Personnel

Who are we?

ec_flag-smaller.jpgThe DAGGER (Devonian Anoxia, Geochemistry, Geochronology, and Extinction Research) team consists of paleontologists, stratigraphers, sedimentary and isotope geochemists, sedimentologists, and structural geologists. 

Dr. Sarah Carmichael and Dr. Johnny Waters of the Department of Geological and Environmental Sciences at Appalachian State University created the DAGGER group in 2015 as an offshoot of the IGCP 596 program to 1) include additional scientists from other disciplines of the geosciences, 2) include science communicators and outreach specialists, and 3) formally include undergraduate researchers as team members.

DAGGER Team Leaders

The DAGGER Team Leaders are responsible for funding and organizing field expeditions,  as well as facilitating multidisciplinary collaborations across different projects.

 

  • Dr. Sarah Carmichael

    Dr. Sarah Carmichael is a Professor of Geological and Environmental Sciences at Appalachian State University. She is a geochemist who specializes in fluid-rock reactions in both ancient and modern environments. 

    Website

    photo by Felix Kunze

  • Dr. Erika Kido

    Dr. Erika Kido is a paleontologist at the University of Graz, Austria and a co-leader of IGCP 596. She is an expert on Palaeozoic corals.

  • Dr. Peter K√∂nigshof

    Dr. Peter Königshof leads the IGCP 596 Project. He is a conodont biostratigrapher as well as a sedimentologist, with particular expertise in microfacies analysis. He is the head of the Senckenberg Research Institute and Natural History Museum in Frankfurt, Germany.

    Website

    photo by Felix Kunze

  • Dr. Thomas Suttner

    Dr. Thomas Suttner is a stratigrapher at the University of Graz, Austria and is a co-leader of IGCP 596. He specializes in conodont biostratigraphy and Devonian reefs.

    Website

  • Dr. Johnny Waters

    Johnny Waters is a paleontologist and Emeritus Professor at Appalachian State University, whose research interests include rebound from mass extinctions, Paleozoic community evolution, and the taxonomy, functional morphology, ontogeny and paleoecology of paleozoic echinoderms, especially blastoids.  He was a co-leader of the IGCP 596 team.

    Website

    photo by Felix Kunze

DAGGER Affiliated Scientists

The DAGGER Affiliated Scientists represent a variety of disciplines, and all collaborate with the team leaders on DAGGER projects.

 

  • Dr. Yarinpil Ariunchimeg

    Dr. Yarinpil Ariunchimeg is a bryozoan paleontologist and biostratigrapher with the Palaeontological Centre, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia, and a member of the IGCP 596 team. She and Dr. Sersmaa Gonchigdorj oversee all Mongolian fieldwork and sample collection associated with DAGGER projects.

    Website

    photo by Felix Kunze

  • Dr. Diana Boyer

    Dr. Diana Boyer is a Professor of Geology at Winthrop University.  She is a paleoecologist who uses tools such as trace fossil and inorganic geochemistry to understand ancient depositional conditions.

  • Dr. Phoebe Cohen

    Dr. Phoebe Cohen is a paleobiologist at Williams College. Her expertise is on Paleozoic organic walled microfossils, which she uses to study evolution, extinctions and changing ecosystem dynamics.

    Website

  • Dr. Drew Coleman

    Dr. Drew Coleman is an isotope geochemist at the University of North Carolina at Chapel Hill. He is primarily works with igneous rocks but is helping the group age date Devonian sediments and lava flows using a variety of techniques.

    Website

  • Dr. David De Vleeschouwer

    Dr. David De Vleesschouwer is a cyclostratigrapher at the Universität Bremen (MARUM group) and a member of IGCP 580 (Application of Magnetic Susceptibility on Palaeozoic Sedimentary Rocks).  He specializes in the role of orbital forcing on Late Devonian anoxia/extinction events.

    Website 

  • Dr. Cole Edwards

    Dr. Cole Edwards is a carbonate sedimentologist at Appalachian State University. He specializes in stable isotope signatures preserved in Ordovician and Devonian sediments.

    Website

  • Dr. Sersmaa Gonchigdorj

    Dr. Sersmaa Gonchigdorj is a geologist with the Mongolian University of Science and Technology in Ulaanbaatar, Mongolia, and a member of the IGCP 596 team.  She and Dr. Yarinpil Ariunchimeg oversee all Mongolian fieldwork and sample collection associated with this project.

DAGGER Science Communicators

The DAGGER Science Communication team is responsible for the group's social media presence, field photography, educational outreach, and telling the Devonian extinction and recovery story to a broader audience than just geoscientists.

