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Across
  1. 4. A Cretaceous-age rock layer in Kansas formed from ancient marine shells.
  2. 6. Preserved remains or traces of ancient organisms found in rock layers.
  3. 8. A sedimentary rock made mostly of calcium carbonate from marine organism shells.
  4. 9. The chemical substance that makes up seashells and limestone.
  5. 10. A visible exposure of rock at Earth’s surface, often seen along roads or stream banks.
Down
  1. 1. ___Period; The geologic time period, about 95–90 million years ago, when the Greenhorn Limestone formed.
  2. 2. A large, thick-shelled marine fossil commonly found in Greenhorn Limestone.
  3. 3. A type of rock formed from layers of deposited material over time.
  4. 5. A fine-grained sedimentary rock formed from mud and clay that alternates with limestone layers.
  5. 7. Western Interior __; The shallow sea that once covered Kansas and split North America during the Cretaceous Period.