Fossil Types.

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Presentation transcript:

Fossil Types

A. Petrified Fossils 1. Organism covered by sediments 2. Water with dissolved mineral seeps between cells 3. Over time, water evaporates, leaving hardened minerals

Ex. Petrified Wood

Ex. Dinosaur Dig

Molds 1. Organism covered by sediments 2. Organism dissolves, leaving hollow area in rock (ex. Jello mold)

Ex. Leaf Mold

c. Casts 1. Water deposits minerals and sediments in mold, leaving a copy of the organism’s shape

Ammonite Shell Cast

D. Carbon Films 1. Organism covered by sediments 2. Gases escape, leaving thin film of carbon on rock

Ex. Carbon Film of leaf

Trace Fossils 1. Instead of organisms shape, shows activity (ex. Dinosaur footprints)

Ex. Trace Fossil

F. Preserved Remains 1. Organism preserved in tar, amber or frozen 2. Does not decay

Ex. La Brea Tar Pit Excavation

Ex. Insect in Amber

Ex. Frozen Woolly Mammoth Discovered in 1999; preserved for 23,000 years in Siberia

Can you identify the fossil type? Petrified Fossils

Preserved Remains

Carbon Film

Petrified Fossil

Trace Fossil

Cast (left side) Mold (right side)