“Alison’s Timeline of Life now has a number of important features, including the five great extinctions, the Cambrian biota, the Devonian explosion of plant life, and illustrations of the synapsid lineage, which led to mammals. I was pleased to help with the hard work of updating this valuable learning material for Montessori elementary classrooms. – Priscilla Spears, Ph.D.”

• Control chart
• Mute chart
• Precut picture cards/decals and era labels
• Research cards (printed)