van Loon, A. T. Book Review: Sedimentary Structures (4th ed.), by John Collinson & Nigel Mountney, 2019. Dunedin Academic Press Ltd, Edinburgh, Scotland. Xii + 340 Pages. Paperback: Price €40.00, £35.00, $35.00, ISBN 978-1-78046-062-8. logos 2020, 26, 87-88.