{"public_id":"CTF-PAL-000002","vault":"PAL","record_type":"reconstruction","record_type_label":"Reconstruction","title":"Parasaurolophus crest resonance, reconstructed call","summary":"A modelled low-frequency call derived from the crest's internal airways. A reconstruction, not a recording.","description":"The nasal passages of the crest were modelled as a resonating tube and its fundamental and first harmonics were synthesised. The result shows what frequencies the crest could have favoured. It cannot show what the animal actually sounded like, how loud it was or when it called.","evidence_tier":"T4","verification_status":"expert","time":{"start":-76500000,"end":-74000000,"precision":"geological-stage","uncertainty_years":1000000,"dating_method":"biostratigraphy","geological_interval":"campanian","bands":["deep"]},"geometry_public":{"type":"region","region_id":"southern-alberta","centroid":[-111.5,50.8]},"precision_class":"region","sensitivity_class":"restricted","sensitivity_reason":"looting-risk","locality_public":"Dinosaur Park Formation, southern Alberta, Canada","place":{"id":"dinosaur-provincial-park","name":"Dinosaur Provincial Park","type":"fossil-locality"},"region":{"id":"southern-alberta","name":"Southern Alberta badlands","geojson_path":"/generated/regions/southern-alberta.geojson"},"taxon":{"id":"parasaurolophus-walkeri","name":"Parasaurolophus walkeri","common":"Parasaurolophus","extant":false,"gbif_key":4967371},"reconstruction":{"method_ref":"crest-resonance","method_title":"Crest resonance modelling","confidence_statement":"Moderate confidence in the resonant frequencies (within about 20 percent). No confidence in timbre, rhythm or loudness, which are unknowable from the fossil.","derived_from":[{"id":"CTF-PAL-000001","title":"Parasaurolophus walkeri holotype, ROM 768","tier":"T1"}]},"rights":{"licence":"CC-BY-4.0","licence_label":"CC BY 4.0","licence_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Chronos Terra Foundation reconstruction after Diegert and Williamson 1998 (illustrative placeholder audio)","rights_holder":"Chronos Terra Foundation","source_name":"Chronos Terra Foundation","source_url":"https://chronos-terra.example.org/methods/crest-resonance","retrieved_on":"2026-09-01","mode":"hosted","citation":"Chronos Terra Foundation (2026). Parasaurolophus crest resonance, reconstructed call. CTF-PAL-000002."},"media":[{"role":"access","path":"/media/CTF-PAL-000002.wav","media_type":"audio/wav","alt":"Synthesised low resonant tone representing the modelled crest frequencies. Placeholder audio.","duration_s":3,"processing_state":"edited"},{"role":"spectrogram","path":"/media/CTF-PAL-000002-spectrogram.png","media_type":"image/png","alt":"Spectrogram of the reconstructed call showing energy concentrated at low frequencies.","processing_state":"edited"}],"links":[{"to":"CTF-PAL-000001","to_title":"Parasaurolophus walkeri holotype, ROM 768","to_vault":"PAL","to_tier":"T1","type":"reconstruction-of","label":"Reconstruction of","tier":"T4","note":"The call is modelled from the crest airways of this specimen and its relatives.","citation":"Diegert, C. F. and Williamson, T. E. (1998). A digital acoustic model of the lambeosaurine hadrosaur Parasaurolophus tubicen. Journal of Vertebrate Paleontology 18(3).","direction":"out","to_time":{"start":-76500000,"end":-74000000}}],"vault_fields":{"call_type":"resonance","anatomical_basis":"nasal crest airway model"},"paleo":{"30":[-105.863,51.94],"75":[-87.559,55.678],"150":[-49.215,41.608],"200":[-40.131,32.383],"300":[-37.612,23.624]},"registry":{"registered_on":"2026-09-01","version":"60a7d3144f02","url":"https://chronos-terra.example.org/records/CTF-PAL-000002","json_url":"https://chronos-terra.example.org/generated/records/CTF-PAL-000002.json"}}