A rock slide has damaged a popular trail in Boulder Canyon. The City of Boulder Open Space and Mountain Parks Department has temporarily closed Boulder Falls because of that damage. Boulder officials said the safety closure is a proactive measure due to recent weather conditions that likely triggered soil movement.

The boulder will require downsizing to remove it from the highway. CDOT said it is unknown when the highway will reopen.

Boulder Falls — the popular waterfall destination located directly off of Boulder Canyon Drive — will remain closed due to a recent rockslide.

Geologists found evidence in the way enigmatic sandstones called Tava formed in the Rocky Mountains hundreds of millions of years ago.

Around 700 million years ago, the Earth cooled so much that scientists believe massive ice sheets encased the entire planet like a giant snowball. This global deep freeze, known as Snowball Earth, endured for tens of millions of years.