Its no differenty than Smiff tuff except it is sedimentary not volcanic. Same rock at Maple Cayon UT and Hope Boulders BC and Pinnacles Calif. The difference is the solidity of the matrix material that holds the stones together. On conglom with a quartzite matrix you can reef on 10% attached cobbles and they will hold where if the conglom is matrixed with weak sandstone or calcite they will pop with impunity.