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Earth's History Study Guide - Coggle Diagram
Earth's History Study Guide
Geologists
William Smith
William Smith connected strata in different locations by recognizing similar patterns of fossils
Charles Darwin
The idea that older rock layers are farther from the surface inspired Darwin's work on evolution.
James Hutton
Hutton concluded that strata take thousands of years to form
Nicolaus Steno
Steno proposed 3 laws: the law of superposition, horizontality, and cross-cutting relationships.
Rock Cycle
Types of rocks
Igneous
Created through magma cooling and solidification
Used for absolute dating
Uses years to identify the ages of rocks and fossils (MYA, BYA)
Sedimentary Rock
Fossils usually found in these rocks
Compaction and cementation of sediments
Used for relative dating
Comparison to other fossils and rocks (Not actual age)
Form stratas
Metamorphic
Changed by heat and pressure
Geologic Timescale
Eras
100s of millions of years
Can be compared to as a clock
Periods
10s of millions of years
Epochs
More than 3 million years
a system of chronological dating that classifies geological strata in time
Used by Geologists, Paleontologists and other Earth Scientists.