Smith, a sedimentary geologist with ... there's Mushroom Rock State Park, which has unique, mushroom-shaped sandstone features that seem to sprout from the ground like it was a giant's garden.

The Coconino Sandstone layer was deposited not by the ... and corals. These layers of sedimentary rock were deposited in Cambrian time, when another shallow sea covered this region.

Chalk, limestone, shale, and sandstone are all examples of sedimentary rocks. All these different sedimentary rocks are formed from the broken remains of other rocks that become joined together.

The gigantic Yellowstone Grand Canyon, lined with volcanic rock. With all the effects of hydrothermal activity, river erosion ...

Oak Park is a 9-acre park situated on one of the many sedimentary ... beautiful ledges made of sandstone, limestone, shale and coal. It's a great spot for experienced rock climbers, with dozens ...