FROM COSMOS
TO CIVILIZATION
All episodes/Episode 5.2

Episode 5.2 · 25 min

The Cambrian Explosion

The Cambrian transformation of marine ecosystems: deeper burrows, skeletons, jointed legs, eyes, and predators, seen through Chengjiang and Burgess Shale fossils.

Watch this film on YouTube ↗

Visual credits

46 sources

Sources and credits for imagery used in this film, including material incorporated into explanatory animations.

Animation design references 5 sources

These works informed the design of explanatory animations. A reference listed here is not necessarily reproduced on screen.

Research references

Selected sources from the episode’s research and scientific figures.

  1. DOI: 10.1126/science.1206375 ↗
  2. DOI: 10.1038/s41559-019-0821-6 ↗
  3. DOI 10.1111/ter.12368 ↗
  4. DOI: 10.1130/G31036.1 ↗
  5. DOI: 10.1038/s41467-022-29246-z ↗
  6. DOI: 10.1038/46965 ↗
  7. DOI: 10.1016/j.cub.2024.05.026 ↗
  8. DOI: 10.1038/nature14573 ↗
  9. DOI: 10.1186/s13227-024-00222-6 ↗
  10. DOI: 10.1098/rspb.2023.0638 ↗
  11. DOI: 10.1038/nature10689 ↗
  12. DOI: 10.1126/sciadv.abc6721 ↗
  13. article ↗
  14. DOI: 10.1038/41786 ↗
  15. DOI: 10.1126/science.1085672 ↗
  16. PMC ↗
  17. DOI: 10.1016/j.chemgeo.2025.122890 ↗
  18. DOI: 10.1126/sciadv.ads2846 ↗
  19. DOI: 10.1038/s41586-026-10590-9 ↗
  20. DOI: 10.1038/s41586-025-10030-0 ↗
  21. linnemann 2019 boundary ↗
  22. GSSP slab photograph ↗
  23. Yangjiagou assemblage plate ↗
  24. *Haikouichthys* museum specimen ↗
  25. *Fuxianhuia protensa* specimen ↗
  26. Royal Tyrrell display specimen ↗
  27. *Anomalocaris* and *Echidnacaris* eyes ↗
  28. USNM PAL 57683 ↗
  29. USNM PAL 83935 ↗
  30. USNM PAL 57674 ↗
  31. *Wiwaxia* specimen crop ↗
  32. USNM PAL 57628 ↗
  33. 2024 flipped schematic ↗
  34. 31 Aug.–3 Sep. 1909 field notebook ↗
  35. Cambrian *Elrathia* injury ↗
  36. https://commons.wikimedia.org/wiki/File:Fuxianhuia_protensa_(YPM_IP_421686).jpg ↗
  37. https://commons.wikimedia.org/wiki/File:Anomalocaris_canadensis_(TMP_2023.003.0003),_Royal_Tyrrell_Museum,_Drumheller,_Alberta,_2025-07-13.jpg ↗
  38. https://commons.wikimedia.org/wiki/File:Field_notebook_of_Charles_D._Walcott_from_August_31_to_September_3,_1909.jpg): ↗
  39. https://commons.wikimedia.org/wiki/File:Elrathia_kingii_fossil_trilobite_with_healed_bite_mark_(Wheeler_Formation,_Middle_Cambrian;_House_Range,_western_Utah,_USA)_2_(15252026101).jpg): ↗
  40. ics chart 2026 06 ↗
  41. DOI: 10.1017/S0016756811000720 ↗
  42. DOI: 10.1144/jgs2017-103 ↗
  43. DOI 10.1144/jgs2015-083 ↗
  44. PMC ↗
  45. How old is the Burgess Shale? ↗
  46. DOI: 10.1017/pab.2019.42 ↗
  47. Fortunian GSSP ↗
  48. Fortune Head paper ↗
  49. HAL record ↗
  50. DOI: 10.1111/gbi.12550 ↗
  51. DOI: 10.1111/brv.12614 ↗
  52. *Treptichnus pedum* diagram ↗
  53. 3-D diagram ↗
  54. Tanafjord *T. pedum* specimen ↗
  55. PMC ↗
  56. Scandinavian University Press ↗
