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☆☆☆☆☆Younger than the rock it intrudes into
Index Fossils
The constituent time segments are epochs and periods, which are further divided into ages.
fault-block mountains
Fossil organisms succeed one another in a definite and determinable order, and therefore any time period can be recognized by its fossil content.
-organisms evolve, and organisms become extinct.
Proposed by William Smith late 1700's and early 1800's
Are constant
a nonconformity
1.25 billion years: 25/50 or half the original atoms have disintegrated in 1.25 billion years, and that is the definition of half life.
Uniformitarianism
Compressional Stresses
The folding or tilting of rocks, followed by renewed deposition, has to occur to create an angular unconformity.
heated during metamorphism
A 60,000 year old mammoth bone.
It enlarges continental landmasses and forms mountains along the edges of continents.
The boundaries of history of eras are marked by great worldwide changes in continental coastline
thicker
