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

Geologic Time Period

• Precambrian - 4.565 BYA - 545 MYA
• [Boulder Creek Batholith]
• [Idaho Springs Batholith]
• Pikes Peak Batholith
• Fountain Formation
• Lyons Sandstone
• Lykins Formation
• Table Tops
• Green Mountain
• Castle Rock Rhyolite
• 34.1 M.Y.A. - Guffey volcano lahar
• Florissant Fossil Beds
• Florissant Fossil Beds
• Florissant Fossil Beds
• Florissant Fossil Beds
• 1.8 (1.6 - 0) M.Y.A. - Present - Quaternary Period