While wandering around, Matthew and I came across several old quarries. A bit of reading up later confirmed that these date from different time periods: Roman, Medieval, etc. The size of the stones excavated here seem to match the size of the blocks used in Neolithic temples. However, coralline limestone fractures naturally at joints of this size. Folks have probably been mining these same rock beds, using these same fracture planes, and reshaping the blocks to meet their architectural preferences for millennia.