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DTSTAMP:20260129T094429
DTSTART;TZID=America/Detroit:20260211T090000
DTEND;TZID=America/Detroit:20260211T100000
SUMMARY:Lecture / Discussion:Lucas Gomes Dissertation Defense
DESCRIPTION:Past extinction events throughout Earth’s 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 “regional mass extinction” 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 (δ18Owater) is a useful tracer of the hydrological cycle and a critical parameter in carbonate-based (δ18Ocarb) paleotemperature studies. In Chapter 2\, I examine the controls on coastal δ18Owater variability along the U.S. Eastern Seaboard by mapping salinity–δ18Owater mixing relationships in estuaries from Maine to Florida. Relatively invariant marine δ18Owater signatures primarily track the prevailing coastal water mass\, while freshwater δ18Owater varies widely in response to regional gradients in precipitation (δ18Oprecip) signatures and evaporative intensity. Additional triple oxygen isotope (Δʹ17O) 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 δ18Owater compositions across this region and better interpret fossil δ18Ocarb 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’s paleoecological evolution over the past ~4 Myr. At Beeline Quarry (Chapter 4)\, I further apply clumped isotope (Δ47) thermometry to fossil shells to reconstruct water temperatures and δ18Owater compositions during deposition of the Nashua Fm. (Early Pleistocene) and Fort Thompson Fm. (Late Pleistocene). Surprisingly cool temperatures and depleted δ18Owater 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 Δ47 and Ba/Ca ratios\, respectively\, along the growth axes of fossil mollusk shells. The Δ47-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–Middle 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.
UID:144691-21895811@events.umich.edu
URL:https://events.umich.edu/event/144691
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Earth And Environmental Sciences
LOCATION:1100 North University Building - 2540
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20251215T165341
DTSTART;TZID=America/Detroit:20260211T090000
DTEND;TZID=America/Detroit:20260211T170000
SUMMARY:Exhibition:Lynn Galbreath Exhibition
DESCRIPTION:Lynn Galbreath\, a Detroit based artist who grew up in Argentina\, is a former recipient of the Creative Artists’ Grant from the Arts Foundation of Michigan and the Michigan Individual Artist Grant from Michigan Council For The Arts. Galbreath’s work has been showcased locally\, nationally and internationally in over 20 solo/two person and over 100 group exhibitions.\n\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 — 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’s Hospital of Michigan\, Pontiac Osteopathic Hospital and numerous private collections.\n\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’s artistic journey and concerns for the world.\n\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.\n\nOn the other hand\, Storyboard is a series of image-driven installation paintings that vary greatly in size\, showcasing Galbreath’s 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.\n\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.\n\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.
UID:142773-21891447@events.umich.edu
URL:https://events.umich.edu/event/142773
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Art,ArtsEngine,Culture,Detroit,Exhibition,Free,North Campus,Visual Arts
LOCATION:North Campus Research Complex Building 18 - Rotunda Gallery
CONTACT:
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