Archive for the ‘Gneiss Rock’ Tag
Bruce Garrett with His Talking Stick, Standing On A Gneiss Rock — Image by kenne
Most of this decade SCVN member Bruce Garrett led a geology walk, called “Gneiss Walk” in the Sabino Canyon Recreational Area. It has been a very popular walk, not only because he was very knowledgeable but because he was very entertaining. He loved talking to people.
Bruce will be dearly missed by all who had an opportunity to walk with him in Sabino Canyon and learn about the geology of the Santa Catalina Mountains.
— kenne
Kenne, Bryna, and Bruce in Sabino Canyon
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“Life On A Gneiss Rock” — Image by kenne
When you spend time in Sabino Canyon, you will see a lot of gneiss rock. Twenty-five million years ago two ancient rock types, 1.4-billion-year-old Oracle granite and 50-million-year-old wilderness granite combined to form a type of striped and banded rock called gneiss — pronounced “nice.” Today these striped rocks are seen in canyon cliffs and some streambeds. On the more shaded cliffsides, it is common to find different types of mosses and ferns growing on the nice rocks, especially during rainy seasons.
— kenne
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Gneiss Rock — “Rock Stream” Painting by kenne
Gneiss is a metamorphic rock form characterized by banding caused by segregation of different types of rock, typically light and dark silicates. Rather than an indication of specific mineral composition, the term is an indication of texture.
CLICK ON ANY OF THE IMAGES BELOW TO SEE LARGER VIEW IN A SLIDESHOW FORMAT.
Images by kenne
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