Marine Fossils Found in Iowa

During the early Paleozoic, much of Iowa was covered by a shallow sea. Over millions of years the sea levels rose and fell with the Earth’s climate changes. During the millions of years that Iowa was covered by shallow seas, marine invertebrates flourished. The diverse marine life included a multitude of coral species: trilobites, brachiopods, gastropods, crinoids, bryozoans and cephalopods.

Why are marine fossils found in Iowa?

• Where are marine fossils found in Iowa?
• How do fossils help us learn about changes in life and on Earth?
• How has life in Iowa developed and changed over time?

Students could:

• Engage in small groups by asking students to compare and contrast Iowa marine fossils and modern sea shells/snail shells (Brachiopods can be collected at the Fossil & Prairie Preserve in Rockford.).
• Share the phenomenon and discuss the diversity of marine life in Iowa.  
• Take students on a field trip to either the Devonian Fossil Gorge in Coralville or Fossil & Prairie Preserve in Rockford, Iowa.  Contact a local rock quarry and ask if they have fossils you could use in your classroom. You could also ask the rock quarry’s geologist if they would speak to your students.

• Floyd County Conservation | Fossils:  This story highlights the fossils found at the Fossil & Prairie Preserve in Rockford, Iowa.
• Iowa PBS | Iowa Pathways: Devonian Fossil Forge This resource explores the Devonian Fossil Gorge located near the Coralville Dam.