Schaper, C. 2026. Geometric Origin of the Photosynthetic Macrocycle: Dual-Chrysene Cage Rearrangement, 18 pi-Electron Conservation, and the 1.1 Ga Geoporphyrin Record. Annals of the Chrysene Formalism. 1, 1 (Sep. 2026), 233–247. DOI:https://doi.org/10.68366/p1ykdx38.