Formation of periodic bedrock ridges on Earth

Periodic bedrock ridges (PBRs) are unexplained aeolian landforms discovered on Mars. PBR morphology and length scale resemble megaripples or small reversing dunes, but PBRs are eroded directly into bedrock. In this article we describe the first identified terrestrial PBRs from the Puna plateau of Argentina and present a hypothesis for their formation. The PBRs have formed in ignimbrite bedrock and are morphologically similar to nearby gravel...