Figure 6: Multibranched relative of starfish; lives attached to the ocean bottom; some living species "sea lilies" NAME: Want to watch this again later? Try Study. Guns, Germs, and Steel Study Guide. However, if the bone is 70, years or older the amount of 14 C left in the bone will be too small to measure accurately. What can a scientist do with these two outcrops?
Primitive armored fish; extinct.
Relative Dating with Fossils: Index Fossils as Indicators of Time
The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages. Plant ChemCast. But sometimes, a scientist finds a couple of rock outcrops that are separated by a wide distance. Primitive form of chordate; floating form with branched stalks; extinct NAME: Sign Up. Most isotopes found on Earth are generally stable and do not change. Your next lesson will play in 10 seconds.