Multivariate analysis of Late Cretaceous Kanguk Formation (Arctic Canada) palynomorph assemblages to identify nearshore to distal marine groupings
Bibliographic record
Abstract
Research Article| June 01, 2007 Multivariate analysis of Late Cretaceous Kanguk Formation (Arctic Canada) palynomorph assemblages to identify nearshore to distal marine groupings L.V. Hills; L.V. Hills Department of Geology, University of Calgary and Geophysics, 2500 University Drive NW, Calgary, AB T2N 1N4 Search for other works by this author on: GSW Google Scholar W. L Strong W. L Strong Faculty of Environmental Design, University of Calgary and Geophysics, 2500 University Drive NW, Calgary, AB T2N 1N4 Search for other works by this author on: GSW Google Scholar Author and Article Information L.V. Hills Department of Geology, University of Calgary and Geophysics, 2500 University Drive NW, Calgary, AB T2N 1N4 W. L Strong Faculty of Environmental Design, University of Calgary and Geophysics, 2500 University Drive NW, Calgary, AB T2N 1N4 Publisher: Canadian Energy Geoscience Association Received: 13 Oct 2006 Accepted: 25 Apr 2007 First Online: 03 Oct 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2007) 55 (2): 160–172. https://doi.org/10.2113/gscpgbull.55.2.160 Article history Received: 13 Oct 2006 Accepted: 25 Apr 2007 First Online: 03 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation L.V. Hills, W. L Strong; Multivariate analysis of Late Cretaceous Kanguk Formation (Arctic Canada) palynomorph assemblages to identify nearshore to distal marine groupings. Bulletin of Canadian Petroleum Geology 2007;; 55 (2): 160–172. doi: https://doi.org/10.2113/gscpgbull.55.2.160 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 Statistical techniques were used to differentiate palynomorph groups within two sections of the Kanguk Formation located in northern Canada. Hierarchical cluster analyses were used to classify separately 39 samples from Remus Creek (Ellesmere Island) and 115 samples from Glacier Fiord (Axel Heiberg Island). The former site is located nearest the margin of the Svendrup Basin. The two sections are separated by a distance of 180 km. A total of 437 palynomorph taxa occurred in the two sections. Compositional differentiation of the recognized cluster analysis groups was based on nonparametric Kruskal-Wallis tests, with verification of their distinctiveness based on detrended correspondence analysis ordination. These latter techniques were also used to correlate the separately compiled groups. Seven palynomorph groups were recognized which were considered to represent nearshore, offshore, and distal marine environments. The nearshore groups were dominated by Taxodiaceaepollenites hiatus (Potonié) Kremp 1949 with important secondary quantities of Psiloschizosporis cooksoniae (Pocock) Ke & Shi 1978 (Groups B and C), Trithyrodinium suspectum (Manum & Cookson) Davey 1969 (Group H), and Stereisporites antiquasporites (Wilson & Webster) Dettmann 1963 (Group I). A diverse mixture of marine palynomorphs comprised the offshore zone, with Trithyrodinium suspectum both a common and highly constant element. Kallosphaeridium ?ringnesiorum (Manum & Cookson) Helby 1987 dominated (25%) the composition of a distal marine group. Examination of individual taxa and associated attributes reveals that four primary distribution patterns occurred: an increase towards shore, an increase away from shore, a peak in the offshore zone, and those restricted to one zone. Stratigraphic profiles of the palynomorph groups suggest that the lower half of Remus Creek section was dominated by an offshore marine zone, with two major regression-transgression stages, followed by a shift toward nearshore conditions (Group C). Conditions at Glacier Fiord gradually shifted from distal marine through offshore to nearshore. The results of this study suggest that techniques such as cluster analysis and ordination in combination with comparative statistics could be useful tools for facilitating the classification, characterization, and comparison of complex multivariate paleopalynological data. 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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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) | 0.004 | 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".