DESCRIPTION: Stromatolites are layered mound-like structures formed by the trapping of sediment by sheets of cyanobacteria.

Figure 1 - Differential weathering exposes stromatolitic mounds that existed near the shoreline of the Lower Ordovician sea in Central Texas. Honeycut Bend, TX.

Figure 2 -  Stromatolites of the Siyeh Formation near Logan Pass, Glacier NP.

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