Rock 365 : Day 310 : Precambrian-Cambrian Unconformity
Day 310 : Running a field course in Ercall Quarries, Shropshire,
England for the third time in two weeks. This is the unconformity
(nonconformity) between the Late Precambrian (~560Ma) Ercall
Granophyre showing weathering at its upper surface and the breccia
facies of the (~535Ma) Lower Cambrian Wrekin Quartzite.