Stratigraphy, Depositional Environments and Ichnology of the Lower Paleozoic in the Azul Pampa Area - Jujuy Province
Bibliographic record
Abstract
Cambrian-Ordovician deposits are widely represented in the Azul Pampa area, Cordillera Oriental, Jujuy Province. The stratigraphic column begins with the Meson Group (Lower to Middle Cambrian) which records shallow-marine sedimentation in a tide-dominated environment. The Meson Group includes the Lizoite, Campanario and Chalhualmayoc formations. The Lizoite and Chalhualmayoc formations contain subtidal sandbar deposits similar to those farther south in the Quebrada de Humahuaca region and surrounding areas. The Campanario Formation includes intertidal flat and channels deposits, representing the regressive maximum of the Meson Group. Overlying the Meson Group is an Upper Cambrian to Arenigian succession previously referred to as the Casayok Sandstones and Azul Pampa Formation. Integrated sedimentologic, paleontologic and sequence-stratigraphic studies indicate that these units are lithologically similar and temporarily equivalent to the Santa Rosita Formation (Upper Cambrian to Tremadocian) and the Acoite Formation (Arenigian), respectively, which are widely accepted in adjacent areas. Thus, the Casayok Sandstones and Azul Pampa Formation nomenclature can be abandoned. The lower interval of the Santa Rosita Formation is represented by tide-dominated estuarine deposits of the Pico de Halcon Member, while the upper interval is included in the Alfarcito Member and consists of wave-dominated shallow-marine deposits, ranging from the upper shoreface to the lower offshore and displaying a series of transgressive-regressive cycles. The Acoite Formation records a basinwide maximum transgressive episode and is dominated by shelf deposits with subordinate offshore deposits. There is an absence or scarcity of bioturbation in high-energy settings, an increase in ichnodiversity along salinity gradients, an abundance of firm substrates in Cambrian marginal-marine environments and an increase in degree and depth of bioturbation through the Early Ordovician interval.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".