This document summarizes the geologic history of Colorado through a series of formations and events over the past 1.7 billion years. It describes how the Colorado landscape was formed from ancient seas and tropical environments, followed by mountain building events like the Laramide Orogeny around 70 million years ago. It also discusses more recent uplift and the Pleistocene ice age that helped shape the Rocky Mountains to their current form.

1. Graphic created by Eduardo Iturrate at Research Systems, Inc. COLORADO MOUNTAINS Plains Mountains Colorado Plateau San Luis Valley North, Middle, South Park

2. Never summer Rampart Range Uinta Mtns Needle Mtns Wet Mtns Medicine Bow Uncompahgre Mtns Colorado Mtns

3. Boulder Area Stratigraphy Be able to reproduce this figure on test!