Figure 2. Much of the rock exposed at Marshall Point is interlayered quartzite (the light bands) and gray mica schist (the dark bands), here wildly contorted. The complicated layering and folding is the result of several events. Probably some of the layers of sand and mud, originally deposited in an ocean basin, slid down the slope and became contorted before they hardened into rock. Some of the folding resulted from the heat and pressure of later mountain building events and the intrusion of nearby igneous rocks between 440 and 360 million years ago. Click on photo for close-up of lower center (Figure 2a).
Last updated on June 7, 2006