  57. https://commons.wikimedia.org/wiki/File:Treptichnus_pedum_from_the_Fortunian_(lowermost_Cambrian)of_Tanafjord,_Norway.png ↗
  58. Nature Communications ↗
  59. Chengjiang Fossil Site ↗
  60. BioOne ↗
  61. Nature Communications article ↗
  62. PMC ↗
  63. DOI: 10.1111/j.1502-3931.2010.00239.x ↗
  64. BMC Evolutionary Biology ↗
  65. National Science Review ↗
  66. paper record ↗
  67. Commons ↗
  68. book source ↗
  69. PNAS/PMC ↗
  70. DOI: 10.1038/nature01264 ↗
  71. DOI: 10.1038/s41586-025-09966-0 ↗
  72. Science ↗
  73. DOI: 10.1126/science.ade9707 ↗
  74. museum specimen ↗
  75. *Eoredlichia intermedia* ↗
  76. *Microdictyon sinicum* specimen ↗
  77. open paper figure ↗
  78. The Walcott Quarry community ↗
  79. ROM *Marrella splendens* ↗
  80. ROM *Opabinia regalis* ↗
  81. DOI: 10.1111/j.1502-3931.2011.00264.x ↗
  82. Nature ↗
  83. ROM species page ↗
  84. ROM *Wiwaxia corrugata* ↗
  85. Proceedings B ↗
  86. ROM *Anomalocaris canadensis* ↗
  87. PMC ↗
  88. ROM *Hurdia victoria* ↗
  89. PMC ↗
  90. ROM species page ↗
  91. DOI: 10.1098/rsos.242122 ↗
  92. ROM *Olenoides serratus* ↗
  93. ROM *Canadaspis perfecta* ↗
  94. ROM *Sidneyia inexpectans* ↗
  95. ROM *Burgessochaeta setigera* ↗
  96. ROM *Ottoia prolifica* ↗
  97. ROM *Pikaia gracilens* ↗
  98. field notes ↗
  99. discovery record ↗
  100. Burgess Shale collection ↗
  101. ROM Burgess Shale projects ↗
  102. ROMIP 51214 ↗
  103. open head figure ↗
  104. Smithsonian object record ↗
  105. Burgess Shale fossils ↗
  106. BioOne ↗
  107. DOI: 10.1007/s00114-012-0910-8 ↗
  108. DOI: 10.1080/14772019.2023.2225066 ↗
  109. Fossilised *Anomalocaris*-type eye ↗
  110. *Echidnacaris* eye ↗
  111. PMC context ↗
  112. PLOS ONE ↗
  113. https://commons.wikimedia.org/wiki/File:Elrathia_kingii_fossil_trilobite_with_healed_bite_mark_(Wheeler_Formation,_Middle_Cambrian;_House_Range,_western_Utah,_USA)_2_(15252026101).jpg ↗
  114. DOI: 10.1111/j.1469-185X.1999.tb00046.x ↗
  115. ROM stem/crown explanation ↗
  116. PMC ↗
  117. Nature ↗
  118. Current Biology ↗
  119. https://www.cell.com/current-biology/fulltext/S0960-9822(24)00669-9 ↗
  120. FBgg0000363 ↗
  121. PMC ↗
  122. Hox genes in *Drosophila* ↗
  123. Open Drosophila CNS Hox expression figure ↗
  124. MBL Drosophila embryo Hox panels ↗
  125. MDPI mouse/Hox schematic ↗
  126. Open vertebrate Hox figure ↗
  127. University of Utah Hox explainer ↗
  128. Development ↗
  129. Development ↗
  130. Hox genes ↗
  131. DOI: 10.1073/pnas.1312778110 ↗
  132. open text ↗
  133. DOI: 10.1111/pala.12732 ↗
  134. open text ↗
  135. Fortune Head GSSP ↗

Music

  • Meditation From The Star Orion
    OctahedronMusic · Envato Elements
Footage and image usage

Credits and usage times retained from the published edition or its production credit record. Where present, times identify visual appearances, not documentary chapters. Source and licence corrections are listed in the visual credits above.