 

  • Ryan Fernandez

    Ryan is a portrait photographer whose medium is film photography rather than digital photography. The DAGGER team welcomed Ryan (and his 100+ film canisters) on their National Geographic and Explorers Club Flag Expedition to Mongolia in 2018. His work can be seen at http://ryanmikail.com

    Photo by Felix Kunze

  • Felix Kunze

    Felix Kunze is a photographer and lighting expert who has worked in remote and challenging locations all over the world, including Mongolia, Iceland, Namibia, and caves in the southern Appalachians.  He is one of the Explorers Club portrait photographers, and is currently working on a project wherein he takes formal portraits of scientists in their field sites.  The DAGGER team welcomed Felix on their National Geographic and Explorers Club Flag Expedition to Mongolia in 2018; his role was to tell a "behind the scenes" story of scientists in the field in an interesting, honest, and respectful way.  His work can be seen at http://felixkunze.com.

  • Marta Toran

    Marta Toran is the outreach coordinator for the Department of Geological and Environmental Sciences at Appalachian State University. She works tirelessly to engage K-12 students and the public in earth science research. She is developing Next Generation Science Standards modules based on DAGGER team projects.

    Website

DAGGER Student Collaborators

Undergraduate students are an integral part of the work done for the DAGGER project.

To see samples of some of our undergraduate's work, click on Student Work

 

DAGGER Student Team (current)

  • Kathleen Duckett

    Katie is helping to determine the ages of volcanic ash in southwestern Mongolia using zircon geochronology.

  • Alex Zacher

    Alex is a new member of the team who will be working to characterize the carbonate sedimentology and do a statistical analysis of pyrite framboid distributions from Late Devonian sediments in Belgium.

DAGGER Student Team (past)

  • Kaitlyn Anthony

    As a summer research assistant through the Smoky Mountain STEM program, Kait spent the summer of 2019 determining the level of anoxia at a variety of sites in the Hongguleleng Formation in northwestern China.  She will begin her college career in 2020.

  • Cameron Batchelor

    Cameron worked on a geochemical study of the Late Devonian mass extinction, using 87Sr/86Sr measurements to provide information about depositional setting and diagenesis, and looking for zircons in sediments and lava flows to help constrain biostratigraphic ages. When she was not on the scanning electron microscope at Appalachian, she was working in the Geochronology and Isotope Geochemistry lab run by Dr. Drew Coleman at UNC-Chapel Hill.  Cameron is currently at the University of Wisconsin working on her Ph.D. in isotope geochemistry. Cameron's fieldwork, stable isotope analyses, and zircon geochronology work during her time at Appalachian has resulted in the following publications (with more on the way):

    Carmichael, S.K., Waters, J.A., *Batchelor, C.J., Coleman, D., Suttner, T.J., Kido, E., *Moore, L.M., and Chadimova, L., 2016, Climate instability and tipping points in the Late Devonian: Detection of the Hangenberg Event in an open oceanic island arc in the Central Asian Orogenic Belt, Gondwana Research v. 32, p. 213-231 (doi:10.1016/j.gr.2015.02.009).

    Suttner, Thomas J., Kido, Erika, Ariunchimeg, Yarinpil, Sersmaa, Gonchigdorj, Waters, Johnny A., Carmichael, Sarah K., *Batchelor, Cameron J., *Ariuntogos, Munkhjargal, *Hušková, Aneta, Slavik, Ladislav, Valenzuela-Ríos, José I., Liao, Jau-Chyn, and Gatovsky, Yury A., 2019, Conodonts from Late Devonian island arc settings (Baruunhuurai Terrane, western Mongolia), Palaeogeography, Palaeoclimatology, Palaeoecology (DOI: 10.1016/j.palaeo.2019.03.001)

    (Ph.D. in progress, University of Wisconsin-Madison; B.S. 2015, Appalachian State University)

  • Aubry DeReuil

    Aubry's undergraduate senior thesis "Sedimentation, Geochemistry, and Mineralogy across the Frasnian-Fammenian Boundary, northwestern China" was an important contribution to one of the first DAGGER projects. Aubry recognized that the size distribution of framboidal pyrite can be used to determine the extent and severity of ocean anoxia in sediments that are not black shales, which was published in: 

    Carmichael, Sarah K., Waters, Johnny A., Suttner, Thomas J., Kido, Erika, and DeReuil, Aubry, 2014, A New Model for the Kellwasser Anoxia Events (Late Devonian): Shallow Water Anoxia in an Open Oceanic Setting in the Central Asian Orogenic Belt, Palaeogeography, Palaeoclimatology, Palaeoecology, v. 399, p. 394-403

    Aubry recently finished her Ph.D. in Sedimentology at the University of Utah.

    (Ph.D., 2020, University of Utah; B.S. 2013, Appalachian State University)

  • Allison Dombrowski

    Allison has performed a wide variety of analyses for her Devonian work. She has characterized the mineralogy and Sr isotope signatures of sediments from China, Belgium, and southeast Asia from the Middle and Late Devonian, and analyzed stable isotopes of strontium in the Geochronology and Isotope Geochemistry lab run by Dr. Drew Coleman at UNC-Chapel Hill. Her Sr isotope work was included in the following publication:

    *Paschall, Olivia C., Carmichael, Sarah K., Waters, Johnny A., Koenigshof, Peter, Ta, Phuong H. Komatsu, Toshifumi, and *Dombrowski, Allison D., 2019, The Hangenberg Event in Vietnam: sustained ocean anoxia with a volcanic trigger?, Global and Planetary Change (Special issue on Devonian global changes - recent advances and challenges in different domains, eds. G. Racki and P. Wignall), v. 175, p. 64-81 (DOI: 10.1016/j.gloplacha.2019.01.021) - click here for institutional repository copy with supplemental data

    Most recently, she has been part of the research team that went to Mongolia in 2018 to study mass extinctions in island arc environments; for her senior thesis, Allison characterized a series of volcanic ash units from the Late Devonian to track magma evolution of volcanoes in the East Junggar Arc. Her new work will be included in a number of upcoming publications in Palaeobiodiversity and Palaeoenvironments. Allison will soon begin her work as an intern with the United States Geological Survey.

