Rheotropic Epifaunal Growth, Not Felling by Density Currents, Is Responsible for Many Ediacaran Fossil Orientations at Mistaken Point

A new study challenges the prevailing explanation for fossil orientations at Mistaken Point. Contrary to the long-held belief that density currents toppled these ancient organisms, researchers propose that rheotropic epifaunal growth—where creatures align with water flow—is responsible for many of the observed positions. This finding reshapes our understanding of Ediacaran life and its interaction with environmental conditions. The study employed a combination of field observations, sedimentological analysis, and computational modeling to test hypotheses about fossil orientations, ultimately providing a more nuanced interpretation of this significant paleoenvironment.

McIlroy, D., Pérez-Pinedo, D., Pasinetti, G., McKean, C., Taylor, R. S., & Hiscott, R. N. (2022). Rheotropic Epifaunal Growth, Not Felling by Density Currents, Is Responsible for Many Ediacaran Fossil Orientations at Mistaken Point. Frontiers in Earth Science, 10. https://doi.org/10.3389/feart.2022.849194