>>260368
The pattern of the stones or the type of stone used?

Square rubble coursed masonry is the effect.

Square - because of the flat sides and top of the stone, Rubble - because of the different sized stones in width and height (unlike a standard brick wall) Coursed - because although they are different heights they go up in even layers and Masonry - because it's a stone wall.

Probably sandstone if you asking about the type of stone

>>260369

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