The owner of a limestone quarry above Glenwood Springs has spent several years arguing that its contentious plan for an ...

It was not intentional. There is no excuse. It’s really disheartening what occurred,” said developer David Martin.

Limestone, made from calcium carbonate, takes millions of years to form. These sedimentary rocks are born from the decay and fossilization of marine organisms — think coral and clams.

Shake holes are formed in limestone landscapes when boulder clay is washed down through cracks or gaps in the underlying limestone.