Time Marches on......

1. the period in which glaciers had formed in the pole
5. the period in which the dinosaurs came to an end
6. this period was in the ocean
7. the period in which earth turned green and started to grow plants
8. the period in which hominids appear
9. the period where life first evolved
10. the scientific study of fossils
12. the land mass made from the collided continent
14. a unit of geological time into which eras are divided
16. the standard method used to divide the Earths history into manageable parts
19. the age of the dinosaurs
20. a mark or cavity made in a sedimentary surface by a shell or other body
21. the death of every member of a species
22. fossils a fossil used to date other fossils
23. the trace or remains of organisms that lived long ago
24. a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
25. a subdivision of a geological period

2. a principal that states the geoligical process that occured in the past can be explained by current geological processes
3. a unit of geological time that includes two or more periods
4. a principal that states the geologic change occurs suddenly
11. the largest division of geological time
13. there were 4 of these in all time
14. the period in which the continents came together
15. fossil a fossilized mark that is formed in soft sediment by the movement of an animal
17. was a 20th century vertebrate paleontologist who focused on the study of dinosaurs
18. the period of swampy forest