Cyclostratigraphic calibration of the Frasnian (Late Devonian) time scale (western Alberta, Canada)
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Research Article| May 01, 2012 Cyclostratigraphic calibration of the Frasnian (Late Devonian) time scale (western Alberta, Canada) David De Vleeschouwer; David De Vleeschouwer † 1Earth System Sciences and Department of Geology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium †E-mail: dadevlee@vub.ac.be Search for other works by this author on: GSW Google Scholar Michael T. Whalen; Michael T. Whalen 2Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska 99775-5780, USA Search for other works by this author on: GSW Google Scholar James E. (Jed) Day; James E. (Jed) Day 3Department of Geography-Geology, Illinois State University, Normal, Illinois 61790-4400, USA Search for other works by this author on: GSW Google Scholar Philippe Claeys Philippe Claeys 1Earth System Sciences and Department of Geology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium Search for other works by this author on: GSW Google Scholar Author and Article Information David De Vleeschouwer † 1Earth System Sciences and Department of Geology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium Michael T. Whalen 2Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska 99775-5780, USA James E. (Jed) Day 3Department of Geography-Geology, Illinois State University, Normal, Illinois 61790-4400, USA Philippe Claeys 1Earth System Sciences and Department of Geology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium †E-mail: dadevlee@vub.ac.be Publisher: Geological Society of America Received: 19 May 2011 Revision Received: 06 Oct 2011 Accepted: 06 Oct 2011 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2012 Geological Society of America GSA Bulletin (2012) 124 (5-6): 928–942. https://doi.org/10.1130/B30547.1 Article history Received: 19 May 2011 Revision Received: 06 Oct 2011 Accepted: 06 Oct 2011 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation David De Vleeschouwer, Michael T. Whalen, James E. (Jed) Day, Philippe Claeys; Cyclostratigraphic calibration of the Frasnian (Late Devonian) time scale (western Alberta, Canada). GSA Bulletin 2012;; 124 (5-6): 928–942. doi: https://doi.org/10.1130/B30547.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Until now, the duration of the Frasnian Stage has remained very poorly constrained, hampering a detailed understanding of sedimentation processes and environmental and evolutionary change. In this study, time-series analyses of high-resolution (10–20 k.y.) magnetic susceptibility data identify sixteen 405 k.y. eccentricity cycles in the magnetic susceptibility stratigraphy of the Frasnian (Late Devonian), derived from carbonate-platform and surrounding slope and basin deposits in western Alberta, Canada. Previous studies demonstrated the generally consistent pattern of magnetic susceptibility change across the Alberta basin and thus demonstrated the utility of magnetic susceptibility stratigraphy as a refined regional correlation tool compared to biostratigraphy. In the present study, we show that the magnetic susceptibility stratigraphy of the Frasnian interval in western Alberta has been significantly influenced by astronomical forcing. Using the sixteen 405 k.y. eccentricity cycles as a geochronometer, we constructed a Frasnian astronomical time scale. This time scale indicates a duration of 6.5 ± 0.4 m.y. for the Frasnian. Calibrating this duration to the best available Devonian chronology, the absolute age of the Givetian-Frasnian boundary is recalculated to 383.6 ± 3.0 Ma, and the age of the Frasnian-Famennian boundary is recalculated to 376.7 ± 3.0 Ma. These new absolute ages take into account the astronomically derived duration of the Frasnian, but they also yield a narrowing of the error margins of the absolute ages by several hundreds of thousands of years. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.020 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it