subperiod

subperiod
n.

* * *


Universalium. 2010.

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  • Carboniferous Period — Interval of geologic time 354–290 million years ago, marked by great changes in world geography. All the landmasses drew closer together as a result of tectonic plate movements. The supercontinent Gondwana occupied much of the Southern Hemisphere …   Universalium

  • amphibian — /am fib ee euhn/, n. 1. any cold blooded vertebrate of the class Amphibia, comprising frogs and toads, newts and salamanders, and caecilians, the larvae being typically aquatic, breathing by gills, and the adults being typically semiterrestrial,… …   Universalium

  • Carboniferous — For the album by Zu see Carboniferous (album). Carboniferous Period 359.2–299 million years ago …   Wikipedia

  • Mississippian — For other uses, see Mississippian (disambiguation). Not to be confused with the Mississippian period describing the dominance of the Mississippian culture. System Subsystem/ Series Stage Age (Ma) Permian Cisuralian Asselian …   Wikipedia

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