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Fossil are the preserved remains or traces of living things. They form when living things die and are buried by sediment. They are usually found.

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Presentation on theme: "Fossil are the preserved remains or traces of living things. They form when living things die and are buried by sediment. They are usually found."— Presentation transcript:

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6 Fossil are the preserved remains or traces of living things. They form when living things die and are buried by sediment. They are usually found in _______________ rock

7 1. Petrified fossils: formed by replacement. Water carrying minerals replace all or part of an organism. 2. Molds and Casts: Mold: hollow area in sediment in the shape of an organism Cast: water carrying minerals seeps into the mold and deposits the minerals

8 3. Carbon films: As a buried plant or animal decays, it releases gases containing carbon. - the gases escape, leaving the carbon behind preserving the plant or animals image.

9 Trace fossils: evidence that an organism was previously there Example: footprints, trails, burrows

10 1. The fossil record provides evidence about the history of life on Earth. The fossil record can tell us about past environments and climate change on Earth. The fossil record can tell us about mass extinctions

11 2. The fossil record shows how organisms have changed over time. (evolution) It shows how organisms have gone from simple to more complex organisms

12 A. fault B. uplift C. fold D. I don’t know

13 A. normal B. reverse C. strike-slip D. I don’t know

14 A. tension B. compression C. shear D. I don’t know

15 Define the following: Relative age Absolute age Law of superposition Extrusions Intrusions Unconformity Index fossil

16 Relative age: the age a rock compared the age of surrounding rocks Absolute age: the age of a rock since it was formed Law of Superposition: in horizontal rock layers, the oldest is always on the bottom.

17 - extrusions: lava that hardens on the surface - always younger than the layer below it - intrusions: magma that hardens below ground - dike: always younger than the rock layer it cuts across - unconformity: a gap in the geologic record - missing layer(s) usually due to erosion

18 -index fossil: a fossil that can be used to determine the relative age of rock layers - fossil must be widely distributed and should have existed for a short period of time. Fossils record shows how life has become more complex. Example : trilobites, ammonites

19 A. rock layers are deposited horizontally. B. rock layers on the bottom are the oldest. C. rock layers on the top are the oldest. D. I don’t know

20 A. when extinct organisms lived B. what extinct organisms behaved like C. the year they died D. I don’t know


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