From eoas-seminar at lists.fsu.edu Fri May 1 13:37:30 2026 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 1 May 2026 17:37:30 +0000 Subject: [Eoas-seminar] Important pen and best picture In-Reply-To: References: Message-ID: Relatively important information from the building committee: When entering your preferred bathroom, you now may notice a clipboard mounted to one of the stalls. The sheet of paper on the clipboard allows you to communicate requests to the cleaning personnel, e.g. "out of bathroom paper" or "if you find an iphone in the toilet, please call XXX-YYYY?. This hopefully will help with hygiene and comfort in our bathrooms. For this to work, please leave the pen with the clipboard, although I acknowledge that it is a nice pen and very tempting. When waiting next to your preferred elevator, you may notice a clear acrylic sheet glued to the wall next to the elevator. This sheet is a sophisticated holder for a flyer. To operate this device, place the tip of a finger or two on the upper rim of the holder and pull the outer (!) pane of the device gently toward you, just far enough so that you can slide your announcements or cute cat picture into the holder. Pulling hard or a little farther will result in an extra acrylic sheet that you will have to hide for the rest of the day. Thanks to Michael and Alan for the installations! Markus On behalf of the building committee Dr. Markus Huettel Oceanography and Environmental Science Department of Earth, Ocean and Atmospheric Science Florida State University 1011 Academic Way, Tallahassee, FL, 32306-4520, USA Phone: +1 (850) 645-1394 Email: mhuettel at fsu.edu From eoas-seminar at lists.fsu.edu Fri May 1 22:00:48 2026 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Sat, 2 May 2026 02:00:48 +0000 Subject: [Eoas-seminar] MS Prospectus - Natalie Hammen Message-ID: Hi all, Please join us for Natalie Hammen's MS Prospectus on Monday, May 4th from 1-3pm in EOAS 5067. Name: Natalie Hammen Date: May 4th, 2026 Time: 1-3 pm Location: EOAS 5067 Major Advisor: Dr. Seth Young Title: Characterizing marine redox conditions in deep water facies of western Laurentia during the Middle-Late Ordovician Best, Adea Adea Arrison Sr. Academic Program Specialist Department of Earth, Ocean & Atmospheric Science [cid:image001.png at 01DCD9B5.F77B4070] -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.png Type: image/png Size: 3433 bytes Desc: image001.png URL: From eoas-seminar at lists.fsu.edu Mon May 4 09:58:21 2026 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Mon, 4 May 2026 13:58:21 +0000 Subject: [Eoas-seminar] MS Defense - Charlie Smith Message-ID: Good morning, Please join us for Charlie Smith?s Thesis Defense on Tuesday, May 5th at 1:00 PM (EST). Title: Local Expansion of Reducing Conditions During the Late Ordovician: Implications for the Great Ordovician Biodiversification Event Name: Charlie Smith Date: May 5th, 1:00 PM - 3:00 PM Location: EOA 5067 Major Professor: Dr. Jeremy Owens Zoom: https://fsu.zoom.us/j/93470688741 Abstract: The Great Ordovician Biodiversification Event (GOBE) was a transformative period for marine ecosystems. During this time familial diversity increased more than any other time in Earth?s history coinciding with an expansion and restructuring of marine ecosystems. The cause of this radiative event has been attributed to a multitude of biotic and abiotic factors which include the proliferation of phytoplankton, enhanced nutrient supply and a long-term global cooling event. Additionally, increased marine oxygenation has been proposed as a driver for many dynamic biotic events, with oxygenation improving metabolic conditions that may contribute to the global radiation. A range of redox proxies have been used to investigate shallow marine carbonate shelves; however significantly fewer studies have explored deep water settings. This study focuses on the Trail Creek Summit section of central Idaho which is a 200-meter-thick sequence of organic-rich mudstones with an interval thinly interbedded siltstone. This section contains the lower to upper Ordovician (Floian to Katian stages encompassing 470 to 449 Ma) using graptolite and conodont biostratigraphy in concert with carbon isotope chemostratigraphy. The Guttenberg Isotopic Carbon Excursion (GICE) is encountered during the bifidus biozone with a +2.6? ?13Corg (VPDB) excursion. A multiproxy approach was employed to better constrain the local redox conditions at Trail Creek Summit. Iron speciation supports the presence of persistently ferruginous, anoxic bottom waters with dissolved Fe. Depleted Mn concentrations throughout the section indicate the presence of manganese reduction. The D. caudatus biozone (Katian) shows enrichments up section in V and U alongside a moderate rise in Mo concentrations. Trace metal covariation suggests that the basin is not overly restricted and its general agreement with Fe speciation values lend evidence that enrichments are likely dependent on local redox conditions. Combined