Hike of the Week : Dinosaur Ridge is a window to lost worlds
By James Woodruff, Camera Staff Writer
“THE BONE-BEARING LAYER OF THE JURASSIC AGE IS THE MORRISON FORMATION. THAT FORMATION IS VERY IMPORTANT TO PALEONTOLOGISTS ALL OVER THE WORLD.”Karen HesterDirector, Dinosaur Ridge Visitor Center
Take a hike along an exposed piece of geologic history, the Dinosaur and Dakota Ridge trails east of Morrison.
Located at the junction of Colo. 26 and Interstate 70, the trail is about 26 miles from Boulder and can be reached by taking Colo. 93 south past the U.S. 6 junction. Take U.S. 6 east for about three miles to U.S. 40 and head south on 40 to the junction of Colo. 26 and I-70. Parking can be found to the left.
The northern extremity of Dinosaur Ridge lies brilliantly exposed by the I-70 roadcut. A walk along its base will reveal the multicolored anatomy of about five geologic formations covering roughly 70 million years.
“As you pass along the cut from the west, you pass a formation below the Dakota called the Morrison Formation,” said William Braddock, University of Colorado professor of geology. “Emerging out of the roadcut on the eastern side, the Dakota sandstones give way to younger shale deposits of the Benton, Niobrara and Pierre formations.
“The Dakota is mostly sandstone, and it`s harder than the mostly shale layers above and below it,” Braddock said. “So the Dakota hogback forms a bump on the top of the ridge.”
The area is the site of the first discoveries of the herbivorous dinosaurs Stegosaurus armatus and Apatosaurus ajax.
“The bone-bearing layer of the Jurassic Age is the Morrison Formation,” Karen Hester, geologist and director of the Dinosaur Ridge Visitor Center, said. “That formation is very important to paleontologists all over the world.”
The rock unit, spanning thousands of square miles, was named for the town of Morrison, where it is most conspicuously exposed.
Visitors to Dinosaur Ridge can begin their hike on the eastern side of the ridge. Interpretive signs lead to a dinosaur footprint site and describe the geologic history of the Denver Basin. Dakota Ridge Trail ambles along the Ponderosa-topped ridge to the north for about two miles.
“During the time the Morrison and Dakota deposits were being formed,” Braddock said, “this region must have been really boring __ flat with some streams wandering around. There were no mountains here at all.”
Today, the region is anything but flat. For bicyclists, hikers and geology enthusiasts alike, it is far from boring. Visitors will be treated to 360-degree vistas, a deeper insight into earth history and a superlative workout.
For information on guided tours, call Friends of Dinosaur Ridge at (303) 697-3466.
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