Stromatolites produced in the Guanling formation of layered dolomite in, the overall shape performance is dome shaped and branched, lumpy, internal development of laminated structure, composed of light and dark stripes are composed of stacking, stromatolite is composed of several basic layer, base layer overlapping or nested form column body, subject of growing and bifurcation form stromatolites. Stromatolite is a "quasi fossil" most common carbonate, organic sedimentary structure built in prokaryotes. Modern stromatolites are mainly grown in the intertidal zone, living in the water, can be out of the water.