Cambrian: Definition and Much More From Answers.com
An interval of time in Earth history (Cambrian Period) and its rock record (Cambrian ... and thus the start of the Palaeozoic era and the Cambrian period...
Geologic Time - Enchanted Learning Software
Cenozoic Era "The Age of Mammals" 65 mya through today, Quaternary Period "The Age of Man"... Cambrian Period "The Age of Trilobites" 540 to 500 mya...
Cambrian period
Cambrian period [Lat. Cambria=Wales], first period of the Paleozoic geologic era (see Geologic Timescale, table) extending from approximately 570 to 505...
Climate during the Carboniferous Period
Earth's climate during the Carboniferous Period is very similar to our climate today.
The Paleozoic Era
An overview of the era from the UC Berkeley Museum of Paleontology.
The Paleozoic Era
BobAinsworth.com - The Palaeozoic Era. An illustrated geological time line for the Palaeozoic era, which includes the Cambrian, Ordovician, Silurian,...
Cambrian Era
Cambrian Era
