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

A Theory | Seven Nations | Governments and Empires | Geological Past

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]

290 - 248.2 (286 - 245) Million Years Ago - Permian Period
280-255 (260-250) Million Years Ago - Lyons Formation

[Lyons Sandstone]

The Fountain Formation

Pebbles and small stones in Fountain Formation sandstone at Garden of the Gods Park

The pebbles and small stones deposited in streambeds and flats are visible in this close-up of Fountain Formation sandstone (Garden of the Gods Park).

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

Geologic Time Period

The Fountain Formation

Garden of the Gods Park (Fountain Formation)