Friday, August 1, 2014
Friday, July 25, 2014
|Photo by Tim Sherry|
Friday, July 18, 2014
Obsidian is a volcanic glass, lava that has cooled so quickly that crystals don't form. In Panama Crater, Mono Lake, California this lava was partially cooled. Stresses pulled the partially solidified obsidian apart, like taffy, forming what Structural Geologists call "boudinage". The less cohesive rock surrounding the boudining obsidian filled the gap. Other obsidian layers above and below the boudined layer have "bent" and deformed towards the boudin.
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