with the local Fe speciation suggests a migrating chemocline where porewaters near the sediment water interface transitioned from Fe reduction to sulfate reduction during the Katian. The ?34Spyr record shifts toward more positive values during this inferred rise in sulfate reduction which seems to correspond with published data for the marine sulfate record. Thus, this shift is likely a global record which can be attributed to a global increase in pyrite burial during the GICE which likely decreased the size of the marine sulfate reservoir. In context of the GOBE, locally this basin was consistently anoxic at least near the sediment water interface although there is record of sedimentary bioturbation, but importantly is locally more reducing near the sediment water interface by the Katian and was probably inhospitable for most infaunal and benthic animals. Local redox conditions provide a framework for future work on other global redox proxies that will provide global insight into this highly dynamic period for marine life. Adea Arrison Sr. Academic Program Specialist Department of Earth, Ocean & Atmospheric Science [cid:image001.png at 01DCDBAC.895CA400] -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.png Type: image/png Size: 3433 bytes Desc: image001.png URL: From eoas-seminar at lists.fsu.edu Fri May 1 17:08:37 2026 From: eoas-seminar at lists.fsu.edu (eoas-seminar at lists.fsu.edu) Date: Fri, 1 May 2026 21:08:37 +0000 Subject: [Eoas-seminar] Thesis Defense - Smith In-Reply-To: References: Message-ID: Please join us for Charlie Smith?s Thesis Defense on Tuesday, May 5th at 1:00 PM (EST). Title: Local Expansion of Reducing Conditions During the Late Ordovician: Implications for the Great Ordovician Biodiversification Event Name: Charlie Smith Date: May 5th, 1:00 PM - 3:00 PM Location: EOA 5067 Major Professor: Dr. Jeremy Owens Zoom: https://fsu.zoom.us/j/93470688741 Abstract: The Great Ordovician Biodiversification Event (GOBE) was a transformative period for marine ecosystems. During this time familial diversity increased more than any other time in Earth?s history coinciding with an expansion and restructuring of marine ecosystems. The cause of this radiative event has been attributed to a multitude of biotic and abiotic factors which include the proliferation of phytoplankton, enhanced nutrient supply and a long-term global cooling event. Additionally, increased marine oxygenation has been proposed as a driver for many dynamic biotic events, with oxygenation improving metabolic conditions that may contribute to the global radiation. A range of redox proxies have been used to investigate shallow marine carbonate shelves; however significantly fewer studies have explored deep water settings. This study focuses on the Trail Creek Summit section of central Idaho which is a 200-meter-thick sequence of organic-rich mudstones with an interval thinly interbedded siltstone. This section contains the lower to upper Ordovician (Floian to Katian stages encompassing 470 to 449 Ma) using graptolite and conodont biostratigraphy in concert with carbon isotope chemostratigraphy. The Guttenberg Isotopic Carbon Excursion (GICE) is encountered during the bifidus biozone with a +2.6? ?13Corg (VPDB) excursion. A multiproxy approach was employed to better constrain the local redox conditions at Trail Creek Summit. Iron speciation supports the presence of persistently ferruginous, anoxic bottom waters with dissolved Fe. Depleted Mn concentrations throughout the section indicate the presence of manganese reduction. The D. caudatus biozone (Katian) shows enrichments up section in V and U alongside a moderate rise in Mo concentrations. Trace metal covariation suggests that the basin is not overly restricted and its general agreement with Fe speciation values lend evidence that enrichments are likely dependent on local redox conditions. Combined with the local Fe speciation suggests a migrating chemocline where porewaters near the sediment water interface transitioned from Fe reduction to sulfate reduction during the Katian. The ?34Spyr record shifts toward more positive values during this inferred rise in sulfate reduction which seems to correspond with published data for the marine sulfate record. Thus, this shift is likely a global record which can be attributed to a global increase in pyrite burial during the GICE which likely decreased the size of the marine sulfate reservoir. In context of the GOBE, locally this basin was consistently anoxic at least near the sediment water interface although there is record of sedimentary bioturbation, but importantly is locally more reducing near the sediment water interface by the Katian and was probably inhospitable for most infaunal and benthic animals. Local redox conditions provide a framework for future work on other global redox proxies that will provide global insight into this highly dynamic period for marine life. -------------- next part -------------- An HTML attachment was scrubbed... URL: