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Ch.6Rock&Fossils
Fossil Record and Geologic Time
| Question | Answer |
|---|---|
| What are trace fossils? | naturally preserved evidence of organism activity |
| Describe the disturbing force of tilting. | slanting of rock layers |
| What would scientists use to get the exact date of one of Earth's oldest rocks? | Absolute date can be found by using Uranium-Lead method |
| Type of science that includes Uniformitarianism and Catasrophism. | Modern Geology |
| The Geologic Time Scale is used for what? | Divides Earth's history into manageable parts. |
| What is an index fossil? | Fossils that lived for a relatively short geologic time period. |
| What can an index fossil tell a geologist? | A relative date of surrounding rock layers. |
| What does Paleontology mean? | Study of past life. |
| What occurs during Radioactive Decay? | Unstable radioactive isotopes break down into stable isotopes of other elements. |
| If Marine fossils (fish like creatures) are found in North Dakota, what does that tell you about North Dakota? | North Dakota had great seas or lakes at some time in history. |
| Unconformities are primarily caused by what? | Erosion of sediment. |
| Term that describes the idea that geologic change happens rapidly. | Catasrophism |
| In order to calculate the absolute age of a rock a scientist must know what? | The rate of decay for a radioactive element within the rock. |
| What is the Law of Superposition? | Idea that younger rock will lie over older rock unless disturbed. |
| In the Geologic Time Scale, what is the oldest segment called? | Eon |
| In the Geologic Time Scale, what is the youngest segment called? | Epoch |
| Term that describes the idea that geologic time processes are the same now as in the past and occur slowly over time. | Uniformitarianism |
| The extinction of the dinosaurs can be linked to what eventual occurrence. | Climate Change |
| Which process used to date rock occurs at a steady rate? | Radiometric Decay |
| The process in which rock is dated by comparing it with other rock layers is called? | Relative Dating |
| Paleontologists learn about what as they study fossils? | How life has changed over time. |
| The Mesozoic Era ended with catastrophic change ending the age of dinosaurs, but what Era experienced the largest mass extinction? | Paleozoic |
| How much of the Geologic Time Scale do Geologists study? | 4.6 Billion years or all of it |
| When a Trilobite is buried by ocean sediment it would leave a cavity called what? | Mold |
| The best way to describe the geologic column, which pieces together the rock layers of Earth would be to call it what? | Ideal |
| If the mold of a Trilobite is filled with sediment and hardens it is called a what? | Cast |
| What type of Unconformity has sediment lying over igneous (bedrock)? | Nonconformity |
| What type of Unconformity has a missing sediment layer? | Disconformity |
| What type of Unconformity has sediment lying over tilted layers? | Angular Unconformity |
| List the four kinds of 'Disturbing Forces.' | Tilting, Folding, Fault & Intrusion |
| The unstable radioactive material is called the what? | Parent |
| The stable radioactive material is called the what? | Daughter |
| What is a Half-life when discussing Radiometric Dating? | The time it takes for 1/2 of a radioactive element to decay. |
| A break in the geologic record is a? | Unconformity |
| What can the fossilized tracks of animals tell paleontologists? | hight of dinosaur, speed of step, movement in herds |
Created by:
cslavens
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