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Types of Fossils

Interactive passage with audio narration, comprehension questions, and printable PDF.

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Format: Interactive (Online), Printable (PDF)
Grades: 345
Subjects: scienceelareading
Standards: NGSS 4-ESS1-1ESS1.C
Languages: English, Spanish

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What's included

Reading passage

Reading comprehension

Audio narration

With word word highlighting

Comprehension quiz

Auto-graded

Writing activity

Open-ended response

Glossary & flashcards

Vocabulary practice

Differentiated version

Adapted for varied levels

Spanish translation

Bilingual support

About this reader

This engaging 250-word reading passage introduces fourth-grade students to the four main types of fossils and how each forms. Aligned with NGSS 4-ESS1-1 and ESS1.C: The History of Planet Earth, the passage explains body fossils (preserved remains like bones and teeth), mold fossils (impressions left in rock), cast fossils (mineral-filled molds), and trace fossils (evidence of organism activity like footprints). Written at a Grade 4 reading level, the passage uses clear definitions and relatable examples to help students understand how different preservation methods create different types of fossils. The audio-integrated lesson includes a simplified differentiated version for struggling readers, Spanish translations, a comprehensive glossary of key terms, multiple-choice questions testing recall and comprehension, writing activities requiring explanation and application, and graphic organizers for comparing fossil types. Students learn that each fossil type provides scientists with unique information about ancient organisms and their behaviors. This foundational knowledge prepares students for hands-on fossil investigations and supports understanding of Earth's history through the fossil record.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

"Ammonite Fossil Found on Mayne Island" by MarcStevenBC / Wikimedia Commons.

Fossils are the preserved remains or traces of organisms that lived long ago. Scientists study fossils to learn about plants and animals from Earth's past. Understanding different types of fossils helps scientists piece together what life was like millions of years ago.

There are four main types of fossils. Body fossils are the preserved remains of actual body parts. These include bones, teeth, and shells that turned to stone over millions of years. When a dinosaur died, its bones might become body fossils that scientists can study today.

Mold fossils form when an organism leaves an impression in mud or sand that hardens into rock. Think of pressing your hand into wet cement—the handprint that remains is like a mold fossil. The organism itself is gone, but its shape stays behind.

Cast fossils form when a mold fossil fills with minerals that harden. The minerals create a rock copy of the original organism, like pouring plaster into a mold to make a statue. Cast fossils show the outside shape of ancient organisms.

Trace fossils are different because they are not body parts at all. These fossils show evidence of an organism's activity. Footprints, burrows, and even fossilized droppings are trace fossils. They tell scientists how ancient organisms moved, ate, and lived.

Each type of fossil provides different clues. Body fossils show what organisms looked like. Mold and cast fossils preserve shapes. Trace fossils reveal behaviors. Together, these fossils help scientists understand Earth's history.

Interesting Fact: The largest dinosaur footprint ever found is 5.7 feet long! This trace fossil came from a giant plant-eating dinosaur that lived about 150 million years ago.

What are fossils?

Rocks from outer spacePreserved remains of ancient organismsModern animal bonesTypes of minerals

Which fossil type includes bones and teeth?

Trace fossilsMold fossilsBody fossilsCast fossils

How do mold fossils form?

Bones turn to stoneOrganisms leave impressions in hardening mudMinerals fill empty spacesAnimals leave footprints

Why would a paleontologist study trace fossils?

To see organism shapesTo find dinosaur bonesTo learn how ancient organisms behavedTo collect shells

What happens when minerals fill a mold?

The mold disappearsA cast fossil formsA trace fossil formsThe organism comes back

Which is an example of trace fossil?

A dinosaur toothA shell impressionDinosaur footprintsA fossilized bone