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Lichen Thalli on the Surface of a Frost Wedged Rock

Lichen Thalli on the Surface of a Frost Wedged Rock

This rock is being colonized by lichen thalli. The rock has a crack in it, with a small crevice beneath the crack. The crack will continue to widen, due to the mechanical weathering process known as frost wedging.
Galleries: Lichens, Yosemite National Park
Keywords: frost wedging, hetch hetchy valley, lichen, mechanical weathering, thalli, thallus, yosemite national park
Photo Location: Yosemite National Park, California
Photographer: Dr. Roy Winkelman
Date of Photo: 07/09/2011
Device Make: Canon
Device Model: Canon EOS 5D Mark II
Original Dimensions: 5133×3543
Picture Orientation: Landscape
GPS Coordinates: 37°46'14.15"N 119°30'38.78"W
Picture Number: 12706