Digging tools were used to dig the earth when farming or constructing pit houses. Two types of digging tools were used in the Neolithic period. The first type resembled a weeder, with a flat blade shaped like the sole of shoe, which was attached parallel to the shaft; this type was used like a shovel or spade. The second type, which resembled a hoe in both shape and function, had a heavy and relatively blunt blade that was attached perpendicular to the shaft. These artifacts are regarded as indirect evidence of farming in the Neolithic period.