diff --git a/abiogenesis.md b/abiogenesis.md
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+# Abiogenesis
+
+- Life had to have some way to originate from non-living materials
+  1. The abiotic (nonliving) synthesis of small organic molecules, such as
+  amino acids and nitrogenous bases
+  2. The joining of these small molecules into macromolecules, such as proteins
+  and nucleic acids
+  3. The packaging of these molecules into protocells, droplets with membranes
+  that maintained an internal chemistry different from that of their
+  surroundings
+  4. The origin of self-replicating molecules ([[autocatalytic set]]) that
+  eventually made inheritance possible
+- [[RNA World]]: It's proposed that RNA was the first self-replicating molecule
+
+[//begin]: # "Autogenerated link references for markdown compatibility"
+[autocatalytic set]: autocatalytic-set "Autocatalytic Set"
+[RNA World]: rna-world "RNA World"
+[//end]: # "Autogenerated link references"
diff --git a/archaean.md b/archaean.md
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+# Archaean
+
diff --git a/autocatalytic-set.md b/autocatalytic-set.md
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+# Autocatalytic Set
+
diff --git a/cenozoic.md b/cenozoic.md
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+# Cenozoic
+
diff --git a/ediacaran.md b/ediacaran.md
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+# Ediacaran
+
diff --git a/geologic-timeline.md b/geologic-timeline.md
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+# Geologic Timeline
+
+- [[Hadean]]: 4.571 BYA to 4.0 BYA
+  - Named due to hellish conditions
+- [[Archaean]]: 4.0 BYA to 2.5 BYA
+  - Reasonably condusive to life
+  - Pretty certain that cellular life originated here
+  - 3.48 BYA: First cellular life, [[Stromatolites]]
+  - 3 BYA: Oxygenic photosynthesis defines the end of the Archaean
+- [[Proterozoic]]: 2.5 BYA to 541 MYA
+  - 2.8 BYA to 1.9 BYA: Banded Iron Formations imply periods of high
+  oxygenation
+  - CH₄ (Methane) + 2O₂ → CO₂ + 2H₂O: Methane concentration decreased, while
+  Oxygen and CO₂ increased
+  - [[Huronian Glaciation]]
+  - [[Ediacaran]]
+- [[Phanerozoic]]: 541 MYA to Present
+  - Started with a mass-extinction event
+  - Divided into [[Paleozoic]], [[Mesozoic]], and [[Cenozoic]]
+
+[//begin]: # "Autogenerated link references for markdown compatibility"
+[Hadean]: hadean "Hadean"
+[Archaean]: archaean "Archaean"
+[Stromatolites]: stromatolites "Stromatolites"
+[Proterozoic]: proterozoic "Proterozoic"
+[Huronian Glaciation]: huronian-glaciation "Huronian Glaciation"
+[Ediacaran]: ediacaran "Ediacaran"
+[Phanerozoic]: phanerozoic "Phanerozoic"
+[Paleozoic]: paleozoic "Paleozoic"
+[Mesozoic]: mesozoic "Mesozoic"
+[Cenozoic]: cenozoic "Cenozoic"
+[//end]: # "Autogenerated link references"
diff --git a/hadean.md b/hadean.md
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+# Hadean
+
diff --git a/huronian-glaciation.md b/huronian-glaciation.md
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+# Huronian Glaciation
+
diff --git a/mesozoic.md b/mesozoic.md
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+# Mesozoic
+
diff --git a/paleozoic.md b/paleozoic.md
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+# Paleozoic
+
diff --git a/phanerozoic.md b/phanerozoic.md
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+++ b/phanerozoic.md
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+# Phanerozoic
+
diff --git a/proterozoic.md b/proterozoic.md
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+# Proterozoic
+
diff --git a/rna-world.md b/rna-world.md
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+# RNA World
+
diff --git a/stromatolites.md b/stromatolites.md
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+# Stromatolites
+