 The use of threshing stones quickly faded as they were superseded by mechanized forms of threshing, especially by threshing machines, and eventually all farmers quit using them by around 1900 to 1905.The threshing stone is a cylindrical stone with teeth carved into it.Stones made in Kansas were approximately 29 to 30 inches long, 23 to 24 inches in diameter, with 7 notches (and rarely 8) resembling gear teeth, made of limestone, and 600 to 800 pounds in weight.