Slide 1Key Beds, Absolute Dating and FOSSILS- 21.4 Slide 2 Index Fossils Slide 3 Key Beds Definition: Rock or sediment layers that can be traced back to a very specific event…

Slide 1Index Fossils Slide 2 What are Fossils? Preserved remains or traces of living things. They help show how the Earth has changed over time. They are clues to what the…

Slide 1Chapter 4 Sedimentary Structures Slide 2 Bed: Tabular or lenticular layers of sedimentary rock that have lithologic, textural, or structural unity that clearly distinguishes…

Slide 1How do you know how old it is? Slide 2 Slide 3 Dating in Geology 1) Relative dating –a) Superposition –b) Correlation 2) Numerical (absolute) dating –radiometrics…

Slide 1 17-1 The Fossil Record Slide 2 A fossil is defined as any evidence of life that existed long ago. A fossil can be a plant, an animal, a footprint, an egg, a carbon…