This is the assignment please help.
In this laboratory experiment, you will write a narrative history of a rock section found in the Grand Canyon. You will describe and explain the events starting with the Vishnu Schist forming and ending with the unconformity above the Redwall Limestone in the Mississippian. Your description should include environmental changes.
Example:
oSea level lowered, and the Esplanade Sandstone was deposited in a beach environment.
oErosion, and the sea level rose.
oHermit Shale deposited in a deeper sea.
oSea level drops, returning the area to a beach environment where the Coconino Sandstone was deposited.
1.Interpret the bottom half of the cross section below. Start with the Vishnu Schist and end with the Redwall Limestone.
Scoring:
(8 points)
Score
Correct order:
(8 points)
Score
Proper environmental changes:
(4 points)
Score
Attention to detail and completeness:
Answer:
(5 points)
Score
2.There is one of each type of unconformity in this diagram. Name at least one of each of them by indicating the layers that they are between.
Nonconformity:
Answer:
Angular unconformity:
Answer:
Disconformity:
Answer:
Your Score___ of 25
Symbol
NameEnvironment
SandstoneBeach or nearshore environment
LimestoneForms in warm shallow seas
ShaleDeep sea
Igneous Rock (Granite)Formed when rocks melt and then recrystalize
Metamorphic Rock
(Schist)Formed when rocks are severely deformed without melting; in this cross section, the Vishnu Schist represents the original surface in the area
Igneous intrusion Magma melting and rising from deeper levels
Hint: How can you tell the difference between an intrusion and rocks melting in place? Rocks melting in place usually appear as a large mass, whereas intrusions seem to have risen up from a source.
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