Stratigraphic Cycles: What Are They?
First published: 2024
Brief summary
Accessible overview explaining that stratigraphic cycles occur at scales from millimetres to hundreds of metres thick, driven by sea-level, sediment supply, and tectonic controls, with periodicity often difficult to measure precisely.
Article
Stratigraphic Cycles: What Are They? is a general/educational published by Geological Digressions in 2024. It presents an accessible overview explaining that stratigraphic cycles occur at scales from millimetres to hundreds of metres thick, driven by sea-level, sediment supply, and tectonic controls, with periodicity often difficult to measure precisely.
General overview, notes periodicities are hard to measure especially below biostratigraphic/radiometric resolution. It also considers example of 5 shale-sandstone cycles over ~35m outcrop. This gives the cycle claim a specific numerical and evidential setting rather than presenting periodicity only as a visual impression.
The article reports the following result: All these cycles have periodicities, although measuring them continues to be a problem for stratigraphers, particularly those of durations less than the resolution of biostratigraphic or radiometric measures of age. The interpretation is strongest when it survives dating uncertainty, preservation bias, alternative event selections and correction for multiple statistical tests.
For cycles researchers, the article brings together stratigraphic cycles, sequence stratigraphy, sea-level change, sediment supply. It is relevant to debates over whether recurring patterns in the geological record reflect astronomical forcing, internal Earth processes, preservation bias or dating uncertainty.
Because this is a general/educational, it is best used as an accessible introduction or perspective rather than as conclusive evidence. Forum discussion should follow its references back to the primary data and original research wherever possible.
Source details and credits
- Source / publisher: Geological Digressions
- Source type: General/educational
- URL type: WWW
- Credits: Geological Digressions
- URL: https://www.geological-digressions.com/stratigraphic-cycles-what-are-they/