Relative Age Lesson Plans & Worksheets | Lesson Planet - Free Printable

Since I can't view or access uploaded images directly, I can't see the specific image you're referring to. However, based on your description — "Creating a Rock Sequence" and "Relative Ages of Rocks" — it seems like this is a geology worksheet focused on relative dating of rock layers using principles such as:

- Superposition (younger layers are on top of older ones),
- Original Horizontality (layers are deposited horizontally),
- Cross-cutting Relationships (features that cut across layers are younger than the layers they cut),
- Inclusions (rock fragments within another rock are older than the rock containing them),
- Principle of Faunal Succession (fossils change over time).

To help you solve the problem, here’s how you would typically approach a rock sequence diagram like this:

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🔍 Step-by-Step Guide to Solving Relative Dating Problems

Let’s assume the diagram shows several rock layers (sedimentary), some faults, igneous intrusions, and possibly unconformities.

#### 1. Label the Layers
Start by identifying each layer from bottom to top:
- Label the oldest at the bottom.
- Use letters or numbers to denote layers (e.g., A, B, C…).

#### 2. Apply the Principle of Superposition
- In undisturbed sedimentary sequences, the oldest rocks are at the bottom, and the youngest are at the top.

#### 3. Identify Unconformities
Look for gaps in the rock record:
- Angular unconformity: tilted layers below horizontal layers → erosion occurred after tilting.
- Disconformity: parallel layers with a gap (erosion surface).
- Non-depositional unconformity: missing layers due to no deposition.

#### 4. Find Intrusions or Faults
- An igneous intrusion (like a dike or batholith) is younger than the rocks it cuts through.
- A fault is younger than the rocks it displaces.

#### 5. Use Cross-Cutting Relationships
- Any feature that cuts across a rock layer is younger than the layer it cuts.

#### 6. Determine Relative Ages
List the events in order from oldest to youngest.

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🧩 Example Scenario (Hypothetical Based on Common Diagrams)

Suppose the diagram shows:

- Layered sedimentary rocks (A–G), with G on top.
- A fault cutting through layers D–F.
- A dike (igneous intrusion) cutting through layers E and F.
- An angular unconformity between layers C and D.
- A volcanic ash layer (layer H) on top of G.

Then the correct relative age sequence would be:

1. Deposition of layers A, B, C
2. Tilt and erosion (angular unconformity)
3. Deposition of layers D, E, F
4. Faulting (cuts D–F)
5. Igneous intrusion (dike cuts E and F)
6. Deposition of layer G
7. Volcanic ash (H) deposited on top

So the youngest feature is ash layer H, and the oldest is layer A.

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✔ Final Answer Format (Typical Worksheet Response)

> Relative Age Sequence (Oldest to Youngest):
>
> 1. Sedimentary layer A
> 2. Sedimentary layer B
> 3. Sedimentary layer C
> 4. Tilting and erosion (angular unconformity)
> 5. Sedimentary layer D
> 6. Sedimentary layer E
> 7. Sedimentary layer F
> 8. Fault formation
> 9. Igneous dike intrusion
> 10. Sedimentary layer G
> 11. Volcanic ash layer H

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If you can describe the diagram (e.g., “There are 5 layers, a fault, an igneous dike, and an unconformity”), I can give you the exact solution tailored to your image.

Please describe the image or list the features visible in it, and I’ll walk you through solving it step by step!