10 Jun what is the order of age of layering for placemark
Question
Worksheet J. 1 (b) According to the principle of superposition,
what is the order of age of layering for placemarks Problem 1b-i (pink), -ii (dark), and -iii (variegated) from oldest to youngest?
Select one:
a. 1b-i, 1b-ii, 1b-iii
b. 1b-iii, 1b-ii, 1b-i
c. 1b-ii, 1b-iii, 1b-i
d. 1b-i, 1b-iii, 1b-ii
Worksheet J. 1 (c) According to the principle of cross-cutting relationships, which layer is younger: place mark Problem 1c-i (pink) or 1c-ii (tan)? Hint: trace the pink layer to the left and see what happens
Select one:
a. 1c-i
b. 1c-ii
Worksheet J. 1 (d) The surface dividing the units in Problem 1c is called the “Great Unconformity” because it separates older layered Precambrian units from the younger sedimentary Cambrian unit with up to a 1 billion year gap in the rock record due to erosion. What type of unconformity is it at this location?
Select one:
a. nonconformity
b. disconformity
c. angular unconformity
Worksheet J. 1 (e) Check and double-click placemark Problem 1e to fly west to another exposure of the Great Unconformity. Here metamorphic rock and an igneous dyke are truncated and overlain by the same tan Cambrian sedimentary unit. Which is older: the dyke or the tan rock layer?
PLEASE NOTE THE DYKE IS WHITE IN COLOUR
Select one:
a. dyke
b. tan Cambrian sedimentary rock layer
Worksheet J. 1 (f) What type of unconformity is the Great Unconformity at this location?
Select one:
a. nonconformity
b. disconformity
Worksheet J. 1 (g) According to the principle of inclusions, which rock unit should have inclusions of the other?
Select one:
a. the dyke & metamorphic rock should have inclusions of the tan Cambrian rock layer
b. the tan Cambrian sedimentary rock layer should have inclusions of the dyke & metamorphic
rock
Worksheet J. 1 (h) The placemark labeled Problem 1h points to another unconformity between the Early Mississippian Redwall Limestone (below; steep cliff) and the Early Pennsylvanian Supai Group (above). The unconformity represents a hiatus of about 25 million years. What type of unconformity is this? Hint: You know that both units are sedimentary. From the view you have, determine if the layers above and below the unconformity are parallel.
Select one:
a. nonconformity
b. disconformity
c. angular unconformity
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