Figure 10. (a) Layered beds of the Eliot Formation trending perpendicular to the shovel handle. This rock was originally deposited horizontally as muddy sediment millions of years ago and eventually became a rock by burial and pressure. The rock now is no longer horizontal but has been folded and is standing on end. If you trace the layers near the head of the shovel walking to the north (into the photo) you can see a gentle warping of the beds in the exposure. (b) Layering in the beds is less distinct in this photo, but the discontinuous white quartz layers above the hammer head clearly show how the rock has been sheared (arrows show shear sense). (c) Fine layering in the rock to left of mussel shell shows very tight folding in the rock. (d) Distorted and discontinuous white quartz stringers (in both (c) and (d), arrows show shear sense; shell is about 2 inches long). Click on images for a larger view.
Last updated on May 2, 2008