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- https://geo.libretexts.org/Courses/Lumen_Learning/Earth_Science_(Lumen)/10%3A_Geologic_History/10.06%3A_Geologic_Time_ScaleThis 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.
- https://geo.libretexts.org/Courses/Lumen_Learning/Earth_Science_(Lumen)/10%3A_Geologic_History/10.01%3A_Relative_Ages_of_RocksThis page details the evolution of geological thought from Nicholas Steno's 1666 work on fossils and rock formation principles, which challenged existing beliefs, to James Hutton's introduction of uni...This page details the evolution of geological thought from Nicholas Steno's 1666 work on fossils and rock formation principles, which challenged existing beliefs, to James Hutton's introduction of uniformitarianism and the importance of geological time.
- https://geo.libretexts.org/Sandboxes/ajones124_at_sierracollege.edu/Geology_of_California_(DRAFT)/03%3A_Plate_TectonicsThe page introduces the theory of plate tectonics, explaining how it accounts for the Earth's geological features and changes over time. It highlights the difficulties in the theory's acceptance due t...The page introduces the theory of plate tectonics, explaining how it accounts for the Earth's geological features and changes over time. It highlights the difficulties in the theory's acceptance due to lack of a driving mechanism for continental movement and geographic biases among early 20th-century geologists. The text also outlines learning objectives related to understanding different plate boundaries, the driving forces behind plate movements, and California's plate boundaries.
- https://geo.libretexts.org/Courses/Lumen_Learning/Earth_Science_(Lumen)/10%3A_Geologic_HistoryThis page discusses six important geological topics: determining relative and absolute ages of rocks, fossils, Earth's life history, early Earth conditions, and the geologic time scale. It highlights ...This page discusses six important geological topics: determining relative and absolute ages of rocks, fossils, Earth's life history, early Earth conditions, and the geologic time scale. It highlights how scientists assess rock and fossil ages, comprehend life's evolution, and map Earth's geological history.
- https://geo.libretexts.org/Courses/Lumen_Learning/Earth_Science_(Lumen)/10%3A_Geologic_History/10.03%3A_FossilsThis page discusses the historical fascination with fossils, which inspired myths like dragons. Fossilization, a rare process influenced by decay and environment, includes methods like permineralizati...This page discusses the historical fascination with fossils, which inspired myths like dragons. Fossilization, a rare process influenced by decay and environment, includes methods like permineralization and molds. Key fossil sites offer insights into ancient organisms and evolutionary changes. Fossils help trace Earth's history, indicate past climates and environments, and document significant events, such as mass extinctions.
- https://geo.libretexts.org/Sandboxes/ajones124_at_sierracollege.edu/Geology_of_California_(DRAFT)/11%3A_Coast_Ranges/11.06%3A_Quaternary_EventsThis page discusses the Quaternary period, highlighting the transition from the Pleistocene to the Holocene and significant human developments post-Ice Age. It mentions the transformation of San Franc...This page discusses the Quaternary period, highlighting the transition from the Pleistocene to the Holocene and significant human developments post-Ice Age. It mentions the transformation of San Francisco Bay and early human interactions with extinct species. Additionally, it reflects on the importance of curiosity and inquiry in life, emphasizing that the pursuit of knowledge adds excitement and depth to human experience.
- https://geo.libretexts.org/Courses/Lumen_Learning/Earth_Science_(Lumen)/10%3A_Geologic_History/10.04%3A_History_of_Earths_Life_FormsThis 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.
