THE curiously-shaped concretions met with in the Champlain clays of the Connecticut Valley have for many years attracted attention. Indeed, so long ago as 1670 some specimens were sent to the ...

Eventually, coastal erosion liberated these concretions from the enclosing sedimentary rock, leaving them scattered along Koekohe Beach. For the local Ngāi Tahu people, the Moeraki Boulders hold ...