  • Caixia Zhang et al. - 7:33-7:37
  • Caixia Zhang, Yu Liu, Javier Ortega-Hernandez, Joanna M. Wolfe, Changfei Jin, Huijuan Mai, Xianguang Hou, Jin Guo and Dayou Zhai - 7:31-7:33
  • Charles D. Walcott (photo by Brian Boyle) - 11:54-12:03, 12:03-12:08
  • Chen, A., Vannier, J., Guo, J., Wang, D., Gąsiorek, P., Han, J., Ma, W. - 7:57-8:03
  • Chip Clark - 15:00-15:07
  • Chris Woodrich - 16:14-16:20
  • Cédric Aria, Fangchen Zhao, Han Zeng, Jin Guo & Maoyan Zhu - 16:41-16:46
  • Diego Delso - 6:33-6:34
  • Dwergenpaartje - 7:29-7:31, 18:19-18:20
  • Farid Saleh​, Xiaoya Ma​, Pauline Guenser, M. Gabriela Mángano, Luis A. Buatois, Jonathan B. Antcliffe - 10:09-10:16
  • Gaëtan J.-M. Potin and Allison C. Daley - 8:45-8:53, 17:36-17:43
  • Ghedoghedo - 15:33-15:39
  • Giovanni Mussini, M. Paul Smith, Jakob Vinther, Imran A. Rahman, Duncan J.E. Murdock, David A.T. Harper, Frances S. Dunn - 15:07-15:13
  • Han Zeng - 13:12-13:15, 13:52-13:56, 15:39-15:45
  • Hans Hillewaert - 6:31-6:32
  • Ivar Leidus - 6:32-6:33
  • James St. John - 18:23-18:36
  • Jean Vannier - 15:45-15:52
  • Jean-Bernard Caron - 12:45-12:50, 15:52-15:57
  • Jessica Utrup - 8:22-8:26
  • Junnn11 - 13:15-13:18
  • Kcx36 - 9:36-9:41
  • Liam Herringshaw - 0:28-0:38, 2:24-2:33
  • Luo, M., Brock, G.A., Liang, Y., Song, B., Hu, Y., Liu, F. & Zhang, Z. - 4:27-4:32
  • Mark A. Wilson ( Wilson44691 ) (Department of Geology, The College of Wooster). [1] - 11:42-11:44
  • Martin R. Smith - 14:37-14:41, 18:18-18:19
  • Martin Smith - 2:33-2:38, 6:15-6:22, 18:20-18:23
  • Masahiro miyasaka - 4:46-4:50, 8:08-8:16
  • photochem_PA from State College, PA, USA - 6:30-6:31, 17:56-17:59
  • Russell D. C. Bicknell, Michel Schmidt, Imran A. Rahman, Gregory D. Edgecombe, Susana Gutarra, Allison C. Daley, Roland R. Melzer, Stephen Wroe and John R. Paterson - 17:01-17:08, 17:08-17:12
  • Russell D. C. Bicknell, Nicolas E. Campione, Glenn A. Brock and John R. Paterson - 18:50-18:58, 18:58-19:04
  • Smithsonian Institution Archives; photographer not identified - 12:14-12:21
  • Woudloper - 5:36-5:51, 6:41-6:56, 18:17-18:18
  • Custom animations and figures: From Cosmos to Civilization. Third-party material incorporated into animations is credited on the linked sources page.

How this film was made

Created and editorially directed by Anders Lunde using a custom production system developed over six months. AI assists research, drafting, programming, and visual production; I review and edit the material and make the final editorial decisions. Narration uses text-to-speech. Visuals combine custom-built scientific animations, AI-generated reconstructions, and credited scientific imagery.

Generated reconstructions illustrate scientific interpretations. They are distinct from photographs, specimens, and measured data.

More about the creator and production →