Part way up the Overlook trail, another stop for a geology lesson. Can you see the Stromatolites? They are the curviness in this rock on the left side, mostly in the mauve colors of this big rock. There are some little ones on the top of the rock (also in the mauve color)

Limestone and dolomite rocks are found in the Altyn, Helena, and Shepard formations within Glacier. More calcareous members of the Belt series, these larger formations depict deeper water depositional settings. Stromatolites, ancient fossils of blue-green algae that provide evidence of earth’s earliest physical and chemical compositions, are found in these calcareous settings and record the only trace of Proterozoic life known in the Belt Sea.