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 … More Puzzle rock (fractured sandstone)