1. Unweathered specimens are sometimes difficult to see on the rock surfaces.

2. The interface between weathered material and unweathered bedrock is known as the weathering front.

3. Chemical weathering was beginning to attack the unweathered bedrock.

4. The subscript O and W identify the unweathered and weathered states.

5. The zircon samples were fresh and unweathered. The rock is coarse-grained biotite monzogranite.

6. Horizon C is relatively unweathered parent material form which the mineral components of the above layers are derived.

7. However, a shift in the type of sediment from weathered to unweathered material is noted at this level.

8. This sequence of events would explain why any volcanic rocks that have erupted onto the surface in the past few billion years should still be unweathered and pristine.

9. Brightrays such as these are produced as impacts excavate and eject relatively unweathered subsurface material.