Postrock comes from a unique feature in north central Kansas - lots of limestone rock. With the proper tools it is "easy" to quarry. Trees were few and far between in the early days here. Farmers used the limestone to make fence posts. yes they are large & heavy, but will last several generations. Lots of homes, farm buildings, commercial buildings and courthouses were constructed with limestone rock.
http://www.rushcounty.org/postrockmuseum/
