Exploring Geologic Time and Fossils

What is an unconformity in geology?

• A type of rock layer that forms under water

• A gap in the geologic record where rock layers are missing

• A fossil that is used to identify a specific time period

• A method of dating rocks using radioactive decay

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DOK Level 1: Recall

Which of the following best describes the use of index fossils?

• They are used to determine the absolute age of rock layers

• They help in correlating the age of rock layers across different regions

• They are fossils found only in volcanic rocks

• They are used to identify unconformities in rock layers

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DOK Level 2: Skill/Concept

How can a key bed be identified in a sequence of rock layers?

• By its unique and widespread presence across different areas

• By its color and texture

• By the type of fossils it contains

• By its thickness compared to other layers

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DOK Level 2: Skill/Concept

Explain how the geologic time scale is organized and its significance in understanding Earth's history.

• The geologic time scale is organized by the types of rocks found in each period and helps in identifying mineral resources.

• The geologic time scale is organized into eons, eras, periods, and epochs, and it helps scientists understand the sequence and timing of events in Earth's history.

• The geologic time scale is organized by the size of fossils found and helps in determining the age of the Earth.

• The geologic time scale is organized by the color of rock layers and helps in identifying climate changes.

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DOK Level 3: Strategic Thinking

Analyze the fossil records of two different regions. How can you determine if they were formed during the same geologic period?

• By comparing the color of the rock layers in both regions

• By identifying the presence of similar index fossils in both regions

• By measuring the thickness of the rock layers in both regions

• By checking the mineral composition of the rocks in both regions

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DOK Level 3: Strategic Thinking

Select the three types of rocks.

• igneous

• metamorphic

• volcano

• sedimentary

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NGSS.MS-ESS1-4