{"id":"W2884809501","doi":"10.1073/pnas.1806216115","title":"Constraints on Paleoproterozoic atmospheric oxygen levels","year":2018,"lang":"en","type":"article","venue":"Proceedings of the National Academy of Sciences","topic":"Paleontology and Stratigraphy of Fossils","field":"Earth and Planetary Sciences","cited_by":125,"is_retracted":false,"has_abstract":true,"ca_institutions":"University of Victoria","funders":"Natural Sciences and Engineering Research Council of Canada","keywords":"Precambrian; Carbonate; Geology; Biosphere; Proterozoic; Atmospheric oxygen; Facies; Deglaciation; Oxygen; Earth science; Paleontology; Ecology; Chemistry; Structural basin; Glacial period","routes":{"ca_aff":true,"ca_fund":true,"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":[0.000851359,0.0005574339,0.0003484679,0.0008536816,0.0005952436,0.0009883874,0.0004618983,0.0006907537,0.00226826],"category_scores_gemma":[0.003352858,0.0003817071,0.0003145837,0.0008472391,0.0007725448,0.001134021,0.001023624,0.0007003773,0.0003507212],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0009794086,"about_ca_system_score_gemma":0.0007348736,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.02348484,"about_ca_topic_score_gemma":0.03416388,"domain_scores_codex":[0.9997216,0.00005314364,0.00003788848,0.00009495985,0.00005433225,0.00003803815],"domain_scores_gemma":[0.9993387,0.0002623109,0.0001480115,0.00007500834,0.000128986,0.00004694358],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.0003186701,0.00005041928,0.8536755,0.0003781208,0.0002952569,0.0004529628,0.0007864624,0.03992397,0.05821584,0.02089747,0.001011631,0.02399374],"study_design_scores_gemma":[0.00005111976,0.00007939125,0.900147,0.0002631966,0.0001678401,0.0002159758,0.0007205815,0.06622571,0.01046928,0.01172173,0.009848783,0.0000895371],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9861615,0.001174516,0.00376003,0.0008347899,0.00002514703,0.000005563605,0.001165491,0.00006485995,0.006808073],"genre_scores_gemma":[0.9981597,0.0004531009,0.0007083045,0.00005929243,0.000009599815,0.000004879339,0.0004127876,0.00001548526,0.0001768498],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.02348484,"threshold_uncertainty_score":0.04669625,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.04936653372624481,"score_gpt":0.2798744306238042,"score_spread":0.2305078968975594,"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."}}