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Sedimentary layers or lava flows extend sideways in all directions until they thin out or reach a barrier.
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
In some rock formations, layers or parts of layers may be missing. This is often due to erosion. Erosion by water or wind removes sediment from exposed surfaces. Erosion often leaves a new flat surface with some of the original material missing
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
Relative Dating can tell you
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
Relative Dating uses
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
Erosion
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
The oldest rocks are usually found on the
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
Sediments are originally deposited in horizontal layers.
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
Any feature that cuts across rock layers is younger than the layers
Bottom of a rock formation
Original Horizontality
if the rock is older or younger than another rock by comparison
Ages of two objects comparatively to see which is older
Cross-Cutting Relationship
wears away rock layers
Lateral Continuity
Uncomformities
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