EAST TENNESSEE GEOLOGICAL SOCIETY
January 2021 Meeting
Monday,
January 11, 2021
6:00 - 7:30 pm
Note: ETGS members will receive an email with info for logging into the meeting.
JANUARY PRESENTATION
Late Neoproterozoic to early Cambrian biological and tectonic transitions in the
Southern Appalachians (Chilhowee Gp)
By
Dr. Steve Hageman, Professor of Geology
Department of Geological and Environmental Sciences
Appalachian State University, Boone, NC
Abstract
Clastic
sediments of the Laurentian margin of eastern North America record
the tectonic event of the breakup of the Panotian supercontinent to
form the Iapetus Sea. Superimposed on the tectonic/environmental
signal of these sediments is the macroevolutionary history of the
diversification of multicellular organisms and their creation of new
ecosystems. The earliest record of this transition is more clearly
preserved in trace fossils than body fossils.
Recent discoveries of trace fossils in the Chilhowee Group include
trace fossils not previous recorded from these rocks and suggest an
alternative chronostratigraphic interpretation. A succession of
trace and body fossils (E TN and SW VA) show a transition from those
consistent with the Ediacaran in the mid-Unicoi Fm, those of the
early Cambrian (Fortunian) in the upper Unicoi Fm and lower Hampton
Fm, those of the Cambrian Agronomic Revolution is present in the
middle Hampton Fm (unnamed Stage 2), and typical of the rest of the
Paleozoic from the Erwin Fm (upper-lower Cambrian).
A multi-year effort to relocate and collect from Walcott's (lost)
southern Appalachian trilobite localities has yielded new,
well-preserved nevadiid trilobite specimens from the Murray Shale
(mid-upper Chilhowee Gp.) in the region of Walcott's original
locality. The site yields abundant well preserved hyolithids and
other arthropod? specimens (Murray fauna). Fossils from this unit
establish affinities of the Murray Sh (Erwin Fm) with the late-early
Cambrian Sirius Passet Lagerstatte in Greenland.
Biography
In late 2019 Dr. Steve Hageman was recognized
as a newly elected
Fellow of the Geological Society of America (GSA)
at the Phoenix, Arizona meeting.
"Steven J. Hageman merits GSA Fellowship based on: publication of
his internationally regarded research on fossil bryozoans with
important implications for evolution, paleoecology and sedimentology;
dedicated teaching and mentoring of geology students with impacts
beyond his institution; and service to the profession, particularly
as editor of the Journal of Paleontology," said Patricia Kelle, past
president of the Paleontological Society.
Society Fellowship is an honor bestowed on the best of the
geological profession by election. GSA members are nominated by
existing fellows in recognition of a sustained record of
distinguished contributions to the geosciences and the Geological
Society of America through such avenues as publications, applied
research, teaching, administration of geological programs,
contributing to the public awareness of geology and leadership of
professional organizations.
"Steve has a talent in the classroom for opening up the world to
Appalachian students, many who have not traveled far from home. He
encouraged two of his undergraduate research students to pursue
their Ph.D.'s internationally. Steve's scholarly activity includes
serving as a patient mentor to undergraduate students. He has
supervised 12 undergraduate senior theses. Additionally, he has
spent countless hours leading students on field trips in the
Appalachia region and to visit museum collections," said Dr. Ellen A.
Cowan, GSA nominator and professor in the Department of Geological
and Environmental Studies.
Hageman joined the Appalachian faculty in 1998, coming from a
research associate position at the Field Museum of Natural History
and a postdoctoral appointment at the University of Adelaide, South
Australia. His research interests are in patterns and processes of
evolution, particularly microevolution and speciation. His primary
study groups are Cenozoic cheilostomate and Paleozoic stenolaemata
bryozoans.
He also received the University College Transfer Student Champion
Award in 2019, in addition to being a two-time award recipient of
the Fulbright Scholarship in 2006 and 2018. In 2009, Hageman
received the Board of Governors' Appalachian State University
College Teaching Award.
Hageman earned his Ph.D. and M.S. from the University of Illinois
and his B.S. from the University of Kansas.
Greetings, and welcome to the January 11, 2021 ETGS virtual meeting.
We hope you, your family, and your colleagues are staying healthy
and well as we endeavor to "flatten the curve".
As a courtesy please mute your cell phone or the microphone in your laptop/tablet to minimize background noise and feedback echos. We will also make an effort to mute all participants - at least until the presentation is finished. Please use the chat feature to type any comments or questions you may have. We recommend that you send questions for the speaker to "everyone" so all participants can see the question. In the interest of time, we may hold the Q&A at the end of the presentation.
We will create a virtual attendance list. It is not always possible
to tell who is participating, especially for those joining by phone,
so please email
etgs@live.com
to be listed on the attendance sheet. Let us know exactly how your
name should appear on the list. We will add a note explaining the
lack of signatures due to COVID-19-induced distancing and have an
ETGS officer sign as usual.
Thank you for your patience and understanding as we try this online
format. As always, we welcome and appreciate your feedback and
suggestions for improvement.
Page updated December 22, 2020 |