GSA meeting, Day 4

Today was a short day for me, as we had to check out of the hotel and then head back a bit early; Brett has to go almost straight away to another conference to present on virtual field trips. I still was able to make it to a few talks on coastal plain stratigraphy, and see most of the posters.

John Hollis and Chuck Bailey described fractures in the Hylas Fault Zone associated with mountain building in the Carboniferous-Permian and rifting in the Triassic. Carmel Church sits on top of the Hylas Fault Zone (above), which could have had an influence on deposition of the Cenozoic sediments there.

Zachary Stewart et al. examined synsedimentary deformation features in the Cambrian Jordan Sandstone. Synsedimentary structures are those that form during or immediately after deposition, while the sediment was still soft. They documented several types of synsedimentary deformation in the Jordan in Minnesota (below); this is the same unit that outcrops around Baraboo, Wisconsin.


In the education section, Elizabeth Johnson et al. described how James Madison University used commercial stone countertops instead of standard black counters in their labs, so that students can use them as teaching samples in their mineralogy and petrology courses.

There was also a section of 19 posters on revisions and updates to the geologic time scale. Geologic time units are typically defined based on observable features in the rock and/or fossil record, such as a mass extinction, a major unconformity, or the deposition of a distinctive unit. As our understanding of the exact dates and correlations of these events and features improves, the geologic time scale has to be updated.

Brett and I returned home in Wednesday afternoon, but the conference isn’t quite over for me yet. There is a post-meeting field trip to VMNH and the Solite Quarry still to come.

This entry was posted in Conferences and tagged . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s