The correct answer is option B.
Geologists have long used fossils to help identify parts of the rock record from around the world and Walter employed this strategy in studying the formations around Gubbio. Throughout the limestone he found fossilized shells of tiny creatures called foraminifera.
What are fossils?
Fossils are defined as the preserved traces, remain or impressions of the living organisms found in previous geological era.
For example, shells, skulls, bones and exoskeletons are the remains found buried in soil including imprints of microbes.
Other kind of fossils include carbon fossils and molecular fossils.
To put it simply, fossils are old dead remains of plants and animals that are more than ten thousand years old.
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