Across
- 2. is the number of years that have passed since the rock had formed
- 3. a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
- 7. a slab of volcanic rock formed when magma squeezes between layers of rock
- 10. A layer which has been weathered and eroded by water. Different then the other layers.
- 14. The age of a rock compared to the ages of rock layers
- 15. States that the intrusions is younger than the layer(s) it cross-cuts. (Dike, sill, batholith).
Down
- 1. The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.
- 4. (of a species, family, or other group of animals or plants) having no living members; no longer in existence.
- 5. entrance by force or without permission or welcome
- 6. A bend in the rock strata.
- 8. States that the inclusion is older than the layer it is in.
- 9. a long and distinct period of history with a particular feature or characteristic.
- 11. An extreme coating of carbon on a rock
- 12. Length of time required for half of the radioactive atoms in a sample to decay
- 13. A crack in the earth's crust.