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Record W2116014998

Mid Paleocene fossil floras and climate from western Scotland

2011· dissertation· en· W2116014998 on OpenAlex
Jonathan James Poulter

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

aboutThe title or abstract carries a Canadian signal from the geographic lexicon.
no affNo Canadian affiliation: this work is invisible to an affiliation-only frame.
No Canadian affiliation. An affiliation-only frame, the usual design, would never have seen this work. It is one of the works that make the case for inverting the frame.

Bibliographic record

VenueWhite Rose eTheses Online (University of Leeds, The University of Sheffield, University of York) · 2011
Typedissertation
Languageen
FieldEarth and Planetary Sciences
TopicGeology and Paleoclimatology Research
Canadian institutionsnot available
Fundersnot available
KeywordsSequoiaFagaceaeGeologyUnderstoryPodocarpaceaePinaceaeBetulaceaeVegetation (pathology)PaleontologyEcologyGeographyBotanyBiologyCanopy
DOInot available

Abstract

fetched live from OpenAlex

Fossil plants of Paleocene age (62 to 59.7 Ma) are preserved within lava sequences in the Hebrides and Northern Ireland. These lavas, collectively referred to as the British Tertiary Volcanic Group (BTVP), were formed due to rifting in the North Atlantic. The fossil floras represent forests that grew between the lavas in periods of quiescence, during which fluvio-lacustrine environments developed on the lava surfaces. The fossil plants provide information on the composition of the Paleocene vegetation and the climate during that interval. 
\nNew collections of fossil plants have been made from the Isle of Skye and other collections from Ardtun on Mull were studied. The Allt Mor locality on Skye (60.16 ± 0.45 Ma) has 
\nprovided the majority of the specimens for this study and represents a pond deposit where broadleaved angiosperm and conifer leaves accumulated. Fourteen angiosperm morphotypes 
\nhave been identified, many of which show similarities to modern families, including the Platanaceae, Cercidiphyllaceae, Betulaceae, Fagaceae, Juglandaceae, Vitaceae, Cornaceae and Trochodendraceae. Conifer fossils include three ovulate cone types and eight shoot 
\nmorphotypes attributed to the Cupressaceae and Pinaceae. The Allt Mor assemblage indicates that mixed coniferous forests developed within a palaeovalley, with the vegetation fringing the valley sides and colonising the floodplains of the valley floor. The vegetation of Allt Mor was dominated by climax conifers similar to Metasequoia, Sequoia, Chamaecyparis and Thuja. 
\nBroadleaved angiosperms such as Platanites, Trochodendroides, Corylites and "Platycarya cf" dominated the riparian margins and formed an understory of trees and shrubs in the conifer forests. Comparison with Paleocene floras from other Northern Hemisphere localities indicates 
\nthat the floras of Skye are most similar to those of the Arctic, particularly those of Svalbard, Greenland and Canada, and were thus part of the Arcto-Tertiary floras of the northern high latitudes. 
\nPalaeoclimate estimates derived from the fossil angiosperm leaves indicate that the climate of Skye had a mean annual temperature (MAT) of -5°C to 9°C, was seasonal with warm summers (warm month mean 19.0°C to 25.8°C) and cool to cold winters (cold month mean -3.0°C to 4.2°C). Comparisons with the flora of Ardtun on Mull (60.5 ± 0.3 Ma) reveal that, although these floras share many of the same taxa, the flora is different, with angiosperms dominant, and the conifers that are common in the Allt Mor assemblage are rare or absent. The Ardtun flora also contains thermophilic plants such as Camptodromites major, C. multinervatus and 
\nAmentotaxus gladifolia, which are not present on Skye. Palaeoclimatedata from these fossil plants indicate significant cooling during the mid-Paleocene, confirmed by other marine and terrestrial proxies, marking a cool climate phase in the middle of the otherwise globally warm Paleocene climate.

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.

Full frame distilled prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesMeta-epidemiology (narrow), Insufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: Observational
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.327
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0010.000
Bibliometrics0.0000.000
Science and technology studies0.0010.002
Scholarly communication0.0000.000
Open science0.0020.000
Research integrity0.0010.001
Insufficient payload (model declined to judge)0.0040.000

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.

Opus teacher head0.021
GPT teacher head0.202
Teacher spread0.180 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it