摘要: Samples for paleomagnetism analysis were taken from sediments andspeleothems in caves at various heights above river level in a karst tower,named Tunnel Hill,at Guilin(Figure1 ).The hill is not a single isolatedtower,but consists of five peaks rising from a common base.Althoughit contains numerous caves,the samples were collected from caves19,20,21 and28,all from the westernmost peak of the hill beside a channel of