Geological Time

Question 1

John Wesley Powell

Answer 1

realised the evidence of an ancient earth is concealed in its rocks, primarily the sedimentary

Question 2

Relative dating

Answer 2

placing rocks in a sequence of formation

Question 3

Numerical Dating

Answer 3

years that have passed since an event occurred.

Question 4

Steno’s Law of Superposition

Answer 4

in an undeformed sequence of sedimentary rock, each bed is older than the one above it.

Question 5

Steno’s Principle of Original Horizontality

Answer 5

sediments are deposited horizontally, tilted or folded layers used to be flat.

Question 6

Steno’s Principle of Cross-Cutting Relationships

Answer 6

if a geological feature cuts across another, the one that cuts across must be younger than the one it cuts.

Question 7

Uncomformities

Answer 7

interruption of the deposition of sediment. significant geological events in history. ex. ice age.

Question 8

Angular Uncomformity

Answer 8

tilted or folded sedimentary rock that are overlain by more flatlying younger strata.

Question 9

noncomformity

Answer 9

breaks seperate older metamorphic and igneous rock from younger sedimentary strata.