139 Evolution of Life in the Cambrian Seas: Biotic, Biogeochemical, and Sedimentological Contexts, Part II

This session is dedicated to studies that illuminate the biotic, geobiological, sedimentological, and geochemical contexts of the evolution of early animal life in the oceans, with a particular focus on the Cambrian Period.

Monday, 20 October 2025
1:30 PM - 5:30 PM
HBGCC, 304B

Participants

• Chair Rudy Lerosey-Aubril
• Chair Robert Gaines
• Chair Javier Ortega-Hernandez
• Chair Lidya Tarhan

Presentations

• 1:35 PM
  Cambrian Burgess Shale-type Lagerstatten: Chengjiang and Qingjiang biotas
  Xingliang Zhang, Northwest University, Xian, Shaanxi
  414781 (Technical Sessions)
• 1:50 PM
  Understanding Stratigraphic Controls on Fossil Preservation in the Middle Cambrian of Montana
  Hunter Olson, Stanford University, Palo Alto, CA and Pedro Monarrez, Virginia Tech, Blacksburg, VA and Erik Sperling, Stanford University, Stanford, CA
  414759 (Technical Sessions)
• 2:05 PM
  The setting of the Burgess Shale at Marble Canyon
  Robert Gaines, Pomona College, Claremont, CA and Alexander Lombardo, UC Davis, Carlsbad, CA and Michael Streng, University of Uppsala, Uppsala and Jean-Bernard Caron, Royal Ontario Museum, Toronto, ON
  414706 (Technical Sessions)
• 2:20 PM
  Convergent Taphonomies Mask Diversity in an early Cambrian Assemblage in southwestern Mongolia
  Prescott Vayda, Virginia Tech, Blacksburg, VA and Shuhai Xiao, Virginia Tech, Blacksburg, VA and Emily Smith, Johns Hopkins University, Baltimore, MD and Erdenebulgen Dorjden, National University of Mongolia, Ulaanbaatar and Tamjid Batochir, Mongolian University of Science and Technology, Ulaanbaatar and Mary Lonsdale, Johns Hopkins University, Baltimore, MD and Watsawan Chanchai, Penn State University, University Park, PA
  414738 (Technical Sessions)
• 2:35 PM
  Uncovering Bias in Acid Maceration of Cambrian Small Shelly Fauna
  Clare Mate, University of Missouri, Columbia, Missouri and Sarah Jacquet, University of Missouri, Columbia, Missouri
  413597 (Technical Sessions)
• 3:10 PM
  Predator or scavenger? Hallucigenia illuminates the ecology of Cambrian lobopodians
  Javier Ortega-Hernández, Museum of Comparative Zoology and Department of Organismic and Evolutionary Biology, Cambridge, MA
  413009 (Technical Sessions)
• 3:25 PM
  A hypersegmented Kylinxia-like Arthropod from the middle Cambrian Marjum Formation (Utah): Insights into arthropod early Evolution and Phylogeny
  Rudy Lerosey-Aubril, Harvard University, Cambridge, MA and Jacob Skabelund, Not affiliated, Wellsville, Utah and Javier Ortega-Hernandez, Harvard University, Cambridge, MA
  412981 (Technical Sessions)
• 3:40 PM
  Cambrian Euarthropod Urokodia aequalis Sheds Light on The Origin of Artiopoda Body Plan
  Cong Liu, Northwest University, Shaanxi and Dongjing Fu, Northwest University, Shaanxi and Yu Wu, Northwest University, Shaanxi and Xingliang Zhang, Northwest University, Shaanxi
  412548 (Technical Sessions)
• 3:55 PM
  Quantification of trilobite exopodite surface area through 3D modelling supports a respiratory function
  Sarah Losso, Harvard University, Cambridge, MMA and Federica Vallefuoco, University of Naples Federico II,, Naples and Igino Foglia, University of Naples Federico II, Naples and Léo Laborieux, University of Montpellier, Montpellier and Ana Belén Muñoz-García, University of Naples Federico II, University of Naples Federico II and Javier Ortega-Hernández, Harvard University, Cambridge, MA
  412988 (Technical Sessions)
• 4:10 PM
  Microevolutionary trajectories in the late Cambrian complex trilobite species Dikelocephalus minnesotensis
  Ernesto Vargas-Parra, University of California Riverside, Riverside, CA and Shravya Srivastava, Sam Houston State University, Huntsville, TX and Anthony Runkel, Minnesota Geological Survey, St. Paul, MN and Nigel Hughes, University of California Riverside, Riverside, CA
  413561 (Technical Sessions)