Columns
31
Packages
338
Units
1,337
Age
1,200–0 Ma
(1.2 Gyr)
Area
1,003,289 km²
Max thickness
21,791 m

Fossils

Collections
3,774

References

2
  • Paleobiology Database. 2015.
  • Childs, O.E. Correlation of stratigraphic units of North America; COSUNA. AAPG Bulletin 69:173-180. 1985.