{"id":"W4410630133","doi":"10.1016/j.earscirev.2025.105169","title":"Foundational uncertainties in terminal Ediacaran chronostratigraphy revealed by high-precision zircon U-Pb geochronology of the Nama Group, Namibia","year":2025,"lang":"en","type":"article","venue":"Earth-Science Reviews","topic":"Paleontology and Stratigraphy of Fossils","field":"Earth and Planetary Sciences","cited_by":8,"is_retracted":false,"has_abstract":true,"ca_institutions":"Université du Québec à Montréal","funders":"Natural Environment Research Council; Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung; UK Research and Innovation","keywords":"Geochronology; Zircon; Chronostratigraphy; Geology; Geochemistry; Group (periodic table); Paleontology; Chemistry","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.001564361,0.0004854452,0.000295877,0.001471742,0.0005154248,0.001394752,0.000566763,0.0003263695,0.000729445],"category_scores_gemma":[0.004374805,0.0002694776,0.0002980491,0.002172219,0.0005328752,0.0006320269,0.0007974432,0.0001887386,0.0001549688],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.001250486,"about_ca_system_score_gemma":0.0004768215,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.05012664,"about_ca_topic_score_gemma":0.09366047,"domain_scores_codex":[0.9993985,0.0001936302,0.00007778334,0.0002001476,0.00007094863,0.00005900123],"domain_scores_gemma":[0.9991704,0.0002346278,0.0002271221,0.0001791098,0.000148337,0.00004040637],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.0002217098,0.00001705443,0.9390758,0.000100565,0.0002854969,0.000392264,0.001802406,0.00895227,0.00694053,0.001577607,0.0002823595,0.04035196],"study_design_scores_gemma":[0.000007729991,0.00001728315,0.9840196,0.00008939848,0.00008250766,0.0001159575,0.0007889491,0.009713169,0.001336105,0.0006846822,0.003129479,0.00001512355],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.99334,0.0009084698,0.001848162,0.00009547672,0.000009500645,0.000007328127,0.0009666715,0.00003485518,0.002789641],"genre_scores_gemma":[0.9986578,0.000194997,0.0006804381,0.00001000248,0.000002881959,0.000004397766,0.0003640498,0.00000974099,0.00007556099],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.05012664,"threshold_uncertainty_score":0.09966975,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.00958393713176711,"score_gpt":0.2477227270639836,"score_spread":0.2381387899322165,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}