Edible Geology
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Transcript of Edible Geology
Edible Geology-directions
Limestone• First layer is limestone• Formed when land was under
water
Sandstone• Formed by sand deposited by a
river
• AG EN T ER O S IO N• Fossils are often found here
COAL• Formed when area was part of a
large swamp• Very important to fossil hunters• Where you find coal, you are
likely to find fossils nearby• Dark coal beds are easy to spot
COAL
Sandstone - 2
Siltstone• Made of grains that are smaller
than sand, but larger than clay
Final Formation• Which layer is the “oldest”?• Where are the fossils?• Will they ever be found?
• Rock layers can stretch, bend, and even break
Uplifting• Pressures inside the earth form
mountain ranges• Can twist rock layers
• Slide a knife under the center of your gelatin square and lift.
• Bend…and break
Overthrust• Rock layers (strata) can get
mixed up another way
• Gently push in from opposite sides of the square so the center rises up.
• Mixed up strata makes it hard to determine whereyoungest strata is
Faulting• Earth’s surface has big cracks
called faults• Sometimes land around a fault
line is raised above another
• Don’t waste yourjello…just look here:
Finally…Erosion• Rocks are constantly being worn
away by wind and rain, uncovering fossils
• Ahhhh!