{"id":"W2342103637","doi":"10.1073/pnas.1601925113","title":"No evidence for high atmospheric oxygen levels 1,400 million years ago","year":2016,"lang":"en","type":"letter","venue":"Proceedings of the National Academy of Sciences","topic":"Geochemistry and Elemental Analysis","field":"Earth and Planetary Sciences","cited_by":52,"is_retracted":false,"has_abstract":true,"ca_institutions":"University of Alberta","funders":"","keywords":"Atmospheric oxygen; Oxygen; Zhàng; Environmental chemistry; Environmental science; Proterozoic; Earth science; Atmospheric sciences; Chemistry; Geology; China; Paleontology; Geography; Archaeology","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":"codex-gemma-dda1882f352a","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.001150227,0.0001784417,0.0002748191,0.00004793969,0.0002286481,0.0000453163,0.001484894,0.0002843298,0.000838607],"category_scores_gemma":[0.0004563478,0.0001068717,0.0002019549,0.0005924003,0.0006806523,0.0005078144,0.00005967647,0.000295995,0.00003135588],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.00001578206,"about_ca_system_score_gemma":0.00005536111,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.0001094756,"about_ca_topic_score_gemma":5.342958e-7,"domain_scores_codex":[0.9972976,0.000008702842,0.0004199776,0.0004406931,0.001521987,0.0003110839],"domain_scores_gemma":[0.9985146,0.0003993794,0.0007152919,0.00001507971,0.0003181242,0.00003752607],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"not_applicable","study_design_gemma":"not_applicable","study_design_scores_codex":[0.00007614651,0.00001605335,0.02193545,0.0008655941,0.0001725206,1.096531e-7,0.00007676822,0.000183903,0.02970351,0.0002865131,0.9389284,0.007755041],"study_design_scores_gemma":[0.000838799,0.0005621692,0.3531767,0.002860607,0.0004272657,0.00003287314,0.0001251298,0.002928779,0.08705468,0.1415378,0.4090571,0.001398073],"study_design_candidate":"not_applicable","study_design_consensus":"not_applicable","genre_codex":"commentary","genre_gemma":"empirical","genre_scores_codex":[0.356593,0.001475114,0.000004570023,0.6283855,0.0003093104,0.0009274384,0.001743773,0.00003952621,0.01052178],"genre_scores_gemma":[0.9246729,0.0001868138,0.00387977,0.06069973,0.002589552,0.00001234491,0.00001269028,0.000006458226,0.007939741],"genre_candidate":"empirical","genre_consensus":null,"teacher_disagreement_score":0.5680799,"threshold_uncertainty_score":0.9182159,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.06083792113262605,"score_gpt":0.2789892841661131,"score_spread":0.2181513630334871,"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."}}