Across
- 2. result in organic matter converting into stone or a similar substance (replacement & permineralization)
- 3. groundwater carries dissolved minerals into the pores and cavities of bone, wood, or shells
- 9. (of a species, family, or other group of animals or plants) having no living members; no longer in existence
- 10. indirect evidence of life in the past rather than the body of the animal itself
- 11. most accurate form of dating finding the half-life of an element to determine the actual time of a fossil
- 12. water dissolves the original solid material and replaces them with mineral matter such as calcite, silica, pyrite, and hematite
- 13. process of determining if one rock or geologic event is older or younger than another
- 14. resin is excreted from certain plants and the sticky resin captures insects other invertebrates which harden and is preserved in the resin along with the DNA of the organism
Down
- 1. the process by which all substances of plants and animals decay except carbon
- 4. these indicate boundaries in geological time (easily recognizable, abundant, wide geographic distribution, lived a short period of geological time)
- 5. an era of geological history ending about 280 million years ago which came before the Mesozoic and in which vertebrates and land plants first appeared.
- 6. newer rocks on the top are younger than the ones on the bottom
- 7. (252-66 million years ago) means 'middle life' and this is the time of the dinosaurs. This era includes the Triassic, Jurassic, and Cretaceous Periods
- 8. an animal becomes trapped in tar or ice and the whole body can be preserved