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

Geologic Time Period

• Precambrian - 4.565 Billion Years Ago - 545 Million Years Ago (M.Y.A.) (4.6 Billion - 570)
• 1.7 Billion Years Ago
• [Boulder Creek Batholith]
• [Idaho Springs Batholith]
• [Idaho Springs Batholith - Apex Trail]
• [Idaho Springs Batholith - Chimney Gulch]
• 1.050 Billion Years Ago - Pikes Peak Batholith
• Pikes Peak Batholith
• 320-286 (300-265) Million Years Ago - Fountain Formation -
• Fountain Formation
• Fountain Formation
• Fountain Formation
• Fountain Formation
• Fountain Formation