Speaker: Dr. Jessica Oster (Vanderbilt University, Department of Earth and Environmental Sciences)
Topic: Glacial and Deglacial Precipitation History of Western North America from Proxy Records and Paleoclimate Models
Abstract: In this presentation, I will discuss ongoing work to understand how the amount and source of precipitation varied in western North America over the past 35,000 years, including a new multi-proxy speleothem record from Lake Shasta Caverns in northern California. At 40.8°N, this cave is situated within the transition zone between regions in the northwestern and southwestern United States that demonstrate different precipitation responses to both modern and paleoclimatic drivers. This speleothem record demonstrates the non-stationarity of the transition zone location over the last glacial period and varied regional responses to Dansgaard-Oeschger events, Heinrich Events, and glacial interglacial changes. Covariation of speleothem ∂18O, an indicator of moisture source, with ∂13C and trace elements, indicators of moisture amount, allow separate investigation of how changes in moisture source and moisture amount influenced hydroclimate over this period. I will also describe initial results from a new study to understand the patterns and drivers of hydroclimatic change across the deglaciation using isotope-enabled climate models. This combined approach, using speleothem records and isotope-enabled climate models supports not only the reconstruction of past changes in atmospheric circulation, temperature, and precipitation but also the investigation of how these changes occurred and are recorded in paleoclimate archives.
February 12, 2020
Where: Mackay Science Room 321, UNR
Time: 4 PM–5 PM
Speaker:Dr. Neil Kelley (Vanderbilt University)
Topic: From Mountains to Museums—Piecing Together the History of Triassic Marine Reptiles in the American West
A message from Stacia Gordon: This coming Monday’s seminar speaker will be Dr. Neil Kelley from Vanderbilt University. Learn more about his research here at Earth Horizons and Vanderbilt University.
Abstract: The successful re-adaptation of terrestrial reptiles to aquatic life in the oceans after the end-Permian mass extinction coincided with top-to-bottom reorganization of marine ecosystems during the Mesozoic. Since the mid-1800s, the American West has been a rich source for fossils that record this pivotal evolutionary transition. Unfortunately, due to a combination of factors including fragmentary fossils, complex tectonics and remote localities, the American Triassic marine reptile fossil record has long been overshadowed by contemporaneous fossil assemblages from Europe and Asia. During the past several years, new discoveries in the field, as well as reappraisal of forgotten, misidentified or overlooked specimens in museum collections, have helped to fill in some gaps in our knowledge and reaffirm the important perspective provided by Triassic marine reptiles from the American West. This talk will review key historic and contemporary developments on this scientific frontier and explore what recent discoveries reveal about the evolution and extinction of Triassic marine reptiles and the ecological roles they played in an interval of global change.
UNR DGSE Geoscience Seminars Fall 2019 (Dept. of Geological Sciences & Engineering)
All regular Monday seminars are in DMS 102 at 4:00 PM.
Jonathan D. Bray, Ph.D., P.E.
NAE Faculty Chair in Earthquake Engineering Excellence, University of California, Berkeley
Estimating Liquefaction-Induced Building Settlement
Friday, November 22nd, 2019
12:00 – 1:30 p.m.
Earthquake Engineering Lab Auditorium at UNR
Gabriela González, LIGO Physicist
Einstein, Gravitational Waves, Black Holes and Other Matters
“Dr. Gabriela González is a physicist working on the
discovery of gravitational waves with the Laser Interferometer Gravitational-Wave
Observatory (LIGO) team, a collaboration of more than 1,000 scientists who
measured for the first time the gravitational waves that Einstein predicted
over 100 years ago.
González was born in Córdoba, Argentina, studied physics
at the University of Córdoba, and received her Ph.D. from Syracuse University.
She is currently a professor of physics and astronomy at Louisiana State
University. She has received awards from the American Physical Society, the
American Astronomical Society and the National Academy of Sciences.”
Read Nevada Today story (October 2, 2019) by Mike Wolterbeek.
Plankton Evolution: A Perspective from the Deep-Sea Microfossil Record
Dr. Dave Lazarus
Curator of Micropaleontology, Berlin Museum of Natural History (Museum für Naturkunde)
Monday, December 3
Davidson Math & Science Center (DMS, UNR) Room 105, 4:00 PM
Coffee and snacks will be provided at 3:30 PM.
Dr. Lazarus is one of the world’s leading micropaleontological researchers. He earned his PhD from Columbia University/Lamont Doherty Geological Observatory, and has gone on to publish extensively on the taxonomy and evolution of radiolarians, biostratigraphy, paleoceanography, and the applications of information technology to paleontology. Since 1996, he has been the curator of micropaleontology at the Berlin Museum of Natural History, where he conducts a wide variety of research related to fossil marine plankton.
A message from Philipp Ruprecht (Assistant Professor, Geological Sciences at UNR):
“Our speaker on Monday (10/22; social at 3:30 pm and talk at 4 pm in DMS 105) is Brandon Schmandt from the University of New Mexico. Brandon is a seismologist that has studied the Western US on the continental scale with EarthScope. He is interested in developing new tools that are resolving much finer scales within the Earth crust.”
Topic: Seismically Imaging Magma Reservoirs beneath Yellowstone and Long Valley Calderas
Speaker: Brandon Schmandt, Ph.D., Assistant Professor, University of New Mexico, Department of Earth and Planetary Sciences
Department of Geological Sciences and Engineering (DGSE)
2018 Fall Seminars—Tentative Fall Schedule:
All Regular Monday Seminars are in DMS 105.
Topic: Deep Life and Lessons from the Fringes of Microbial Biology
Speaker: Duane Moser, DRI
A message from Philipp Ruprecht (Assistant Professor, Geological Sciences, UNR):
Let me inform you that we have two more seminars this semester:
April 30—Roice Nelson, Jr. – Dynamic Measurement, LLC
Title: Lightning Analysis: Creating Geoframeworks
May 7—Daniela Pantosi (INGV, Italy) Slemmons Lecture
Title: The 2016 Earthquake Sequence in Central Italy: The Complexity of Normal Faults in Italy
Location: DMS 102 at University of Nevada, Reno (4 PM)