Types of Fossils and the Geological Time Scale

Define the term geological time scale.

• A record of the geological events and the evolution of life forms as shown in the rock and fossil records.

• A scale that records the events of geological events.

• A record of events in chronological order.

• A timeline of geological events.

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Division of Earth's history into time units based largely on the types of life forms that lived only during certain periods.

• Phanerozoic Eon

• Geologic Time Scale

• Era

• Single Cellular

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Longest subdivision in the GTS that is based on the abundance of certain types of fossils and is subdivided into eras, periods, and epochs

• Phanerozoic Eon

• Geologic Time Scale

• Period

• Eon

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According to the diagram, which of the following statements is true?

• Fossil C and D are the same age.

• Fossil C is younger than Fossil D

• Fossil B is youngest

• Fossil A is oldest.

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What  are  Trace Fossils?

• indirect evidence of life  Tracks, burrows, coprolites(fossilized scat), gastroliths (polished stomach stones)

•  harden resin of ancient trees

• mineral-rich groundwater permeates porous tissue (bone/wood), minerals will fall out of solution and fill pores

• shell or another structure buried in sediment then dissolved by groundwater, a mold is created

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What  are  Index Fossils?

• widespread geographically and limited to a short span of geologic time

• 1700s specific types of fossils found in certain sedimentary layers and not in others

• Fossils document the evolution of life through time

• Allows us to recognize what intervals of time are not represented by strata and thus missing from fossil record

Which fossil is a replica of the original shape of the organism?

• cast

• mold

• trace

• preserved remains

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The Geologic Time Scale is a record of what?

• old geologists

• sweet geology music

• the known history of rocks and fossils

• a list of every living thing ever

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What is a fossil?

• A preserved remain or trace of a once-living organism

• A type of rock

• A mineral deposit

• A type of soil

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Which of the following is a type of fossil?

• Sedimentary rock

• Igneous rock

• Trace fossil

• Metamorphic rock

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