PLEASE HELP
By applying the various principles, draw a cross section of an area in which the following sequences of events occurred. The relative time relationship for all events should be clear to you from your single cross section that shows what the geology looks like at present.
a. Metamorphism took place during the Archean. During later Precambrian time, uplift and erosion reduced the area to a plane.
b. Three layers of marine sedimentary rock (limestone) were deposited on the plane during Ordovician through Devonian time.
c. Although sedimentation may have taken place during the Mississippian through Permian, there are presently no sedimentary rocks of that age in the area.
d. A vertical dike intruded all rocks that existed here during the Permian.
e. A layer of sandstone was deposited during the Triassic.
f. All of the rocks were tilted 45 during the Cretaceous. This was followed by erosion to a planar surface.
g. The area dropped below sea level, and two layers of Tertiary sedimentary rock were deposited on the erosion surface.
h. Uplift and erosion during the Quaternary resulted in a slightly hilly surface.
i. Following erosion, a vertical dike fed a small volcano
All of the rocks were tilted 45 degrees during the early Cretaceous. This was followed by erosion to a planar surface.
To draw a cross-section that represents the sequence of events described, follow these step-by-step instructions:
Step 1: Start with a horizontal plane representing the Archean time period when metamorphism took place.
Step 2: On top of the Archean layer, draw three layers of marine sedimentary rock (limestone) to represent the Ordovician through Devonian time period.
Step 3: Above the limestone layers, leave a blank space to represent the absence of sedimentary rocks from the Mississippian through Permian time period.
Step 4: Draw a vertical dike cutting across all the rocks, representing its intrusion during the Permian time period.
Step 5: On top of the existing layers, draw a layer of sandstone to represent its deposition during the Triassic.
Step 6: Tilt the entire section 45 degrees to represent the tilting of rocks during the Cretaceous. Include arrows or annotations to indicate the direction of the tilt.
Step 7: After the tilting event, erode the tilted rocks to a planar surface.
Step 8: Indicate a drop in sea level by drawing a downward line below the eroded surface, indicating the area going below sea level.
Step 9: On top of the sea level drop line, draw two layers of Tertiary sedimentary rock to represent their deposition on the erosion surface.
Step 10: Above the Tertiary layers, draw hilly topography caused by uplift and erosion during the Quaternary period.
Step 11: Finally, draw a vertical dike that fed a small volcano after the Quaternary erosion. This dike should cut through the existing layers.
Ensure that the relative time relationships between the events are clear by arranging the layers and events in the correct chronological order. Label each event or layer with its corresponding time period for clarity.
To draw a cross-section of the area based on the given sequence of events, follow these steps:
1. Start with a horizontal line to represent the original plane of the area before any events occurred.
2. Label the line with the time period of the Archean to indicate that metamorphism took place during this period. You can draw wavy lines or use shadings to represent metamorphic rocks.
3. Use parallel lines or horizontal layers to represent the Ordovician through Devonian sedimentary rocks, specifically limestone, that were deposited on top of the metamorphic rocks during later Precambrian time.
4. Leave a gap or draw a distinct break in the layers to indicate that there are no sedimentary rocks of Mississippian through Permian age in the area. You can label this gap with the time period or simply use "No sedimentary rocks" notation.
5. Draw a vertical dike cutting across all the rocks to represent the intrusion that occurred during the Permian. You can draw a vertical line with diagonal lines cutting through it to symbolize the dike.
6. On top of the existing layers, draw another distinct layer of sandstone to represent the Triassic deposition.
7. Tilt all the layers, including the dike and sandstone layer, at a 45-degree angle to indicate the Cretaceous event. You can draw lines or arrows showing the tilting.
8. After the tilting, indicate erosion that occurred, resulting in a planar surface. You can erase or slightly fade out the tilted layers.
9. Below the planar surface, draw two distinct layers of Tertiary sedimentary rock to represent the deposition during the Tertiary period. You can use parallel lines or small triangles to represent these sediments.
10. Show uplift and erosion during the Quaternary by giving the surface a slightly hilly appearance. You can draw irregular lines or small bumps on top of the planar surface.
11. Finally, indicate the small volcano by drawing a vertical dike feeding into a cone shape on the topmost part of the cross-section.
Remember to label each event with the corresponding time period to make the cross-section clear and easily understandable.