Continental ichnology of the Lower McMurray Formation inclined heterolithic strata at Daphne Island, Athabasca River, north-eastern Alberta, Canada
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Résumé
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.
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Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,002 | 0,003 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,004 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».