- Stromatolites are laminated calcareous structures caused mainly by nonskeletal algae (generally cyanobacteria; blue-green and green algae) that date back to the early Precambrian.
- biosedimentary in origin, and resulting from the interaction of filamentous and coccoid algae, which are in the form of "algal-mats" and physical sedimentary processes.
- perform a sediment stabilizing role by mechanically trapping and binding sediment particles on organic films.
- The result is a well laminated stromatolite and oncolites or a poorly laminated structure and clotted fabrics.
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