1. Finding Relative Age

2. Do Activity 12-D Part II on p. 263

8. Answer “Discussion” Questions p. 263

9. The Law of Superposition: -In sedimentary rock, the older layers are found towards the bottom and younger layers towards the top. http://www.purchon.com/ecology/images/strata.jpg Older rock Younger rock

10. The Crosscutting Rule -Any event that disturbs a rock is always more recent than the rock itself. The dike is younger than the strata

13. Fossils in the form of shells, bones or imprints become encased in sedimentary layers. Fossils in deeper layers are ____er than those above. http://www.bbc.co.uk/schools/gcsebitesize/img/bifossils.gif

14. Fossils in the form of shells, bones or imprints become encased in sedimentary layers. Fossils in deeper layers are _OLDer than those above. http://www.bbc.co.uk/schools/gcsebitesize/img/bifossils.gif

15. Fossils found in the deeper layers of the Grand Canyon are quite unfamiliar! (Living things have changed!) http://dommy.com/alan/pix/grand-canyon.jpg ?

16. Olenellus (a trilobite) first appeared about 550 million years ago and became extinct about 250 million years ago. Rock with trilobite fossils are between ____ and ____ million years old. http://sun2.science.wayne.edu/~geology/GEO1010/images/home/Trilobite.gif

17. An index fossil is a fossil that is useful for indicating the geological time when a sediment was deposited. A paleontologist – a scientist who studies ancient life forms. http://www.msnucleus.org/membership/html/jh/earth/stratigraphy/images/paleontologist.gif

19. Do Activity 12E on page 266

20. The Standard Geological Column -an imaginary collection of all the sedimentary rock layers and their fossils from everywhere in the world! http://www.abheritage.ca/abnature/geological/photos/rock_col umn_thu.jpg

21. Named after 2 Celtic Tribes Named after Jura mountains in Switzerland

22. Do Review 12.3 on page 269