness give way to a blunt forces and natural forces.

The End.


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