m7a GLG

Shale 1. Color a. Dark gray 2. Texture (clastic or crystalline/chemical?) a. Clastic 3. Approximate Grain Size (for clastic rocks only: fine, medium, or coarse grained?) a. Fine 4. Sorting (for clastic rocks only: well-sorted, poorly-sorted, or somewhere in between?) a. Well-sorted 5. Depositional Environment (in what general environment was this rock originally formed?) a. Underwater where the current is gentle, such as the ocean floor. Calcareous Tufa 6. Color a. Beige 7. Texture (clastic or crystalline/chemical?) a. Clastic 8. Approximate Grain Size (for clastic rocks only: fine, medium, or coarse grained?) a. Coarse 9. Sorting (for clastic rocks only: well-sorted, poorly-sorted, or somewhere in between?) a. Poorly-Sorted 10. Depositional Environment (in what general environment was this rock originally formed?) a. In alkaline conditions, such as salt lakes. Sandstone 11. Color a. Orange around the outside, with a more uniform color where not exposed to the environment. 12. Texture (clastic or crystalline/chemical?) a. Clastic 13. Approximate Grain Size (for clastic rocks only: fine, medium, or coarse grained?) a. Fine 14. Sorting (for clastic rocks only: well-sorted, poorly-sorted, or somewhere in between?) a. Well-Sorted (but less well sorted than Shale) 15. Depositional Environment (in what general environment was this rock originally formed?) a. In moving water, where there is a current (less gentle than in the formation of shale but not violent).

Conglomerate 16. Color a. Beige with intrusions of various colors (red, gray, and other shades of beige) 17. Texture (clastic or crystalline/chemical?) a. Clastic 18. Approximate Grain Size (for clastic rocks only: fine, medium, or coarse grained?) a. Coarse 19. Sorting (for clastic rocks only: well-sorted, poorly-sorted, or somewhere in between?) a. Poorly-Sorted (less so than Calc-Tufa, if only slightly) 20. Depositional Environment (in what general environment was this rock originally formed?) a. In quickly moving water, such as a river. Limestone 21. Color a. Beige, with mottling of off white where rock that was not exposed to the surface has been chipped at. 22. Texture (clastic or crystalline/chemical?) a. Clastic 23. Approximate Grain Size (for clastic rocks only: fine, medium, or coarse grained?) a. Fine-Medium (slightly more coarse than Sandstone and a little rougher to the touch) 24. Sorting (for clastic rocks only: well-sorted, poorly-sorted, or somewhere in between?) a. Medium-Well 25. Depositional Environment (in what general environment was this rock originally formed?) a. In warm shallow water. Fossiliferous Limestone 26. Color a. Beige, with mottling of off white where rock that was not exposed to the surface has been chipped at. There are intrusions and patterns here where something has decayed. 27. Texture (clastic or crystalline/chemical?) a. Clastic 28. Approximate Grain Size (for clastic rocks only: fine, medium, or coarse grained?) a. Fine-Medium (slightly more coarse than Sandstone and a little rougher to the touch), aside from intrusions. 29. Sorting (for clastic rocks only: well-sorted, poorly-sorted, or somewhere in between?)

● For one of the rock samples of your choice, write a half-page summary describing the physical characteristics you can determine from your personal sample. Please include a photograph of your personal sample with your ID. I’ve included two pictures of one of my sandstone samples- but it didn’t come from the kit. This is my personal sample that I picked up off a trail a few years ago in Sedona, near Schnebly Hill, because I thought it was neat. The same sample is shown in both pictures- I just flipped it 180 degrees vertically to show its smooth side and where I believe it was chipped from a larger formation, as it’s less weathered on one side. There is a small stripe of white rock on the more weathered side, where an older chip was. It’s somewhat rough to the touch, and soft enough that I am able to scratch it with my fingernail. The pictures I took have different lighting (I think my camera corrected the second picture), but both sides are relatively uniform in color aside from very faint mottling and the single white stripe on the more weathered side. The stripe leads me to believe that this stone was once oriented on the side of a larger formation or boulder rather than on the top. I know that the bright red of this stone is due to iron oxide.