Yule Marble
Timeline
Development of Yule Marble is put into context with Colorado geology by showing the passage of time from earliest rock units to the present with "Ga" = billions of years ago and "Ma" = millions of years ago.

Yule Marble

Section Title: Timeline
Table Section Text: Development of Yule Marble is put into context with Colorado geology by showing the passage of time from earliest rock units to the present with "Ga" = billions of years ago and "Ma" = millions of years ago.

Start	End	Geologic activity

1.78Ga	1.65Ga	Colorado forms (age of oldest exposed rocks found to date).

350Ma	324Ma	Leadville Limestone formed in a shallow, warm sea that covered Central Colorado through the accumulation of calcite from the remains of marine life.

300Ma	248Ma	Ancestral Rockies start and eroded away. The town of Marble was located at the edge of the Ancestral Rockies.

248Ma	70Ma	Area was a flat coastal plain over which dinosaurs roamed and during the later part was covered by another shallow sea.

72Ma	40Ma	1st of 3 uplifts (Laramide orogeny) of present-day Rockies but partially erodes.

34Ma	28Ma	2nd of 3 uplifts of the present-day Rockies. Volcanic activity with magma intrusions pushing up from below crystallized the limestone into marble.

25Ma	5Ma	Colorado Mineral Belt forms

10Ma	Present	3rd of 3 uplifts of the Rockies - Colorado

Sentence(s)

The Yule Marble of Leadville Limestone was deposited 350 million to 324 million years ago.

final_sentence: The Yule Marble of Leadville Limestone was deposited 350 million to 324 million years ago.