This allowed the team to map sedimentary layers that ... rather than a series of warm and cold periods. Taken together, the ...

The map was compiled by the National Institute ... up of soft sediment that settled in valleys carved out after the glacial period. Such areas are more vulnerable to shaking when earthquakes ...

This allowed the team to map sedimentary ... of warm and cold periods. Taken together, the evidence allowed the researchers to pinpoint the time when the Marinoan glaciation began—approximately ...