WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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Geologists use trilobite fossils as 'index fossils' to correlate the relative age of sedimentary rock layers found in different continents. What properties make an organism an excellent index fossil?

The organism was geographically widespread, abundant, and existed for a relatively short geological time frame The organism lived in only one isolated cave and survived for billions of years The organism had soft body tissue that decomposed instantly The organism evolved continuously without ever going extinct

Correct Answer:

The organism was geographically widespread, abundant, and existed for a relatively short geological time frame

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