Dear community, We cordially invite you to submit an abstract to GSA 2025 Session *T218: Paleozoic Tectonics of SW Laurentia Without Borders: Final Amalgamation of Pangea in the USA, Mexico, and South America.* This session explores the Paleozoic tectonic evolution of southwestern Laurentia during the final assembly of western Pangea, including Paleozoic tectonic belts in Gondwana. We welcome contributions that integrate stratigraphic, structural, geochronological, and magmatic records related to the final amalgamation of western Pangea and the transition to a Proto-Pacific subduction setting. We especially encourage submissions presenting research from Mexico and South America. *Invited speakers:* · Dr. Ryan Leary (New Mexico Tech) · Dr. Tim Lawton (UT Austin) *Endorsers: * · GSA International · American Association of Petroleum Geologists (AAPG) · Sociedad Geológica Mexicana *GSA Connects 2025* takes place in *San Antonio, Texas, 19-22 October*. The abstract submission deadline is *5 August 2025*. Link to submission portal: https://gsameetings.secure-platform.com/connects25 We look forward to your contributions and hope to see you in San Antonio. Best, Session advocates: Sandra Juárez-Zúñiga, Danny Stockli, Elisa Fitz-Díaz, Betania Palacios-García and Tyson Smith.