In virtually all archeological reports, prehistoric pottery includes gravel, usually at a level of 25-30 %. Some also includes shells or hornblende.
在考古報告中，史前陶幾乎毫無例外地都有夾砂，夾砂率普遍在百分之二十五到三十之間，有的還夾貝殼砂、角閃石。