Mostly Epiphyton
Others are Girvanella and other blue greens.
120-140 m thick, 4-6 km long and 0.2-0.8 km wide.
Three reef buildung cycles.
Vertical zonation
Epiphyton patch reefs at base, Epiphyton-Girvanella reefs at top
Age just indicated as Lower Cambrian - but probably Botomian-Toyonian