1.a) Of the following events in Painted Canyon, which one is the youngest? a) Er
ID: 283121 • Letter: 1
Question
1.a) Of the following events in Painted Canyon, which one is the youngest?
a) Eruption of lava flows to form basalt
b) Erosion to form the canyon
c) Faulting that offsets the units
d) Pyroclastic eruption that formed tuff
1.b) Which of the following events did NOT occur between formation of the lowest metamorphic rocks and deposition of the flat-lying sedimentary layers?
a) erosion of the metamorphic rocks
b) formation of the granite
c) uplift of the metamorphic rocks
d) formation of light-colored, very coarsely crystalline dikes of pegmatite that cut the metamorphic ro
1.c) Which of the following is the youngest sediment deposit in Painted Canyon?
a) limestone
b) stream deposits in the bottom of the canyon
c) conglomerate and breccia
d) sandstone and mudstone
1.d) Of the following events in Painted Canyon, which one is the oldest?
Intrusion of magma to form the dark dike
b) Intrusion of magma to form granite
c) Offset of units along a fault
d) Metamorphism to form the banded metamorphic rocks at the bottom of the canyon
a) Eruption of lava flows to form basalt
b) Erosion to form the canyon
c) Faulting that offsets the units
d) Pyroclastic eruption that formed tuff
Explanation / Answer
Answer:1 a
As can seen in the image, the youngest event is should be the erosion (option B), because all the option signifies before erosion phenomenon.
Answer : 1 b
Option B, because the granite formation cut both the formations of metamorphic as well as sedimentary rocks.
Answer: 1c
Option B, because the stream deposit came into existence after all the rest of options.
Answer: 1d
Option D, because it represents the oldest event as all the events occured after this.
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