Friday, September 08, 2006

G.A.R.T. 2006 Photos
Chapter 8a: Pictured Rocks National Lakeshore

The sandstone would normally not have any color to it at all, just a chalky white, but these cliffs are rich in mineral deposits, and the minerals seeping through the rocks give it stripes of amazing color. The reds and oranges are iron; the blues and greens are copper; the black is manganese and the bright white is calcium.


Mister Ed T said...

Fascinating pics. Thanks for the geology lesson.

Anonymous said...

Beautiful, fascinating.....I love all things geological. Mom C.