{ "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 } , "142773-21891447": { "datetime_modified":"20251215T165341", "datetime_start":"20260211T090000", "datetime_end":"20260211T170000", "has_end_time":1, "date_start":"2026-02-11", "date_end":"2026-02-11", "time_start":"09:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Lynn Galbreath Exhibition", "occurrence_title":"", "combined_title":"Lynn Galbreath Exhibition: Twenty-two paintings from the series \u201cTelegraph\u201d, \u201cWorking Hard For A Living\u201d, and Storyboard\u201d", "event_subtitle":"Twenty-two paintings from the series \u201cTelegraph\u201d, \u201cWorking Hard For A Living\u201d, and Storyboard\u201d", "event_type":"Exhibition", "event_type_id":"7", "description":"Lynn Galbreath, a Detroit based artist who grew up in Argentina, is a former recipient of the Creative Artists\u2019 Grant from the Arts Foundation of Michigan and the Michigan Individual Artist Grant from Michigan Council For The Arts. Galbreath\u2019s work has been showcased locally, nationally and internationally in over 20 solo\/two person and over 100 group exhibitions.\r\n\r\nGalbreath has an M.F.A. from the James Pearson Duffy Department of Art, Art History, & Design, Wayne State University, Detroit, MI; and a B.F.A. with Permanent K-12 Certification from The Gwen Frostic School of Art, Western MI University, Kalamazoo, MI. Galbreath has chaperoned eleven intensive, immersive art experiences to Italy, Spain, France, Belgium, England, Germany, the Netherlands, Austria, and the Czech Republic. Lynn is a retired Adjunct Associate Professor of Studio Art from Oakland University, where she has been on the faculty of the Department of Art & Art History since 2000. Lynn has also instructed studio art and design at the College For Creative Studies, University of Detroit Mercy \u2014 School of Architecture, Macomb Community College, Wayne State University, and Bloomfield University School. Her work can be seen in the collections of Oakland University, Wayne State University, Detroit Receiving Hospital, Children\u2019s Hospital of Michigan, Pontiac Osteopathic Hospital and numerous private collections.\r\n\r\nThis exhibition consists of works from a variety of series created by Galbreath over the years: Telegraph, Storyboard, and Working Hard for a Living. Each series represents a unique exploration of themes, techniques, and social commentaries that reflect Galbreath\u2019s artistic journey and concerns for the world.\r\n\r\nTelegraph explores the aesthetic visual weights and balances between harmony and content, diving deep into how visual elements can convey messages and emotions. This series invites viewers to reflect on the way art communicates through its formal qualities, as well as its narrative possibilities. The careful interplay of shapes, colors, and textures in these works prompts an examination of the viewer's perception and emotional response. By utilizing abstract forms, Galbreath encourages an engagement that goes beyond mere observation, seeking to provoke thought about how aesthetic choices influence understanding and meaning.\r\n\r\nOn the other hand, Storyboard is a series of image-driven installation paintings that vary greatly in size, showcasing Galbreath\u2019s versatility and creative ingenuity. The titles of the works draw inspiration from the years spent creating visuals for TV commercials and public service announcements, illustrating how commercial art often intertwines with societal messages. This series emphasizes the profound impact visual narratives have on consumer culture and public perception, underscoring the artist's belief in the potency of imagery to shape narratives. The installations weave a complex fabric of storytelling that challenges viewers to reconsider their relationship with media and the messages they consume daily.\r\n\r\nWorking Hard for a Living pays tribute to our sustainable and unsustainable resources, shedding light on the individuals who toil diligently within these economic frameworks. This series highlights the hard-working suppliers of essential products, including Farm Market Managers, Fishmongers, and Beach Vendors. By portraying these self-employed individuals, often operating within informal economies, Galbreath draws attention to the unique challenges they face. These individuals frequently contend with low, inconsistent incomes, long hours, and sometimes exploitative conditions, fostering a sense of solidarity with those who labor under such circumstances.\r\n\r\nFurthermore, the series invites viewers to confront the broader societal structures that contribute to these inequities. Galbreath's work serves not only as a tribute but also as a call to action to consider how our consumer habits and economic policies affect the livelihoods of others. The layered narratives present in this series open a dialogue about the value we place on labor and the often unseen struggles that support our day-to-day lives. Through these explorations, Galbreath establishes a multifaceted narrative that intertwines art with activism, compelling audiences to engage both aesthetically and ethically with the realities depicted in the exhibition.", "occurrence_notes":"Hours Mon-Fri 9 am to 5 pm or by appointment (serrag@med.umich.edu)", "guid":"142773-21891447@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/142773", "building_id":"0", "building_name":"North Campus Research Complex Building 18", "campus_maps_id":"595", "room":"Rotunda Gallery", "location_name":"North Campus Research Complex Building 18", "has_livestream":0, "cost":"", "tags":["Art","ArtsEngine","Culture","Detroit","Exhibition","Free","North Campus","Visual Arts"], "website":"", "sponsors":[ { "group_name":"North Campus Research Complex NCRC Art Program", "group_id":"5062", "website":"https:\/\/ncrc.umich.edu\/life-ncrc\/occupant-amenities\/art-program" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/12\/event_142773_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/12\/event_142773_original-1.jpg" }, "occurrence_count":59, "first_occurrence":21891438 } }