     (B.S. 2020, Appalachian State University)

  • Josh Feierstein

    Josh worked extensively on this project from the data management angle, working to incorporate gigabites of data we've collected over the past four years into a useable web interface.  His work is the Data Portal part of this website.  He is now a PG and the owner of Natural Geodata, LLC.

    Click here to see examples of his work.

    (Natural Geodata, LLC., B.S. 2015, Appalachian State University)

  • Iris Ferris

    Iris worked extensively on characterizing Mongolian sediments with X-ray diffraction.

    (B.S. in progress, Appalachian State University)

  • John Granholm

    John began working on deciphering football-sized spherical nodules (microbialites?) from Mongolian sediments in Fall 2015, and by Spring 2016 he was working on sediments that cross the Devonian-Carboniferous boundary from the Namur-Dinant basin in Belgium.

    In 2016 he was named a runner up in the AGU Data Visualization contest for his virtual reality work in tectonic reconstructions. He is now teaching robotics at Wake Tech Community College.

    (B.S. 2017, Appalachian State University)

  • Kieran Krommes

    Kieran worked on characterizing Late Devonian anoxia events recorded in sediments from Virginia (USA), and determining the specific provenance of these sediments.

    (B.S. 2018, Appalachian State University)

  • L. McCain Moore

    McCain spent a significant amount of time in the XRD lab working to determine the mineralogy of the Late Devonian Heishantou Formation in northwestern China.  This work resulted in her contribution to the following publication:

    Carmichael, S.K., Waters, J.A., *Batchelor, C.J., Coleman, D., Suttner, T.J., Kido, E., *Moore, L.M., and Chadimova, L., 2016, Climate instability and tipping points in the Late Devonian: Detection of the Hangenberg Event in an open oceanic island arc in the Central Asian Orogenic Belt, Gondwana Research v. 32, p. 213-231 (doi:10.1016/j.gr.2015.02.009).

    She is currently a geologist with the Insight Group in South Carolina.

    (M.S, Queens College; B.S. 2015, Appalachian State University) 

  • Olivia Paschall

    Olivia's work documented the severity of anoxia in basinal sediments from Vietnam on the south China platform at the Devonian-Carboniferous boundary, and postulated that massive volcanism could be a trigger for the Hangenberg Crisis. Her work on this topic was published in 2019:

    Paschall, Olivia C., Carmichael, Sarah K., Waters, Johnny A., Koenigshof, Peter, Ta, Phuong H. Komatsu, Toshifumi, and Dombrowski, Allison D., 2019, The Hangenberg Event in Vietnam: sustained ocean anoxia with a volcanic trigger?, Global and Planetary Change (Special issue on Devonian global changes - recent advances and challenges in different domains, eds. G. Racki and P. Wignall), v. 175, p. 64-81 (DOI: 10.1016/j.gloplacha.2019.01.021) - click here for institutional repository copy with supplemental data

    Olivia was also responsible for mapping the Hushoot Givetiin Gol in 2018 as part of a National Geographic expedition to southwest Mongolia.

    (B.S. 2018, Appalachian State University)

  • Sonia Sanchez

    Sonia has been instrumental in making a detailed petrologic characterization of the Late Devonian Zhulumute Formation in northwestern China.  She is now a geoscientist with FracGeo in Houston, TX.

    (M.S., University of Cincinnati; B.S. 2014, Appalachian State University)

  • Robert Thomas

    Robert started working with the DAGGER group using his Photoshop expertise in combination with recent (2010 - present) tectonics literature to update the positions of island arcs on paleogeographic maps of the Late Devonian (from Ron Blakey's maps, Colorado Plateau Geosystems, Inc.).  His senior thesis characterized the petrology (igneous and sedimentary) of Mongolian rocks from the Hushoot Shiveetiin Gol site, which were collected by IGCP 596/580 in 2014.

    (BS 2017, Appalachian State University)

  • Casey Weber

    While at Appalachian, Casey did preliminary work to determine the feasibility of using FT-IR to detect organic compounds preserved in Asian sediments that record the Kellwasser and Hangenberg Events. She recented graduated with a degree in Environmental Science from Penn State Altoona.

  • Matthew Wilson

    Matt characterized the sedimentology surrounding the the Late Devonian annulata Event in Chinese sediments. He is now working for the National Weather Service.

    (B.S. 2016, Appalachian State University)