A Geological Tour of Denver, Golden, and Colorado's Front Range

Geologic Time Period

• Precambrian - 4.565 Billion Years Ago - 545 M.Y.A.
• [Boulder Creek Batholith]
• [Idaho Springs Batholith]
• Pikes Peak Batholith
• Fountain Formation
• Lyons Sandstone
• Lykins Formation
• Inland Sea - Seashore
• Pierre Shale
• Fox Hills Formation
• 69 M.Y.A. - Laramie Formation Sand Dunes
• Laramie Sandstone
• Laramie Sandstone
• Laramie Sandstone
• Laramie Sandstone
• Laramie Sandstone
• 65.5 M.Y.A. - Yucatan Asteroid collision