Hydrothermal quartz veins in cavities and joints are common. Small cross-laminations and graded bedding indicate the rocks are upright. These rocks appear to be near the center of an anticlinal flexure. Click for larger view. Hwy 270 Roadcut, Crystal Mountain Sandstone.
Hydrothermal quartz veins fill fractures in sandstone talus.
Special Credit goes to Mike Perioux for implementing this site on the Datacom net.