Population III Stars: Heavier Elements
13.6 Billion Years Ago
Verified. Empirically supported and rationally deduced.
Population II Stars: Heavy Element Synthesis
13.59 Billion Years Ago
Verified. Empirically supported and rationally deduced.
Interstellar Clouds: Organic Molecules
10 Billion Years Ago
Verified: 10 to 7 Billion Years Ago
Population I Stars: Like our Sun
10 Billion Years Ago
Verified. Empirically supported and rationally deduced.
First Atmosphere: Hydrogen & Helium
4.48 Billion Years Ago
4.49 to 4.6 Billion Years Ago
Inorganic Precursors to Organic Molecules
4.45 Billion Years Ago
Spedulative guess: 4.2 to 4.4 Billion Years Ago
Second Atmosphere: Carbon Dioxide & Nitrogen
4.3 Billion Years Ago
4.5 to 4 Billion Years Ago
First Oceans: Fresh Water
4.2 Billion Years Ago
4 to 4.4 Billion Years Ago
Chemical Evolution of Organic Molecules
4.1 Billion Years Ago
Spedulative guess: 4 to 4.4 Billion Years Ago
Formation of Prebiotic Microenvironments
4 Billion Years Ago
Spedulative guess: 3.9 to 4.1 Billion Years Ago
First Life: Self-Replicating Molecules
3.95 Billion Years Ago
Spedulative guess: 3.85 to 4.15 Billion Years Ago
LUCA – Last Universal Common Ancestor
3.6 Billion BCE
Spedulative guess: 3.5 to 3.8 Billion Years Ago
Second Oceans: From Fresh to Salty
3.5 Billion Years Ago
3.5 to 2.5 Billion Years Ago
Oldest Known Fossil-Microorganisms
3.42 Billion BCE
3.42 to 3.7 Billion BCE
Cyanobacteria: Sun Energy as Food!
2.7 Billion Years Ago
2.7 to 2.6 BYA
The First True Eukaryotes
2.4 Billion Years Ago (+/- 300 million years)
Third Atmosphere: Oxygen Atmosphere
2.4 Billion Years Ago
2.4 BYA to about 540 MYA
Animals, Plants, and Fungi Split
Touch Emerges: Proto-Sensing.
First Multicellular Animals
640 Million Years Ago
640 to 600 Million Years Ago
Presentient Animals Emerge: The Ediacaran Prelude
635-600 Million Years Ago
Proto-brain; Pre-brain memory; Presentient.
Chemorecption: Taste and Smell Emerge
First True Animals – Comb Jellyfish
560 Million BCE
560 to 550 Million Years Ago
Vision Emerges: The Pre-fish Chordates
540 Mya
Vision Emerges; Proto-Simple Brains; Pre-vertebrate Cord.