Glacier-Going To The Sun RedBus Tour 8-2009 - dogs-at-work
Glacier, MT-RedBus Tour Sights.  A petrified mushroom our RedBus guide told us.  It is a one billion-year-old stromatolites embedded in limestone along Going-To-The-Sun Road.  The concentric rings represent calcareous layers of limestone where ancient colonies of cyanobacteria once thrived in shallow seas.

Glacier, MT-RedBus Tour Sights. A petrified mushroom our RedBus guide told us. It is a one billion-year-old stromatolites embedded in limestone along Going-To-The-Sun Road. The concentric rings represent calcareous layers of limestone where ancient colonies of cyanobacteria once thrived in shallow seas.

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