{ "143177-21892393": { "datetime_modified":"20260105T133159", "datetime_start":"20260123T153000", "datetime_end":"20260123T163000", "has_end_time":1, "date_start":"2026-01-23", "date_end":"2026-01-23", "time_start":"15:30:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Van der Voo Lecture: David Evans", "occurrence_title":"", "combined_title":"Van der Voo Lecture: David Evans: Finding Supercontinents in the Abyss of Time", "event_subtitle":"Finding Supercontinents in the Abyss of Time", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Mobility of tectonic plates has resulted in amalgamations of supercontinents every ~700 million years for at least the latter half of Earth history. Prior to Pangea (300-150 Ma), the preceding giant landmasses of Rodinia (1000-700 Ma) and Nuna (1600-1300 Ma) have been increasingly resolved in recent years by the combined efforts of chronostratigraphy, paleomagnetism, and kinematic synthesis. An earlier supercontinent Kenorland (ca. 2600-2200 Ma) has been postulated but heretofore only visualized in general aspects. As reconstructions progress deeper in time, one must be increasingly cautious of standard assumptions such as an axial-dipolar geomagnetic field, the total inventory of continental crust, and even whether plate tectonics existed. Mindful of these caveats, I present a viable kinematic model of Kenorland\u2019s assembly, tenure, and breakup through the Archean-Proterozoic interval that also witnessed the Great Oxidation Event, possible Snowball Earth ice ages, and eukaryotic development.", "occurrence_notes":null, "guid":"143177-21892393@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143177", "building_id":"1000188", "building_name":"1100 North University Building", "campus_maps_id":"628", "room":"1528", "location_name":"1100 North University Building", "has_livestream":0, "cost":"", "tags":["Earth And Environmental Sciences"], "website":"", "sponsors":[ { "group_name":"Earth and Environmental Sciences", "group_id":"3170", "website":"http:\/\/www.lsa.umich.edu\/earth" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/01\/event_143177_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_143177_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21892393 } , "144094-21894646": { "datetime_modified":"20260118T170801", "datetime_start":"20260123T160000", "datetime_end":"20260123T170000", "has_end_time":1, "date_start":"2026-01-23", "date_end":"2026-01-23", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Learning Seminar: Matroids and the integral Hodge conjecture", "occurrence_title":"", "combined_title":"Algebraic Geometry Learning Seminar: Matroids and the integral Hodge conjecture: Alex Perry", "event_subtitle":"Alex Perry", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Intro lecture and organizational meeting for a learning seminar on the paper https:\/\/arxiv.org\/abs\/2507.15704", "occurrence_notes":null, "guid":"144094-21894646@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144094", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Algebraic Geometry Learning Seminar- Department of Mathematics", "group_id":"5295", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21894646 } }