The Clock of Eons

Three Part Cards: 51 cards

• 17 pictures
• 17 labels
• 17 definitions

Booklets:

• 2 booklets

Wallcharts:

• 4 wallcharts

Poster 12″ x 18″

Puzzle chart and pieces (uncut) 12″ x 12″

Eons and Eras strip 31″ x 1.5″ (when assembled)

Black outlined master 8.5″ x 11″

Eons and Eras represented:

• Hadean Eon
• Archean Eon
• Proterozoic Eon
• Phanerozoic Eon
  • Paleozoic Era
  • Mesozoic Era
  • Cenozoic Era

Printed in full color on tear and water proof plastic, no lamination needed.

The Clock of Eons* provides an overview of Earth’s temperature, tectonic activity, atmospheric composition, and biological life from Earth’s formation until the present time. The relationship among these features is an important foundation for understanding our Earth. Tectonic activity (e.g.- volcanic eruptions) can alter atmospheric composition and temperature, which, in turn affects life.

*Traditionally, the name of this material has been The Clock of Eras. The majority of Earth’s history, however, is enclosed in the bigger units, the eons as depicted on the International Chronostratigraphic Chart. We at Montessori Research & Development believe that The Clock of Eons is a more adequate name for the material.