Lesson 3.1 - Relative Age Dating Review

Fill in the Blanks using the words below (you can copy and paste): According to Law of Lateral Continuity sediments are deposited in large continuous sheets in all lateral directions.Fossils are preserved remains of ancient living things.According to Law of Superposition the older rock layer lies at the bottom.Matching rocks and fossils from separate locations is called correlation.If one geologic feature cuts across another feature, the feature that is cutting across is younger.A piece of an older rock that becomes part of a new rock is called a inclusion.Trilobite and ammonite are examples of index fossils.According to Law of Original Horizontality most rock forming materials are deposited in horizontal layers.Relative age determines the age of rocks compared to other rocks.A unconformity shows a gap in time period. Index fossils CAN tell us the numerical (number) age of a rock layer. True False Index Fossils are used to: alphabetize the names of new fossils that are found indicate the age of certain layers of sedimentary rocks determine the social structure of the larger dinosaurs identify present day organisms What type of unconformity is shown above? disconformity nonconformity angular unconformity single unconformity What type of unconformity is shown above? disconformity nonconformity angular unconformity single unconformity If you find the same index fossil in rock layers at three different locations, what can you conclude? that the rock layers at the three locations are all the same age. that the habitats in the three locations were continuous. that the rock at all three locations is the same type. that an individual organism of this type could travel a long way. Sort the following statements as TRUE or FALSE TRUE Ammonite and trilobite are index fossils Index fossils have a short geological life span Relative age is determined by comparing different rocks Inclusions are older than the rock they are found in Law of Superposition is used to determine relative age Index fossils were found in many different geographic locations FALSE All fossils are used to find relative age of rocks Index fossils have a very long geological life span Inclusions are younger than the rock they are found in Law of Superposition is used to determine absolute age