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Unit 5 Fossils

Earth's Living History

QuestionAnswer
brachiopods small animals without backbones, look like clams
bryzoans small animals without backbones, lived in small groups
Carbon Film A thin coating which consists mostly of the chemical element carbon
Cast A model of an organism formed when sediment FILLS a mold and hardens
continental drift the gradual movement of the continents across the earth's surface through geological time.
Fossil The remains or traces of an animal that lived long ago
fossil record all the fossils in earth's rock layers ever discovered on Earth
Geologic Relating to the study of the Earth's physical structure
Index Fossil A fossil of a type of organism that lived in MANY places during a short time
Mass Extinction A period which a large number of species become extinct
Mold An impression formed when sediment hardens AROUND the organism
Paleontologist A scientist who studies fossils to learn about organisms that lived long ago
Petrified Organic matter changed into stony substance, "petrified wood
petrified wood When minerals replace the plant material in a piece of wood.
Preserved Maintain something in its original or existing state
relative age The age of a rock compared to the ages of rock layers
Sedimentary Fossils are found in this rock
timescale the period of time that it takes for something to happen or to be completed in units
Trace Fossils A fossil of a footprint, trail, burrow, or any other trace of an animal that is not of the animal itself
Trilobite an extinct marine arthropod that occurred abundantly during the Paleozoic Era
trilobites Animals both had exoskeletons and three body segments
Created by: twaltner
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