Taphonomic Controls on Animal Tracks at Saline, Alkaline Lake Bogoria, Kenya Rift Valley: Impact of Salt Efflorescence and Clay Mineralogy
Bibliographic record
Abstract
Abstract The morphologies of subaerial vertebrate tracks and invertebrate traces in surficial sediments can be used in paleoenvironmental reconstructions by providing details about the initial substrate conditions (e.g., water content) and any changes experienced during trace preservation. A qualitative field study was undertaken to identify the factors affecting track taphonomy in saline lake-margin environments, supported by experiments to isolate selected factors that modify track morphology and substrate characteristics. Flamingo tracks, ubiquitous around saline, alkaline Lake Bogoria in the Kenya Rift, were the focus of field study, although other vertebrate tracks and surficial invertebrate trails and tunnels were also considered. A complex and interacting set of environmental factors were identified, such as the effect of lake-level fluctuations on substrate grain size and capillary evaporation. Several factors affect the early taphonomic modification, destruction, stabilization, and/or cementation of tracks and their associated substrates. The laboratory experiments tested the effects of pore-water salinity, clay mineralogy (e.g., swelling or non-swelling clays), drying method (e.g., solar radiation or wind), and wetting-and-drying cycles on tracks. These data were supported by statistical analyses of impression depth and planimetric area. The results show that track morphology in smectitic substrates is altered rapidly by wetting and drying, particularly if the substrates contain saline pore waters, but morphology is less affected in non-swelling clays. The degree of morphologic alteration and/or resistance to wetting and drying varies with the rate of substrate drying and the type of the resulting salt efflorescence (e.g., interstitial vs. surficial crust). These short-term, process-related taphonomic effects help to explain the morphologic variants of tracks in lake-marginal settings, and provide insights into the preserved distribution patterns of subaerial ichnofossil assemblages.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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".