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Record W2061561674 · doi:10.4138/179

“Such a section as never was put together before”: Logan, Dawson, Lyell, and mid-Nineteenth-Century measurements of the Pennsylvanian Joggins section of Nova Scotia

2006· article· en· W2061561674 on OpenAlex

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.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.
fundA Canadian funder is recorded on the work.
venuePublished in a venue whose home country is Canada.
aboutThe title or abstract carries a Canadian signal from the geographic lexicon.

Bibliographic record

VenueAtlantic Geology · 2006
Typearticle
Languageen
FieldArts and Humanities
TopicHistory of Science and Natural History
Canadian institutionsDalhousie University
FundersKillam TrustsDalhousie UniversityUniversity of OxfordUniversity of Minnesota
KeywordsSection (typography)Nova scotiaGeologyPennsylvanianBayPaleontologyArchaeologyStratotypeHistoryOceanography

Abstract

fetched live from OpenAlex

William Edmond Logan assumed his duties as the first head of the Geological Survey of Canada in June 1843. Two previously overlooked field notebooks provide new insight into his first field project that summer: measurement of the “Joggins section,” a classic Carboniferous locality in Nova Scotia. Inspired by reports of 40-foot-tall fossil trees, Logan spent five days measuring 14 570 feet 11 inches of strata exposed along the shore of the Bay of Fundy. Widely regarded as a meticulous, bed-by-bed measured section, closer examination reveals that many thickness values were calculated using paced distances. Realizing that his measured section was too detailed for scientific journals of the day, Logan published his work in a relatively obscure government publication where it went largely unnoticed for nearly a decade. Unaware of Logan’s measured section, John William Dawson and Charles Lyell visited Joggins in 1852 and measured the section for themselves. Dawson later stated that the two sections contain only minor differences, but careful comparison shows that they have radically different descriptions and measurements for even the most distinctive beds. Dawson disguised these discrepancies in post-1855 editions of his book Acadian Geology by rewriting much of the measured section and abandoning many of his own observations. Although over 200 subsequent Joggins studies build upon these measured sections, the present study represents the first detailed examination of the two historical sections and reveals previously unknown discrepancies between two of the most important early geologic studies undertaken in Nova Scotia. Resumé William Edmond Logan est devenu le premier responsable de la Commission géologique du Canada en juin 1843. Deux carnets de travaux sur le terrain, précédemment négligés, fournissent un nouvel éclairage sur son premier projet sur le terrain cet été-là : le mesurage du « stratotype de Joggins », un secteur carbonifère classique en Nouvelle-Écosse. Inspiré par des comptes rendus de la présence d’arbres fossiles de 40 pieds de hauteur, Logan a consacré cinq jours à mesurer 14 570 pieds 11 pouces de strates affleurant le long du rivage de la baie de Fundy. Un examen plus attentif de l’endroit, largement considéré comme un stratotype méticuleusement mesuré couche par couche, révèle que de nombreuses données d’épaisseur ont été calculées au nombre de pas. Se rendant compte que le stratotype qu’il avait mesuré était trop détaillé pour les revues scientifiques de l’époque, Logan avait publié ses travaux dans une publication gouvernementale relativement obscure où ils sont demeurés pratiquement inaperçus pendant près d’une décennie. John William Dawson et Charles Lyell, qui n’étaient pas au courant du stratotype mesuré par Logan, se sont rendus à Joggins en 1852 et ont mesuré le stratotype eux-mêmes. Dawson a ultérieurement laissé entendre que les deux stratotypes présentaient seulement des différences minimes, mais une comparaison attentive révèle que leurs descriptions et leurs mesures sont radicalement différentes, même dans le cas des couches les plus caractéristiques. Dawson a déguisé ces divergences dans des éditions ultérieures à 1855 de son livre Acadian Geology en remaniant une vaste part du stratotype mesuré et en abandonnant nombre de ses propres observations. Même si plus de 200 études subséquentes de Joggins se sont appuyées sur les stratotypes mesurés, la présente étude représente le premier examen détaillé des stratotypes et elle révèle des divergences auparavant inconnues entre deux des premières études géologiques les plus importantes réalisées en Nouvelle-Écosse. [Traduit par la rédaction]

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 categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.502
Threshold uncertainty score0.996

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.001
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.000

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 head0.018
GPT teacher head0.208
Teacher spread0.189 · 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