The Mt. Touke stratum was laid down in the Pliocene and early Pleistocene epochs. It is some 1500 meters thick on average, and rich in fossils.
也由於左鎮鄉的地質為上新世至更新世早期的頭嵙山層，平均厚度為一千五百公尺，此層中含有豐富的海相、濱海相、淡水相等各類化石群，隨著地殼隆起而露出成陸。