41-50

F41. Photomicrographs of altered olivine.

F42. Photomicrograph of ilmenite exsolution in titanomagnetite in Unit 2B.

F43. Photomicrograph of pentlandite in vein segregation in Unit 2B.

F44. Photomicrograph of garnet and brown hornblende grains in the volcanic sandstone of Unit 5.

F45. Photomicrographs of plagioclase phenocrysts with continuous feldspar overgrowths in a massive trachyte from Unit 6.

F46. Photomicrograph of flow-banded texture around sanidine phenocryst in the flow-banded rhyolite in Unit 6.

F47. Photomicrograph of symplectite intergrowths between plagioclase and alkali feldspar in a granite clast from the base of Unit 6.

F48. Photomicrographs of garnet-biotite gneiss.

F49. Photomicrograph of actinolite and microcline in the actinolite-bearing gneiss in Unit 6.

F50. Photomicrograph of a deeply embayed quartz crystal in Unit 9 tuff.