Paleovalley systems in the Upper Cretaceous Dunvegan Formation, Alberta and British Columbia
Bibliographic record
Abstract
Research Article| June 01, 2002 Paleovalley systems in the Upper Cretaceous Dunvegan Formation, Alberta and British Columbia A. Guy Plint A. Guy Plint Department of Earth Sciences, University of Western Ontario, London, ON N6A 5B7 Search for other works by this author on: GSW Google Scholar Author and Article Information A. Guy Plint Department of Earth Sciences, University of Western Ontario, London, ON N6A 5B7 Publisher: Canadian Society of Petroleum Geologists Received: 15 May 2001 Revision Received: 15 Nov 2001 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2002) 50 (2): 277–296. https://doi.org/10.2113/50.2.277 Article history Received: 15 May 2001 Revision Received: 15 Nov 2001 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A. Guy Plint; Paleovalley systems in the Upper Cretaceous Dunvegan Formation, Alberta and British Columbia. Bulletin of Canadian Petroleum Geology 2002;; 50 (2): 277–296. doi: https://doi.org/10.2113/50.2.277 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 SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract The Cenomanian Dunvegan Formation is divided into ten regressive–transgressive allomembers designated J–A in ascending order, and represents a large delta complex deposited over about 2 m.y. Valley systems were mapped on the upper surfaces of allomembers H to E, using 4800 well logs and 40 outcrop sections distributed over 50,000 km2. Valleys trend broadly NW to SE across a delta plain that expanded in width from 150 to over 300 km during progradation of the deltas that comprise allomembers H to E. The longest valley can be traced for up to 330 km. A few valleys can be traced seaward into low-sinuosity distributaries feeding delta lobes. Most other valleys disappear within 20–30 km of the low-stand delta front, at a point interpreted to separate the falling stage from the lowstand systems tract. Most valley systems have a dendritic pattern, although an apparently anastomosed pattern is observed in some areas. Individual valley reaches have a strong NW–SE and NE–SW preferred orientation, with abrupt, approximately right-angle bends and junctions. These valley trends mimic those of faults in the underlying Carboniferous rocks. Valley depths range between 15 and 40 m, and average depths range from 19.1 to 23.8 m, with an overall average of 21.3 m. There is no systematic variation in depth along the length of individual valleys. Valleys are typically 1 to 2 km wide, but can expand to a maximum of 10 km, sometimes, but not always in the vicinity of confluences. Valley-fills are dominated by fine- to medium-grained sandstone, up to 97% in some wells. Sandstone probably represents multi-storey point bars. Mudstone tends to form a greater part of the fill (up to 50%), in more seaward reaches. Muddy deposits are generally concentrated in the upper 5–15 m of valley-fills, where muddier-upward units might represent heterolithic point-bars and/or tidal flats whereas sandier-upward units could represent bay-head deltas. Valley incision is considered to be most probably attributable to eustasy coupled with climatically driven changes in the ratio of sediment load to discharge. Neither tectonic tilting, nor changes in the rate of subcrustal loading appear to provide plausible explanations for incision and filling. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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How this classification was reachedexpand
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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.017 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".