Stromatolite
Geologists call this a "laminated
sedimentary fossil". The black layers are fossilized algae, and the brown
layers are sediments that were trapped between the layers.
What does this rock tell us? That it was deposited in shallow water, because algae
needs sunlight in order to grow. For more information on the geology
of Tonto National Monument, click on the link.
NPS
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Updated
May 8, 2005