Lichen stromatolite

Lichen stromatolites are laminar calcretes that are proposed as being formed by a sequence of repetitions of induration followed by lichen colonization. Endolithic lichens inhabit areas between grains of rock, chemically and physically weathering that rock, leaving a rind, which is then indurated (hardened), then recolonized.[1][2]

References
  1. Colin F. Klappa (1979). "Lichen Stromatolites: Criterion for Subaerial Exposure and a Mechanism for the Formation of Laminar Calcretes (Caliche)". Journal of Sedimentary Petrology. 49 (2): 387–400. doi:10.1306/212F7752-2B24-11D7-8648000102C1865D.
  2. Paleobotany: The Biology and Evolution of Fossil Plants, Edith L. Taylor, Thomas N. Taylor, Michael Krings, page 119,


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