Monthly Archives: October 2021

Field trip, Sat, Nov. 20; Tectonic and landscape evolution history at the boundaries of the Blue Ridge Anticlinorium; Haymarket, Virginia area

This one-day field trip will focus on the tectonic and landscape evolution history at the boundaries of the Blue Ridge Anticlinorium. We will examine the early Cambrian Chilhowee group exposed at Thoroughfare Gap at the western edge of the Culpeper basin and see where Mesozoic rocks of the basin are in fault contact with the Blue Ridge Anticlinorium. The trip will continue and move towards the western limb of the anticlinorium and into the Shenandoah Valley where we will discuss Alleghenian compression leading to ductile deformation, as well as some ambiguous breccia bodies in the Antietam formation. We will also see sites and discuss recently acquired cosmogenic burial age dates of surficial deposits that reveal the history of Shenandoah River incision. 

Come prepared for inclement, cold weather and some minimal walking over uneven, steep terrain.  

Please RSVP to Dan Doctor (dhdoctor at by Nov. 18 if you wish to attend. Meeting time: 9 AM. Meeting point: Sheetz in Haymarket, Virginia at the intersection of Rt. 55 and Rt. 15. Leaders: Alan Pitts, Dan Doctor, Will Odom.

The flyer is here, and a map of the area is here. Hope to see you there for our annual field trip!

The trip can accommodate a limited number of vehicles; car-pools will be arranged as needed and vehicles left at the Sheetz station meeting site. All field trip attendees will be required to bring a mask and wear it while car-pooling in vehicles. We will ask to see proof of vaccination against COVID-19, and will require attendees who have not been fully vaccinated against COVD-19 to drive in a separate vehicle. In addition, field trip attendees will be asked to sign a liability waiver to attend the trip.

Bradley Lecture, GSW 1571, Nov. 17, At the Speed of Volcanic Eruptions, by Dr. Terry Plank, at the AGU Hq Bldg or online on Zoom

Dr. Plank is a geochemist recognized for her work on element recycling at subduction zones, and the role of volatiles in magma generation, ascent, and migration. Dr. Plank is on the faculty of Columbia University, and was a MacArthur Foundation Fellow from 2013-2017. The Bradley lecture is GSW’s named lecture, and this year the lecture will be presented in a hybrid format, both virtual and at the American Geophysical Union’s (AGU) Headquarters building at 2020 Florida Av. NW, Washington DC, 2009, only a few blocks north of the Cosmos Club. The virtual meeting will be conducted on Zoom and GSW members have already received information as to how to attend it. Others should contact Mong-Han Huang (mhhuang at for the Zoom link. For those of you coming to the AGU building, proof of vaccination with corresponding identification will be required upon arrival at the building. Wearing masks will also be required at all times inside the building, except when actively eating or drinking. The building will open for socializing/eating/drinking at 7:30 PM, and the program will start at 8 PM. The meeting announcement is here. Hope to see you there for this special event!

GSW Meeting 1569: Draft of minutes for members to evaluate

Please take a look at the draft minutes and see if you have any corrections or additions. If so, please send those ideas to Meeting Secretary Beth Doyle at edoyle[at]

Meetings minutes. PDF format.

GSW meeting 1570 on 13 Oct 2021: Exoplanets from TESS, the lunar sulfur cycle & environmental disasters navigated with magnetofossils

This meeting will return to the virtual-only format, via Zoom. The last two meetings this fall will be hybrid, with both a virtual and in-person component. We have a full schedule of three talks on 13 Oct. Details, including the Zoom link, have been sent to members. For non-members who wish to attend, please email Mong-Han Huang (mhhuang[at] for the Zoom link. Join us at 7:30 PM for socializing. The meeting will begin at 8 PM.