Puff adders leave linear, sometimes slightly undulating traces. EcoPrint/Shutterstock October 5, 2023 Fossil snake traces: another world-first find on South Africa’s Cape south coast Charles Helm, Nelson Mandela University and Hayley Cawthra, Council for Geoscience The trace was probably made between 93,000 and 83,000 years ago, almost certainly by a puff adder.