{ "134855-21895920": { "datetime_modified":"20260224T144435", "datetime_start":"20260211T090000", "datetime_end":"20260211T100000", "has_end_time":1, "date_start":"2026-02-11", "date_end":"2026-02-11", "time_start":"09:00:00", "time_end":"10:00:00", "time_zone":"America\/Detroit", "event_title":"Chair Aerobics\/Stretch, Strength & Balance\/Zumba", "occurrence_title":"", "combined_title":"Chair Aerobics\/Stretch, Strength & Balance\/Zumba", "event_subtitle":"", "event_type":"Exercise \/ Fitness", "event_type_id":"6", "description":"Lifetime Fitness classes are offered at Briarwood Mall in the JCPenney wing every Monday-Friday from 9-10am. No experience necessary. Classes are specifically designed for older adults, however, everyone is welcome. LTF classes are free, but please consider making a $2\/person per class donation as our classes are supported strictly through donations. No registration is necessary, simply attend when it fits your schedule.", "occurrence_notes":"LTF classes are held in the court near JCPenney, Monday through Friday", "guid":"134855-21895920@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/134855", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Briarwood Mall", "has_livestream":0, "cost":"", "tags":["fitness","Health & Wellness"], "website":"https:\/\/www.kines.umich.edu\/about\/community-programs\/lifetime-fitness", "sponsors":[ { "group_name":"Kinesiology Community Programs", "group_id":"1192", "website":"https:\/\/www.kines.umich.edu\/about\/community-programs" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/04\/event_134855_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/04\/event_134855_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/04\/event_134855_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/04\/event_134855_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/04\/event_134855_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/04\/event_134855_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/04\/event_134855_original-1.png" }, "occurrence_count":172, "first_occurrence":21875405 } , "144691-21895811": { "datetime_modified":"20260129T094429", "datetime_start":"20260211T090000", "datetime_end":"20260211T100000", "has_end_time":1, "date_start":"2026-02-11", "date_end":"2026-02-11", "time_start":"09:00:00", "time_end":"10:00:00", "time_zone":"America\/Detroit", "event_title":"Lucas Gomes Dissertation Defense", "occurrence_title":"", "combined_title":"Lucas Gomes Dissertation Defense: Extinction and Environmental Change on the Plio-Pleistocene Florida Platform: Insights from Clumped Isotopic and Trace Elemental Sclerochronology", "event_subtitle":"Extinction and Environmental Change on the Plio-Pleistocene Florida Platform: Insights from Clumped Isotopic and Trace Elemental Sclerochronology", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Past extinction events throughout Earth\u2019s history have arisen during periods of major environmental change, offering unique lessons about how ecosystems function and respond to environmental pressures. By studying the environmental mechanisms that forced extinction and ecological change in the geologic record, we can better prepare for and mitigate biodiversity loss in the face of present-day global environmental crises. Shallow marine ecosystems on the Florida Platform underwent a dramatic transformation over the past ~4 million years, part of a \u201cregional mass extinction\u201d documented broadly around the Plio-Pleistocene West Atlantic. In this dissertation, I resolve major gaps in the marine environmental record of the Plio-Pleistocene Florida Platform using stratigraphic, paleontological, and geochemical approaches, enabling clearer evaluation of the environmental perturbations responsible for this regional extinction event.\n\nThe oxygen isotope composition of water (\u03b418Owater) is a useful tracer of the hydrological cycle and a critical parameter in carbonate-based (\u03b418Ocarb) paleotemperature studies. In Chapter 2, I examine the controls on coastal \u03b418Owater variability along the U.S. Eastern Seaboard by mapping salinity\u2013\u03b418Owater mixing relationships in estuaries from Maine to Florida. Relatively invariant marine \u03b418Owater signatures primarily track the prevailing coastal water mass, while freshwater \u03b418Owater varies widely in response to regional gradients in precipitation (\u03b418Oprecip) signatures and evaporative intensity. Additional triple oxygen isotope (\u0394\u037417O) measurements of Florida river waters indicate a remarkable degree of evaporative isotope enrichment. This modern isotopic framework can be used to constrain assumptions about ancient \u03b418Owater compositions across this region and better interpret fossil \u03b418Ocarb records from coastal marine paleoenvironments.\n\nIn Chapters 3 and 4, I present two new study sites containing fossil-rich Plio-Pleistocene sedimentary exposures in southwest (Florida Shell Quarry) and eastern Florida (Beeline Quarry), respectively. Detailed lithostratigraphic and biostratigraphic characterization through each of these sections enable the detailed reconstruction of local depositional paleoenvironments and relative sea-level fluctuations. The development of these new sections and their careful integration within the historical Plio-Pleistocene stratigraphic framework of peninsular Florida establishes a foundation for renewed study of Florida\u2019s paleoecological evolution over the past ~4 Myr. At Beeline Quarry (Chapter 4), I further apply clumped isotope (\u039447) thermometry to fossil shells to reconstruct water temperatures and \u03b418Owater compositions during deposition of the Nashua Fm. (Early Pleistocene) and Fort Thompson Fm. (Late Pleistocene). Surprisingly cool temperatures and depleted \u03b418Owater values in both units relative to modern coastal waters likely reflect persistent influence of submarine groundwater discharge along the Atlantic Coast of Florida.\n\nIn Chapter 5, I reconstruct parallel records of marine climates and planktonic productivity across the six major Plio-Pleistocene formations of southwest Florida and use them to evaluate longstanding hypotheses that the regional extinction event was driven by (i) cooling marine climates and\/or (ii) declining primary production. Marine climate seasonality and planktonic productivity were quantified by measuring \u039447 and Ba\/Ca ratios, respectively, along the growth axes of fossil mollusk shells. The \u039447-temperature record reveals that remarkably cool Pliocene marine climates (similar to present-day North Carolina) warmed rapidly in the Early Pleistocene, directly contradicting earlier cooling hypotheses and suggesting that rapid warming may have instead contributed to faunal turnover. Independently, the Ba\/Ca-derived productivity record indicates that high productivity persisted until the Early\u2013Middle Pleistocene, after which it collapsed, broadly supporting the productivity-driven extinction hypothesis. Altogether, this work greatly refines our understanding of the co-evolution of life and environments on the Plio-Pleistocene Florida Platform.", "occurrence_notes":null, "guid":"144691-21895811@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144691", "building_id":"1000188", "building_name":"1100 North University Building", "campus_maps_id":"628", "room":"2540", "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_144691_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/event_144691_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_144691_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21895811 } }