Across
- 1. A rock formed when mud and clay get compacted over time
- 4. Has both a rock and mineral form; is industrially used to make cement
- 7. Modern corals that make up today's reefs
- 8. A rugose coral that grows in a cone shape
- 10. A sessile marine organism that has bilateral symmetry; very common in Ohio
- 12. A carnivorous jawed fish whose best fossils were found in the Cleveland Shale
- 14. A rock composed of pebbles, or clasts, cemented in a matrix
- 15. A rock formed from sand grains, mostly quartz or feldspar
Down
- 2. A rock mostly made from calcite and often contains fossils
- 3. A rock made of cryptocrystalline quartz that was used to make ancient tools
- 4. A mollusc that moves by sliding and has a coiled shell (ex: snails)
- 5. A type of bivalved mollusc that sometimes burrows into the seafloor (ex: clams)
- 6. An extinct marine animal with a segmented body; Ohio's state fossil!
- 9. May be regular or irregular (ex: sand dollars)
- 11. An organism with a thin stalk and short arms, also called sea buds
- 13. An organism that attaches to the seafloor with a stalk and has five-sided symmetry