Nebraska Geological Society



October 16-18, 2021

Northeast Nebraska

Photo Journal – Photos by Jim Anderson

From October 16-18, 2021, NGS field trip participants spent three days traveling by motor caravan through Northeast Nebraska with Bob Diffendal, Jr., Susan Lackey, and Doug Hallum to explore geology, hydrogeology, landslides, water-quality issues, water-availability issues, and hydro-dam issues.

Field Guide: Geology and Hydrogeology of Northeastern Nebraska: Geology, Water Management and Geological Hazards, Nebraska Geological Society Field Trip 2021. Soon to be available at:

First stop was at the failed Spencer Dam. We had the opportunity to explore the Pierre Shale outcrops, observe small landslides, Niobrara River, and the failed Spencer Dam.

Bob Diffendal, Jr. and Doug Hallum discuss the local geologic section.

At the second stop, Susan Lackey discusses the artesian Water well in Knox County.

Last stop of the first day was a trail along the north side of Niobrara State Park where we explored the Niobrara Chalk and landslides originating in the overlying Pierre Shale. Here we observe the former railroad and trail bridge damaged by the 2019 flood event on the Niobrara River.

We finished the day with an optional social outing at Nissen Wines owned by the family of NGS member Mary Aschoff. Located by Hartington, NE

Day 2 started with a tour of the Cedar Knox Rural Water Project water-treatment plant and the water-inlet along the Lewis & Clark Lake. Big focus of the discussion was investigations for alternative groundwater sources by Susan Lackey and Annette Sudbeck of the Lewis & Clark NRD.

We enjoyed the great views of the Niobrara Chalk along the south side of the lake.

We also had a chance to look at the Niobrara Chalk!

A highlight of the trip was a tour of Gavins Point Dam powerhouse.

Another stop was a discussion of the Bazile Groundwater Management Area Plan with Lower Elkhorn NRD Manager Mike Sousek and UNL Extension Educator Jeremy Milander. A big focus was the high nitrate concentrations in the Bazile Creek area and efforts to work with producers on proper management of nitrogen applications.

Last stop of the day was visiting Ogallala Group outcrops west of Creighton, NE.

For the third day of the trip, we started with a visit to Carlile Shale along Hwy 15 south of Vermillion, SD.

Second stop on the third day was the Ionia Volcano (well, not a real volcano) along the bluffs of the Missouri River.

We visited Ponca State Park. First stop was an overlook where Bob Diffendal, Jr. provided a great overview of the local geology and Lewis & Clark exploration trip.

We also visited the boat dock where we reviewed the outcrops of Dakota Group, Hartland Shale Member or the Greenhorn Limestone, and the Greenhorn Limestone.

Last stop of the third day and trip was Dakota Group outcrops at Homer, Nebraska.

We also viewed lectures on area groundwater investigations by Susan Lackey and Chris Hobza of the USGS.

The AAPG Mid-Continent Section Convention

October 3-5, 2021 in Tulsa, OK


annual meeting program, September 16, 2021

"Discovery of a vast network of exhumed, Cenozoic channel bodies on the Great Plains"

Jesse Korus, Associate Professor, Conservation and Survey Division, UNL


Streams have shaped the Great Plains for the past 65 million years and their deposits host important aquifers, fossils, and geological resources. Despite the ubiquity of Cenozoic channel bodies, details on fluvial style, morphology, and drainage pattern have remained elusive. This talk presents the discovery a vast network of fluvial ridges on the Great Plains spanning Paleocene through Pliocene strata across portions of six states (CO, NE, WY, SD, ND, MT). These ridges are the relics of channel fills preserved as positive-relief landforms capped by sandstone, conglomerate, and gravel. Ridges are as much as 120 m in height, but most of them are subtle, a few meters high, and discernable only in high-resolution aerial photographs and LiDAR. New mapping of >1,000 linear km of ridges and the direct detection of channel body morphology shows that fluvial systems were diverse and spatially variable. Moreover, this work reveals that sediment dispersal systems and fluvial styles evolved dramatically during the formation of the Great Plains.



From October 18-20, 2020, NGS field trip participants spent two days traveling by motor caravan through central Nebraska with Paul Hanson, Shane Tucker and Doug Hallum to explore the geology and hydrogeology of the upper Platte, Lower South Platte and Lower North Platte rivers.

FREE DOWNLOAD OF FIELD GUIDE "Hydrogeology and Geology of the Lower North and South Platte Rivers of Nebraska: Nebraska Geological Society Field Trip 2020" is available at: 

Participants peer into the Lake McConaughy spillway.

Shane Tucker leads the tour into a more detailed look at Ash Hollow Formation outcrop.


Please join the Nebraska Geological Society in congratulating long-time Nebraska Geological Society Member and renowned Husker Geologist Priscilla Grew on being honored with the naming of a new mineral in the garnet supergroup - priscillagrewite!  See the article in the Nebraska Today using the link below.

News from UN-L

​Congratulations to Sheri Fritz, George Holmes Professor in the  UNL Department of Earth and Atmospheric Science on her highly prestigious election as a Fellow of the American Geophysical Union (AGU) !
Sheri has previously won national and international scientific medals and awards for her outstanding research using lake sediments as clues to past climate change. She has been honored for distinguished contributions to Quaternary paleolimnology and paleoclimatology, particularly for work at the intersection of ecology and geology relevant to climate change research and conservation. 


NGS charter member, our first Secretary, and current History committee member, Duane Eversoll, received the 2018 Maurice Kremer Groundwater Achievement Award.  Duane Eversoll was presented with the award at the Maurice Kremer Memorial Lecture on February 27, 2019 at 3:30 p.m. in the Hardin Hall Auditorium (room 107) on the University of Nebraska-Lincoln East Campus (33rd and Holdrege Streets, Lincoln). 

NGS 50th Anniversary Celebration

NGS head its 50th Anniversary celebration at Blue Blood Brewing Company in Lincoln on November 17, 2018, in spite of slick roads and snow swirling through town.  The celebration featured a tour of Robber's Cave with local historian and author Joel Green.  Joe's book; "Robber's Cave: truths, Legends, Recollection" is available for purchase at  

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