Microbial mudmound reef tract with dasyclad green algae.
Island arc carbonate sequence.
Mound core lense-like bodies of massive micritic limestone with numerous remains of dasyclad algae. No stromatactis. Flank beds with nodular algal limestone and some tabulate corals

From Copper
a late Caradoc, possibly  also (?) Ashgill microbial mudmound reef tract from the Anderken Fm., with dasyclad green algae, is described (Nikitin, 1973; Nikitin et al., 1974; Nikitin et al, 1996). One reef is c.150m thick and about1500m across. Such reefs have physical similarities with those of the Boda Limestone of Sweden. The age of some of these mounds is not firmly established for some of the Caradoc mounds may be partly of Ashgill age. The Betpak-Dala locality  is the central part of the arcuate Ordovician reef tract, with a southern extension for 600km to southern Kazakhstan,  at the northern Tyan Shan range (Chon-Kemi River, N of Issuk-Kul Lake, near Alma-Ata). The other half reaches north to Stepnyak in northern Kazakhstan, W of the Irtysh River: total length of this island arc carbonate sequence is over 1500km (Zadoroshnaya & Nikitin, 1990)