Spatial, temporal and palaeoecological significance of exhumed firmgrounds and other associated substrate types in Netarts Bay, Oregon, USA
Bibliographic record
Abstract
Important palaeoecologic and stratigraphic information can be obtained by observing trace assemblages within various substrate types in a modern intertidal marine environment. Overall, there has been a lack of studies conducted concerning quantitative firmness measurements on firmground, stiffground and softground substrates in a modern intertidal setting, and the combined palaeoecological and stratigraphic significance of such substrates. This study assesses the sedimentologic and neoichnologic nature of associated peaty-clay firmground, silty-sand firmground, woodground, stiffground and softground substrates in Netarts Bay, Oregon, USA, to gain a more complete understanding of the potential palaeoecologic and stratigraphic utility of these substrates in an intertidal setting. A north–south-oriented transect was conducted along the eastern margin of Netarts Bay where descriptions of surface and sub-surface biogenic and sedimentary structures were conducted via trenching, boxcoring and epoxy resin casting with results recorded and photographed. A sample of 18 different organisms creating biogenic structures were obtained, stored in glass jars and preserved with an 80% ethyl alcohol solution. Quantitative substrate firmness measurements were conducted on four of the five different substrate types using a modified Brinell firmness test. In Netarts Bay, firmground substrates and associated trace assemblages displaying larger, more robust, vertical traces likely have a higher preservation potential compared with stiffground to softground substrates that have trace assemblages composed of smaller traces that tend to grade into a horizontal position. Firmground substrate in Netarts Bay display more homogenous and firmer profiles (1.28 × 106 Pa to 2.77 × 106 Pa) than those of more heterogeneous stiffground (1.37 × 105 Pa to 2.44 × 106 Pa) and softground (8.60 × 104 Pa to 3.73 × 105 Pa) substrate. The relatively planar Pleistocene-aged firmground substrates and associated in situ woodground substrates at Netarts Bay were found to be laterally extensive and mappable stratigraphically significant surfaces. This is in contrast to the highly variable, non-significant, erosionally derived stiffground and bay-derived softground substrates that are neither extensive nor mappable. Trace assemblages in the peaty-clay and silty-sand firmgrounds studied were representative of a Glossifungites ichnofacies assemblage while associated in situ woodground trace assemblages comprised localized Teredolites ichnofacies assemblages Firmground, Neoichnology, Netarts Bay, Glossifungites, Teredolites.
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.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".