Firmground Zoophycos in the Lower Cretaceous Viking Formation, Alberta: A Distal Expression of the Glossifungites Ichnofacies
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Other| October 01, 2000 Firmground Zoophycos in the Lower Cretaceous Viking Formation, Alberta: A Distal Expression of the Glossifungites Ichnofacies JAMES A. MACEACHERN; JAMES A. MACEACHERN 1Earth Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada Search for other works by this author on: GSW Google Scholar JAMES A. BURTON JAMES A. BURTON 2Imperial Oil Resources, Calgary, Alberta T2P 3M9, Canada Search for other works by this author on: GSW Google Scholar PALAIOS (2000) 15 (5): 387–398. https://doi.org/10.1669/0883-1351(2000)015<0387:FZITLC>2.0.CO;2 Article history accepted: 26 Jun 2000 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation JAMES A. MACEACHERN, JAMES A. BURTON; Firmground Zoophycos in the Lower Cretaceous Viking Formation, Alberta: A Distal Expression of the Glossifungites Ichnofacies. PALAIOS 2000;; 15 (5): 387–398. doi: https://doi.org/10.1669/0883-1351(2000)015<0387:FZITLC>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyPALAIOS Search Advanced Search Abstract The substrate-controlled Glossifungites ichnofacies is a firmground suite of trace fossils that commonly demarcates erosional discontinuities in sedimentary successions. The Glossifungites ichnofacies typically is characterized by biogenic structures that are vertical to subvertical, sharp-walled, unlined and commonly passively infilled. The structures hitherto have been restricted to permanent or semi-permanent domiciles, and predominantly to vertical to subvertical burrows of suspension-feeding organisms.Several cores of the late Albian (Lower Cretaceous) Viking Formation from the Hamilton Lake Field of Alberta, Canada contain an atypical Glossifungites ichnofacies dominated by the foraging, probing and deposit-feeding/dwelling structures of firmground Thalassinoides, Rhizocorallium, and Zoophycos. The Thalassinoides are passively infilled with coarse grains of sand and chert granules. Rhizocorallium displays active stages of infill, although the final, horizontal U-shaped tube is passively filled. The Zoophycos, however, demonstrates active infill manifest by chert granules and coarse sand distributed in the spreite, and this is a departure from the normal expression of the Glossifungites ichnofacies.The firmground structures subtend from the regional stratigraphic discontinuity BD4, excavated into black, silt- and sand-poor offshore and shelf mudstones. BD4 is interpreted to reflect a transgressively modified sequence boundary. Most Zoophycos, Thalassinoides, and Rhizocorallium penetrate no deeper than 3–4 cm below the discontinuity into the underlying mudstones. Where BD4 overlies a sandier substrate, firmground Zoophycos are not present within the suite.The facies directly overlying BD4 consist of fining-upward, pebble-, granule-, and very coarse-grained sand-bearing, thoroughly burrowed muddy sandstones to sandy mudstones, typically 5–25 cm thick. This basal transgressive lag contains Teichichnus, Planolites, Palaeophycus, Diplocraterion, Chondrites and rare Helminthopsis, and is the source of the coarse-grained material incorporated into the fill of the firmground ichnogenera. The granule-bearing sandy mudstones overlying the transgressive lag contain abundant Teichichnus, Planolites, Helminthopsis, Anconichnus, Chondrites, and Terebellina, and reflect rapid deepening to proximal offshore conditions. Progressive deepening is recorded in the accumulation of distal offshore and shelf mudstones of the late Albian Westgate Formation.Although excavation of BD4 occurred above fairweather wave base, its colonization occurred under much lower energy conditions. Within distal softground settings, ichnogenera capable of deeply penetrating muddy substrates are largely restricted to Zoophycos, Thalassinoides, Rhizocorallium, and Chondrites. These ichnogenera constitute forms capable of being excavated, albeit shallowly, within a firm substrate. This is a low energy, distal expression of the Glossifungites ichnofacies. You do not currently have access to this article.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| 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 | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 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 découle