Just as the rings of a tree convey its age, the layers of rock at Colorado National Monument whisper at the history they have seen. Some of the youngest geologic formations date from the Jurassic Period. That was 150 to 200 million years ago. The oldest are Precambian. This era occurred over 1.5 billion years in the past. You would have to be a geologist to know the difference. So just marvel at their stunning beauty as you drive by them.
