10/10/09. Sedimentary rocks are layered rocks. The gray on the bottom is the oldest part of the rock. Sandstone transformed into brown rock. The rocks.

10/10/09

Sedimentary rocks are layered rocks. The gray on the bottom is the oldest part of the rock. Sandstone transformed into brown rock. The rocks formed 100,000 million years ago. Water is vital in the forming of sedimentary rocks.

Trace fossils are traces of living fossils. The most abundant traces in Dinosaur Ridge are of crocodiles and dinosaurs.

This is the ocean dividing North America called the Western Interior. This is what Colorado looked like

100,000 million years ago.

Colorado

Clams and worms form holes in the sand, and, over millions of years, the sand dried and formed these trace fossils

The branches of ancient trees would fall in the sand, leaving traces like this behind.

Crocodiles created lengthy scratches that hardened into trace fossils.

Manta Ray nests are created when the sand mold transforms into rock.

Mangrove trees’ roots expand ubiquitously and various fish use them as a lair.

Water ripples are produced when liquids dry into rock.

These trace fossils are shaped when a dinosaur steps on the

surface of the soft riverbed.

Dino’s babies walk right by their parents’ side. This picture is of an iguanodon footstep.

If the dinosaur contained claws, it must be a meat-eater. If not it is a plant -eater or herbivore.

Meat-eater’s feet are skinnier than herbivore’s feet. This picture is of a Duckbill Dinosaur. It is an anaped. That means it walks on two legs.

Like most reptiles, iguanodons step one foot in front of the other.

An iguanodon is a plant-eating dinosaur that has a spike on each thumb.

Jack’s Index Layer is the cause of a Stegosaurs step. The bulge shows the imprint of the step.

The bulges occur when a dinosaur steps in a sandy area, and when the rock underneath the step dissolves, the step fossil is left in the rock.

Stegosauruses are the Colorado state fossil. It is usually 9 feet tall.

Duck Billed dinosaurs’ feet resembled a birds’ footstep.