Denver Formation

It ranges in age from latest Cretaceous (Maastrichtian) to early Paleocene, and includes sediments that were deposited before, during and after the Cretaceous-Paleogene boundary event.

[1] The Denver Formation consists of alluvial fan, fluvial, and paludal deposits that accumulated at the foot of the growing Rocky Mountain Front Ranges.

[10] Several early Paleocene lava flows are present in the upper part of the Denver Formation at North and South Table Mountain near Golden, Colorado.

The Ralston Dike, a body of intrusive monzonite located several miles to the northwest, probably represents the volcanic vent from which the flows erupted.

The lava flows in the upper part of the formation are about 62 to 64 million years old according to radiometric dating,[8] which places them in the early Paleocene Epoch.

Geologists examining an ancient stream bed deposit in the Denver Formation, exposed below the lava flows on the western slopes of North Table Mountain .
Edmontosaurus
Pachycephalosaurus
Triceratops
Ornithomimus
Tyrannosaurus