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Finding the Age of Rock Layers

Finding the Age of Rock Layers. The FRAME Routine. is about…. Main idea. Main idea. Main idea. Essential details. Essential details. Essential details. So What? (What’s important to understand about this?).

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Finding the Age of Rock Layers

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  1. Finding the Age of Rock Layers The FRAME Routine is about… Main idea Main idea Main idea Essential details Essential details Essential details So What? (What’s important to understand about this?) …using the Law of Superposition, tectonic changes and unconformities to identify the order of layers in the geologic column. Law of Superposition Unconformities Tectonic Changes Older layers lie above younger layers Folding – causes an “arc” in the layers Cause a disruption in the geologic column Every new layer lays on top Missing layers could be due to nondeposition or erosion Slanting causes the layers to tip upward Some layers may be larger in one area than another Crosscutting is always the youngest layer Fossils in the layer reflect the age of the layer . While the younger layers of rock are always laid on top, sometimes weathering and erosion and tectonic changes cause the layers to shift their position relative to one another. Key

  2. Finding the Age of Rock Layers The FRAME Routine is about… Main idea Main idea Main idea Essential details Essential details Essential details So What? (What’s important to understand about this?) …using the Law of Superposition, tectonic changes and unconformities to identify the order of layers in the geologic column. . Mod Level 1

  3. Finding the Age of Rock Layers The FRAME Routine is about… Main idea Main idea Main idea Essential details Essential details Essential details So What? (What’s important to understand about this?) …using the ________________________, _____________________, and ___________________ to identify the order of layers in the geologic column. ____________________ _____________ Tectonic _________ Folding - Slanting - Crosscutting - . Mod Level 2

  4. Finding the Age of Rock Layers The FRAME Routine is about… Main idea Main idea Main idea Essential details Essential details Essential details So What? (What’s important to understand about this?) …using the Law of _____________, ___________________ changes and _____________________ to identify the order of layers in the geologic column. Law of ______________ _________________ ________ Changes Older layers lie _________ younger layers _________ – causes an “arc” in the layers Cause a disruption in the _________ column Every new layer lays _____ _______ Missing layers could be due to ____________ or erosion __________ causes the layers to tip upward Some layers may be _______ in one area than another ____________ is always the youngest layer _________ in the layer reflect the age of the layer . How do the relative dating techniques work together? Mod Level 3

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