Orange Footwall "Sill" Nickel Plate Mine
Orange Footwall 'sill' is locally concordant locally discordant, with the structure of its sedimentary walls. The sediments were folded in two directions. Folds, following both these directions, are preserved in the concordant portion of the 'sill'. It seems, therefore, that the porphyry has re- placed the sediments, thus preserving within itself their structure.
anticline, Nickel Plate, porphyry, sill, syncline, geology, Mine, Mines, nickel, Porphyry, Rock, Rocks, sediments, Structure