Sadly, some of them have now been stolen 😥

Anyone seen anything similar?

#sedimentology #quaternary #silcrete

They sit in classic dryland-lake chaos: salty floods, fine sands/silts/clays, extreme wet–dry cycles, deflation and duricrusts. After brain-picking (@davidjnash.bsky.social) wondering if dewatering + self-organisation, later wind excavation, and focused silcrete cementation formed them.