Definitions
The perserved remails of a once-living organism.
What is Fossil?
A term applied to a species that was once living but now is not.
What is extinct?
This happens to the remains of a plant or animal when it dies.
The most common meas by which a dead organism can be perserved is by the formation of this.
What is a mold by making a cast?
Fossils in many layers above the General Unconformity.
What are trilobites?
Water is required for this to occure because it has a lot of minerals in it.
What is petrification?
The sum total of all discovered fossils is this.
What is the fossil record?
A thick slowly flowing liquid produced by plants that can harden into a solid.
What is a resin?
Does a fossil mold or cast form first?
What is a fossil mold?
The conversion of organic material into rock.
What is pertification?
A creature that can live on land and in water.
What is amphibians?
The remains of a plant or animal are encased in sediment, and the sediment eventually hardens into rock. As the remains of the plan or animal disintegrate, a hole is left in the rock, in the shape of the original remans. That is the mold. The mold might fill up with sediment or magma later and when the filling hardens, it forms a cast. What is this an example of?
What is petrification and why it produces fossils with more information than fossil casts?
Chemical reactions that take place leaving a thin filmy residue composed mostly of carbon.
What is carbonization?
Strange looking fish that are assumed to be extinct.
What are placoderms?
Can you learn much about the thickness of an organism from carboized remains?
No you cannot. Carbonized remains come as a result of the organizm being squished. Thus they give you a nice two dimensional view of the organizm but you learn little about its thickness.