Our 9th Webinar entitled “A review of Paleozoic evolution of Laurentia during the opening and closing of Iapetus and Rheic oceans” by Dr. Cees Van Staal was held by Zoom hosted by Colorado School of Mines on January 13th 2022. The number of participants was 58 professors and students from different countries (Canada; Morocco; USA; Spain; Algeria; India; Tunisia; China..).