Proterozoic Rocks, Glacier NP. Proterozoic sedimentary rocks in Glacier National Park, Montana The angular peaks, ridges and broad valleys were carved by Pleistocene and Recent glaciers . The Length of the Proterozoic. the Proterozoic Eon alone, at 1.955 billion years long,
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Red mudrock in Glacier National Park, Montana
Photomicrograph of spheroidal and filamentous microfossils from the Gunflint Chert of Ontario Canada
Tribrachidium heraldicum, a possible primitive echinoderm
Spriggina floundersi, a possible ancestor of trilobites
--were widespread between 545 and 670 million years ago