Eocene boulder conglomerate

Geologist Dr. Charles Chapin
lecturing in front of an outcrop of Boulder Conglomerate.
 Prior to the eruption of Wall Mountain Tuff, some valleys in the region were filled with eroded rocks and debris, named the Echo Park Alluvium, basically debris from the surrounding mountains. Over 2 million years passed between the deposition of the Wall Mountain Tuff and deposition of the volcanic material into the ancient lake at Florissant. In that time, much of the Wall Mountain Tuff was eroded away, leaving only scattered hints of its once immense lateral expanse. In place of the Wall Mountain Tuff, filling the valleys and draping over the landscape once occupied by the tuff, was deposited the Tallahassee Creek Conglomerate.
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