Extinction

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Across
  1. 4. trace of a once existing organism
  2. 5. the broken down organism of an animal
  3. 6. combining elements or parts to form a whole
  4. 9. a data base which holds all the fossil records
  5. 10. place in sea that contains high concentration of salts
  6. 12. hole or tunnel in the ground
  7. 13. extinct genius of clupeid
  8. 14. genus of a trilobite
  9. 15. the formations of rock
Down
  1. 1. a prehistoric genus plant
  2. 2. sedimentary rock usually cemented together
  3. 3. makes impressions on a wall
  4. 7. stone mass containing fossilized fecal matter of animals
  5. 8. small species of land snail
  6. 11. broken down plant and dead plant remains