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COURSE - a row of stones.

ASHLAR - cut, rectangular stone used in walls.

RUBBLE - irregular, uncut stone used in walls.



Random Rubble

This pattern is made from stones of different shapes and sizes without much order. The pieces fit together fairly well.


Coursed Rubble

This pattern is made from uncut stones placed in rows called courses.



Like the mosaics of ancient Rome, this is a pattern of different stones that fit together very well.


Random Ashlar

This pattern is made of cut stones that fit together, but are not in rows.


Coursed Ashlar

This is a pattern of cut stones that fit together and are placed in rows.