Fossils and Geologic time scale

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Across
  1. 1. Extinction is the termination of a kind of organism or of a group of kinds, usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point.
  2. 5. dating is the science of determining the relative order of past events, without necessarily determining their absolute age.
  3. 8. the boundary in geologic time.
  4. 9. happens when water dissolves the original solid material and replaces them with mineral matter.
  5. 10. The Mesozoic Era meaning "middle life" is the middle of the three geological eras of the Phanerozoic Eon. It lasted from about 252 to 66 million years ago. It is also called the Age of Reptiles and the Age of Conifers. The Mesozoic was preceded by the Paleozoic and succeeded by the Cenozoic.
  6. 12. provides indirect evidence of life
  7. 14. the past rather then the body and the animal itslef.
  8. 15. The Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from 541 to 251.902 million years ago, and is subdivided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.
  9. 16. is a process of fossilization in which mineral deposits form internal casts of organisms. Carried by water, these minerals fill the spaces within organic tissue
  10. 17. is an axiom that forms one of the bases of the sciences of geology, archaeology, and other fields pertaining to geological stratigraphy.
Down
  1. 2. an animal that can be trapped in tar and get the whole body preserved.
  2. 3. the process by which organic matter exposed to minerals over a long period is turned into a stony substance
  3. 4. is exerted from plants which protectects them from insects and seals off plant injuries.
  4. 6. dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometer or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy.
  5. 7. The Cenozoic Era meaning "new life" is the current and most recent of the three geological eras of the Phanerozoic Eon. The Cretaceous–Paleogene extinction event is the boundary between preceding Mesozoic era and the Cenozoic, which extends from 66 million years ago to the present day.
  6. 11. plants and animals decay except carbon.
  7. 13. the process by which all substances