This page discusses Earth's 4.5 billion-year history through the geologic time scale, which categorizes significant events and organisms into eons, eras, and periods based on fossil evidence. Historic...This page discusses Earth's 4.5 billion-year history through the geologic time scale, which categorizes significant events and organisms into eons, eras, and periods based on fossil evidence. Historical geologists initially used relative dating for rock layer organization but later applied absolute dating techniques, like radioactivity, for precise dating.
This page covers the discovery of Cambrian fossils by Charles Doolittle Walcott, highlighting the evolution and adaptations of species over time. It discusses the fossil record's importance in underst...This page covers the discovery of Cambrian fossils by Charles Doolittle Walcott, highlighting the evolution and adaptations of species over time. It discusses the fossil record's importance in understanding life's development and the role of mass extinctions.
