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Throughout the history of life, different organisms have appeared, flourished and become extinct.Many of these organisms have left their remains as fossils in sedimentary rocks.Different species of ammonites lived at different times within the Mesozoic, so identifying a fossil species can help narrow down when a rock was formed.Correlation can involve matching an undated rock with a dated one at another location.(Hint- For help numbering the boxes, refer back to the last three paragraphs.) Write the term that describes the event that happened in the space below the drawing.This exercise you will practice using relative dating principles of Superposition, Original Horizontality, Cross-cutting Relationships, and unconformities.Place the events from the cross-section above in order by letter.Oldest: ___ Youngest Which rock letters are sedimentary? ____ Why ____ Place the events from the cross-section above in order by letter.

Where are the oldest pictures, by year, going to be in your stack? Often igneous intrusions will cut across layers of rock.Correlation with them has helped geologists date many New Zealand rocks, including those containing dinosaurs. If you did it like many people, you based your sentences on what you know normally happens when you make a lunch.The USGS has a good introduction of Relative Dating to have you practice putting historical events in the correct order.Rock layers represent "historical events," so a rock layer is like a page in the book of Earth's geologic history. There are five different pictures of one rock sequence throughout time.

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