• Camarasus skull in the cliff face, rafters on the Green River, McKee Springs petroglyphs

    Dinosaur

    National Monument CO,UT

Ancient Plant Life

Although this area was a desert, the oases scattered among the dunes allowed some plants to survive. It is extremely difficult to preserve plants in a desert environment. To preserve something as a fossil, it must be buried as soon as possible. In a desert, the heat, sand, and wind tend to destroy plant remains so soon after they die that there is no time to bury them.

Cycads

Two types of plants have been identified in Glen Canyon fossils. The first is a cycad. Cycads look like short, fat palm trees or large ferns, although they are not closely related to either of those groups.
 
Cycad
Modern day Cycad plant.
Phil Bergman
 
Cycad
This fossil appears to be the rachis, or the central rib of the frond, with the bases of several leaves, called pinnae, coming off of it.  In this modern cycad on the right, one can see the central rib of the frond with the pinnae coming off of it, and how it looks similiar to the fossil on the left. 
National Park Service
 
Horsetail

© 2004 Steven J. Baskauf,

Horsetail

The other plant paleontologists have identified is a sphenophyte, or horsetail. These plants usually grow in wet areas, so if they were present in the desert, they were probably clustered in the wetter interdune areas. Horsetails consist of a single stem with needle-like leaves at regular intervals. At the joints where the needles are placed, there is usually a rigid ring in the stem.

 
Horsetail
Left photo shows one of the fossil horsetails found in the Glen Canyon.  The middle photo shows an outlined image of the fossil where you can see the rigid rings, as well as an outline of the stem and what might be a couple leaves, broken off but still in their original orientations. The right image is of a modern day horsetail plant.
National Park Service
 
Cyanobacteria

National Park Service

Other Plant-Like Life

Paleontologists have also found laminated (or layered) carbonates. These are formed when sediment sticks to a mat of cyanobacteria. (These tiny organisms are not plants, although they are sometimes inaccurately referred to as "blue-green algae.") Layers like these are described as stromatolitic, and they only form in standing water. In one place at least, then, there was actually water above the surface.

 

Did You Know?

Photo of tilted rock layers at sunrise.

Dinosaur National Monument's geology is a feast for the mind and the eye. The rock layers, which have been tilted by folding, expose a variety of colors and textures.