In addition to the pluton and dike, magma has branched out from the dike to form a nearly horizontal sheet of rock, called a sill. Examine the faces of the block to visualize how the sill (the green sheet) is oriented in the block. On the worksheet (I-1), describe how you could distinguish between a sill and a dike based on how they appear on the faces of the block. |
Rotate block |
Intrusions - Plutons, Dikes, and Sills |