"Fallotaspidoidea" occur in the Lower Cambrian of North America (Cordilleran region and northern Greenland), Europe (United Kingdom, Comley area; Ukraine), northwestern Africa and northern Asia (Siberia) [REF].
Lieberman (2002)[REF] suggests that fallotaspidoids, the first hard-shelled trilobites (or Eutrilobites), originate in the paleocontinent Siberia.