Tha Rae Stromatolitic Rocks

The site is a small creek about 6-7 meters wide flowing from north to south about 50 meters in distance with an exposure of rock along the creek on the west of Ban Pa Fang.  The rock is characterized by stromatolitic thin-bedded limestone dipped toward the northeast about 25 degrees with a large nautiloid presented in the rock. The rock features are closely related to the rock of the Late Ordovician Pa Kae Formation.

 

Stromatolites (/strˈmætəlts, strə-/[1][2]) or stromatoliths (from Greek στρῶμα strōma "layer, stratum" (GEN στρώματος stromatos), and λίθος lithos "rock")[3] are layered bio-chemical accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains by biofilms (microbial mats) of microorganisms, especially cyanobacteria.[4] Fossilized stromatolites provide ancient records of life on Earth by these remains, some of which may date from 3.7 billion years ago.[5][6] Lichen stromatolites are a proposed mechanism of formation of some kinds of layered rock structure that are formed above water, where rock meets air, by repeated colonization of the rock by endolithic lichens