Blacktail Canyon in the
Grand Canyon questions and
answers
You just listened to Dr. Karl Karlstrom describe some features of
Blacktail Canyon.
For each unit, select the reason why Dr. Karlstrom states these rock
units are important. - answer The 'upper rock unit' represents the
time of the explosion of life on Earth during the Cambrian period.
The 'lower rock unit' contains the oldest rock found in the southwest
United States
Upper;lower - answer Sedimentary, metamorphic
Q3 - answer The Elves Chasm Gneiss metamorphic rock is older than
the sedimentary Tapeats Sandstone rock.
Q4 - answer Principle of superposition
Q5 - answer Yellow
Q6 - answer Horizontal
Select the type of sedimentary rock that is comprised of broken
fragments of rocks that might be coarse and anglular in shape. -
answer Clastic