Continental ichnology of the Lower McMurray Formation inclined heterolithic strata at Daphne Island, Athabasca River, north-eastern Alberta, Canada
Bibliographic record
Abstract
Research Article| June 01, 2016 Continental ichnology of the Lower McMurray Formation inclined heterolithic strata at Daphne Island, Athabasca River, north-eastern Alberta, Canada B.S. Harris; B.S. Harris Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar E.R. Timmer; E.R. Timmer Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar M.J. Ranger; M.J. Ranger Ranger Geoscience, Chestermere, AB T1X 1B6, Canada Search for other works by this author on: GSW Google Scholar M.K. Gingras M.K. Gingras Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information B.S. Harris Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada E.R. Timmer Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada M.J. Ranger Ranger Geoscience, Chestermere, AB T1X 1B6, Canada M.K. Gingras Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada Publisher: Canadian Society of Petroleum Geologists Received: 20 Nov 2015 Accepted: 22 May 2016 First Online: 03 Oct 2017 Online Issn: 2368-0261 Print Issn: 0007-4802 © the Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2016) 64 (2): 218–232. https://doi.org/10.2113/gscpgbull.64.2.218 Article history Received: 20 Nov 2015 Accepted: 22 May 2016 First Online: 03 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation B.S. Harris, E.R. Timmer, M.J. Ranger, M.K. Gingras; Continental ichnology of the Lower McMurray Formation inclined heterolithic strata at Daphne Island, Athabasca River, north-eastern Alberta, Canada. Bulletin of Canadian Petroleum Geology 2016;; 64 (2): 218–232. doi: https://doi.org/10.2113/gscpgbull.64.2.218 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 McMurray Formation comprises fluvial, estuary, delta and embayment deposits, for which the ichnology is well studied. Workers have recognized the dominantly brackish-water character of trace-fossil assemblages and those studies have contributed heavily to the interpretation of the deposit. This study considers the significance of lower McMurray Formation strata that contain a continental trace fossil assemblage.The studied outcrops comprise a coarse-grained sandstone channel that overlies and crosscuts large-scale, unidirectionally-dipping, interbedded, fine-grained sandstone and minor siltstone (i.e. Inclined Heterolithic Stratification referred to henceforth as IHS). Both lithofacies are overlain by a pedogenically altered clayey siltstone. The coarse-grained channel contains oriented wood clasts, and lacks bioturbation. The cross-cut IHS is devoid of large wood clasts and is commonly bioturbated. The IHS locally displays beds of granular sandstone that are lithologically similar to the channel sandstones.The IHS-associated trace fossil assemblage is composed of a range of forms that hitherto now, have not been formally reported from the McMurray Formation. Trace fossils that contain irregular back-fill and burrow diameters, as well as varying orientations, are assigned to a range of adhesive meniscate backfilled burrows, including the ichnogenus Naktodemasis and Taenidium. Collectively, these trace fossils are associated with insect larvae and are taken as indicators of freshwater sedimentation. Other trace fossils, such as Siphonichnus and Cylindrichnus, are interpreted to be associated with low-salinity waters: as such the outcrops most likely represent sedimentation in the innermost estuary, with the coarse-grained channel representing a cross-cutting fluvial deposit.The fresh-water and low-salinity trace fossil assemblage has not previously been described in the McMurray Formation. Importantly, the presence of continental and brackish-water trace fossils together offers a perspective of this McMurray locale. Lithologically, the fluvial and estuary deposits are clearly discernible. 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.
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) | 0.011 | 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".