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DTSTART:20200308T020000
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UID:calendar.22180.field_date_time.0@www.umces.edu
DTSTAMP:20260421T002009Z
CREATED:20200923T210219Z
DESCRIPTION:September 30\, 2020 3:30pm    \n    \n      \n\n\n    \n\n     
          \nChesapeake Biological Laboratory\n      \n\n\n\n\n  \n\n    \n
 \n              \n\n\n        Topic: The Alabama Underwater Forest: A Time
  Capsule from the Last Ice Age\n        \n\n    \n\n              \n\n\nAB
 STRACT: Approximately 13 km south of Gulf Shores\, Alabama (United States)
 \, divers found in situ baldcypress (Taxodium distichum) stumps 18 m below
  the ocean surface. These trees could have only lived when sea level fell 
 during the Pleistocene subaerially exposing the tectonically stable contin
 ental shelf. Here we investigate the geophysical properties along with mic
 rofossil and stratigraphic analyses of sediment cores to understand the fa
 ctors that lead to this wood’s preservation. The stumps are exposed in an 
 elongated depression (~100 m long\, ~1 m deep) nested in a trough of the n
 orthwest-southeast trending Holocene sand ridges and troughs with 2–5 m ve
 rtical relief and ~0.5 km wavelength. Radiocarbon ages of the wood were in
 finite thus optically stimulated luminescence (OSL) dating was used to con
 strain the site’s age. Below the Holocene sands (~0.1–4 m deep)\, separate
 d by a sequence boundary\, are Late Pleistocene mud-peat (72±8 ka OSL)\, m
 ud-sand (63±5\, 73±6 ka OSL)\, and palaeosol (56±5 ka OSL) facies that gra
 de laterally from west to east\, respectively. Foraminiferal analysis reve
 als the location of the terrestrial-marine transitional layer above the Pl
 eistocene facies in an interbedded sand and mud facies (3940±30 (1σ) 14C a
  BP)\, which is part of a lower shoreface or marine-dominated estuarine en
 vironment. The occurrence of palaeosol and swamp facies of broadly similar
  ages and elevation suggests the glacial landscape possessed topographic r
 elief that allowed wood\, mud\, and peats to be preserved for ~50 ka of su
 baerial exposure before transitioning to the modern marine environment. We
  hypothesize that rapid sea level rise occurring ~60 ka or ~40 ka provided
  opportunities for local floodplain aggradation to bury the swamp thus pre
 serving the stumps\, and that other sites may exist in the northern Gulf o
 f Mexico shelf.\n\n\n\nJoin Zoom Meeting https://zoom.us/j/96105792609?pwd
 =QmhwUGpMQ3ZPWGFoT2MzRzFaclM5QT09\n\n\n\nMeeting ID: 961 0579 2609\n\n\n\n
 Passcode: 1925\n\n\n\nOne tap mobile +13017158592\n\n\n\nCBL's Distinguish
 ed Scholars Seminar is open to the public. However\, interested participan
 ts should be aware that these highly technical seminars are intended for a
 n academic audience. Members of the public who would like to learn about f
 eatured research efforts are encouraged to participate in CBL's public Sci
 ence for Citizens Seminar Series.
DTSTART;TZID=America/New_York:20200930T153000
DTEND;TZID=America/New_York:20200930T153000
LAST-MODIFIED:20200930T181726Z
SUMMARY:Distinguished Scholar Seminar Series: Dr. Kristine Delong (Louisian
 a State University)
URL;TYPE=URI:https://www.umces.edu/events/distinguished-scholar-seminar-ser
 ies-dr-kristine-delong-louisiana-state-university
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