'Lower Carboniferous period' definitions:

Definition of 'Lower Carboniferous period'

(from WordNet)
noun
From 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects [syn: Mississippian, Missippian period, Lower Carboniferous, Lower Carboniferous period]

Definition of 'Lower Carboniferous period'

From: GCIDE
  • Mississippian \Mississippian\ prop. n.
  • 1. A geological period extending from from 310 million to 345 million years ago; it was associated with an increase of land areas, the presence of primitive ammonites, and emergence of winged insects; called also {Missippian period} and Lower Carboniferous period.
  • Syn: Missippian period, Lower Carboniferous, Lower Carboniferous period. [WordNet 1.5]
  • 2. A resident of Mississippi. [WordNet 1.5]