The Grinnell Formation in Glacier National Park contains mudcracks that date back nearly 1.5 billion years.How can delicate sedimentary structures such as these be preserved?

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The Answer of The Grinnell Formation in Glacier National Park contains mudcracks that date back nearly 1.5 billion years.How can delicate sedimentary structures such as these be preserved?

The Grinnell Formation in Glacier National Park Contains Mudcracks That