Counting marmots…
Lava flows southwest of Glenwood Springs, Colorado, have been broken by numerous faults with a few tens to several hundreds of feet of perpendicular separation. Flexural slip in steeply upturned Upper Cretaceous and Tertiary strata beneath the lava flows is believed to be responsible for this faulting. Tilting of the basalt and adjoining basalt gravel surfaces, as well as simple flexural-slip model experiments, seems to indicate that faulting was the result of a partial unfolding of previously folded strata. Subsidence of the uplift between Glenwood Springs and Carbondale or rise of the basin in the vicinity of the faulted lava by a few thousand feet since the basalt was formed is offered as an explanation.
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