Exploring the significance of true substrates in a Pennsylvanian fluvio-estuarine tidal flat
dc.contributor.author | Buatois, Luis | |
dc.contributor.author | Mángano, M. Gabriela | |
dc.contributor.author | Maples, Christopher G. | |
dc.date.accessioned | 2025-02-03T20:42:22Z | |
dc.date.available | 2025-02-03T20:42:22Z | |
dc.date.issued | 2025-01-25 | |
dc.description | The published version is found in the Lyell Collection found at: https://doi.org/10.1144/SP556-2024-118 Buatois, Luis A, M. Gabriela Mángano, and Christopher G Maples. (2025). “Exploring the Significance of True Substrates in a Pennsylvanian Fluvio-Estuarine Tidal Flat.” In Bedding Surfaces: True Substrates and Earth’s Historical Archive. The Geological Society of London, 556. https://doi.org/10.1144/SP556-2024-118 | |
dc.description.abstract | The Pennsylvanian Tonganoxie Sandstone of Kansas contains examples of true substrates in tidal rhythmites formed in a tidal flat at the fluvio-estuarine transition of a macrotidal valley. These surfaces are characterized by an impressive preservation of biogenic and physical sedimentary structures, indicative of the coexistence of low-energy tidal currents and freshwater conditions together with brief periods of subaerial exposure. Biogenic activity corresponds to a time of stasis during or immediately after accumulation of ebb-phase clay followed by low tide. Deposition-stasis-deposition (D-S-D) was involved in the formation and preservation of these true substrates, with only a few instances of deposition-stasis-erosiondeposition (D-S-E-D). Crosscutting relationships among biogenic structures and of these with physical sedimentary structures suggest a tidally controlled taphonomic pathway, which indicates that these true substrates represent short-term time-averaged surfaces at the scale of a few hours, rather than snapshots. True substrates preserved in tidal rhythmites are widespread in other late Palaeozoic tide-dominated estuarine deposits of the North American Midcontinent. The likelihood and quality of preservation seem to show spatial and temporal trends at various scales that ultimately reflect a complex interplay of abiotic factors (e.g. sedimentary dynamics) and biotic factors (e.g. secular changes in intensity and depth of bioturbation). | |
dc.description.sponsorship | Financial support was provided by Natural Sciences and Engineering Research Council (NSERC) Discovery Grants 311727–15/20 and 311726–13/422931-20 awarded to Mángano and Buatois, respectively. Mángano acknowledges additional funding by the George J. McLeod Enhancement Chair in Geology. | |
dc.description.version | Peer Reviewed | |
dc.identifier.citation | Buatois, Luis A, M. Gabriela Mángano, and Christopher G Maples. (2025). “Exploring the Significance of True Substrates in a Pennsylvanian Fluvio-Estuarine Tidal Flat.” In Bedding Surfaces: True Substrates and Earth’s Historical Archive. The Geological Society of London, 556. https://doi.org/10.1144/SP556-2024-118 | |
dc.identifier.doi | https://doi.org/10.1144/SP556-2024-118 | |
dc.identifier.uri | https://hdl.handle.net/10388/16538 | |
dc.language.iso | en | |
dc.publisher | Geological Society Special Publications | |
dc.subject | substrates | |
dc.subject | fluvio-estuarine | |
dc.subject | deposition-stasis-erosiondeposition | |
dc.title | Exploring the significance of true substrates in a Pennsylvanian fluvio-estuarine tidal flat | |
dc.type | Article |