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The Great Unconformity

The Great Unconformity mind map
December 2023 News
Adrian Tasistro-Hart's Research
Flood Theory
Sauk Transgression
Coastal and Marine Sediments
Found in Continental Interiors
Continental Flooding
Occurred Five Times
Past 510 Million Years
First Post-Great Unconformity
Active Subduction
At Continental Margins
Account for Flooding Events
Published Results
In Proceedings of the National Academy of Sciences
C. Brenhin Keller's Research
Glacial Activity Theory
Continental Ice Sheets
Responsible for Lost Rock Formations
Study Published in Proceedings of the National Academy of Sciences
Glaciation and Tectonics
Contributed to Rock Loss
Research by Nanjing Institute
Late Ediacaran to Early Cambrian Strata
On Southern North China Craton
Global Sea-Level Fall
Led to Formation
Ediacaran-Cambrian Unconformity
Rebecca Flowers' Research
Multiple Great Unconformities
Characterization
Based on Modeling
Thermochronologic Results
From Grand Canyon
Different Thermal Histories
What
Geological Phenomenon
Missing Geological Time
Up to a Billion Years
Separation of Rocks
Full of Fossils
Largely Fossil-Free Rocks
When
Cryogenian Period
720 to 635 Million Years Ago
Ediacaran–Cambrian Transitional Period
Snowball Earth
Rock Carved Away
Up to 3 Miles Deep
Why
Ice Age Glacial Activity
Plate Tectonics
Assembly and Breakup of Rodinia
Subglacial Erosion
Glaciers Scouring Continents
Where
North America
North China Craton
Grand Canyon
East and West Sections
Central Canada
Tectonically Quiescent
Who
Adrian Tasistro-Hart
Sedimentary Geologist
Doctoral Student, Department of Earth Sciences
C. Brenhin Keller
Assistant Professor of Earth Sciences
Kalin McDannell
Postdoctoral Researcher in Earth Sciences
Rebecca Flowers
Thermochronologist, University of Colorado Boulder
Sun Yunpeng
Researcher, Nanjing Institute
How
Continental Ice Sheets Erosion
Subduction at Continental Margins
Global Geodynamics
Changing Mantle Dynamics
Oceanic Crust Dynamics
Buoyant and Expanding
Counterbalanced by Subsidence
Significance
Explains Geological Gaps
Insights into Earth's History
Emergence of Complex Organisms
Cambrian Explosion
Evolution of Multicellular Life
Challenges
Incomplete Geological Record
Due to Erosion
Diverse Theories
Different Explanations for Same Phenomenon
Way Forward
Further Testing
Against Geologic Record
Global Pattern Analysis
To Strengthen Theories
Compiling Data
Into Large Database for Gondwana

The Great Unconformity is a significant geological phenomenon characterized by a massive gap in the Earth’s geological record, spanning up to a billion years. It separates fossil-rich rocks from older, largely fossil-free rocks. Recent studies in 2023, including those by Adrian Tasistro-Hart and C. Brenhin Keller, have proposed different theories to explain this enigma. Tasistro-Hart suggests that continental flooding caused by active subduction at continental margins, particularly during the Sauk Transgression, contributed to the Great Unconformity. Keller’s research points to the role of glaciation during the Cryogenian period. Other researchers, like Rebecca Flowers, argue that there could be multiple Great Unconformities caused by a combination of factors, including glaciation and tectonics. These studies not only attempt to explain the geological gaps but also explore the implications for Earth’s history and the evolution of complex life.

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