21-30

F21. Photomicrograph of the base of basement Unit 4.

F22. Photomicrograph showing typical internal texture of sandstone and siltstone in basement Unit 5.

F23. Summary of some grain-size characteristics for the volcanic conglomerate.

F24. Close-up photograph of interval 183-1137A-37R-1, 27-47 cm.

F25. Close-up photograph of interval 183-1137A-37R-5, 20-40 cm.

F26. Close-up photograph of interval 183-1137A-39R-1, 105-118 cm.

F27. Photograph of Core 183-1137A-39R-2.

F28. Photomicrograph from near the base of the crystal-vitric tuff.

F29. Photomicrograph from the breccia at the top of basement Unit 10.

F30. Photomicrograph from the breccia at the top of basement Unit 10.