The aims of this project are to solve a long-standing debate on the development and migration of linear dunes, to use GPR to image the internal structure of linear dunes and test models for the structure of linear dunes and determine their age. The objectives are to answer questions such as: 1. How are liner dunes formed? 2. Do linear dunes move sideways? 3. Are linear dunes Pleistocene relics? 4. Why are linear dunes so common in modern deserts but rarely recognised in the rock record?