ARCHIVED CONTENT: In December 2020, the CZO program was succeeded by the Critical Zone Collaborative Network (CZ Net) ×



Giesen talks about “The Jim Crow South & The Lost Cause”

01 Sep 2020 - History Professor Jim Giesen, a Calhoun CZO collaborator, is teaching a class in Modern U.S. History to more than 800 students at Mississippi State...

Geology of the Calhoun CZO

05 Jun 2020 - Barrett "Bear" Jordan's MS thesis on the geology of the Calhoun is now posted!  Bear's advisor Paul Schroeder says this is "a bit more...


Field trip of Penn State students to the Calhoun, 6/7/2019

21 Aug 2019 - Dan Markewitz and Dan Richter led a field trip on June 6-7, 2019 in the rain (perhaps 3") across the Calhoun CZO with Penn State students.  We...

Mac Callaham’s group presents at the Society for Freshwater Science annual meeting

31 May 2019 - Mac Callaham and his group shared their research on earthworms at the May 2019 Society for Freshwater Science annual meeting in Salt Lake City.

Feature-Length Documentary: The Education of Bruno Latour: From the CZ to the Anthropocene

07 May 2019 - April 15, 2019 Franklin Humanities Institute “The Education of Bruno Latour: From the Critical Zone to the Anthropocene”...


Calhoun CZO featured in Duke Magazine

14 Nov 2018 - How critical zone science unearths secrets: The new cross-disciplinary field of study concerns itself with the living skin of the Earth.

Undergraduate course curriculum, “Introduction to Critical Zone Science,” available free online

01 Jan 2018 - A 15-week semester-long upper-level undergraduate course curriculum entitled “Introduction to Critical Zone Science” is now available free online.


Water Resources Research Special Collection: Concentration-discharge relations in the critical zone

30 Oct 2017 - Water Resources Research published a new special collection in September 2017 featuring concentration-discharge research from multiple CZOs.

X-ray Diffraction for Clay Minerals at Calhoun

01 May 2017 - Anna Wade (visiting from Duke University) and Jay Austin (based at the University of Georgia) are collaborating by using X-ray Diffraction (XRD) to...

Zach Brecheisen wins the Frederick K. Weyerhaeuser Forest History Fellowship

27 Apr 2017 - The Forest History Society announces that Zachary Brecheisen is the 2017-18 recipient of the F. K. Weyerhaeuser Fellowship! The fellowship consists...

2017 CZO Webinar Series: Critical Zone and Society

06 Apr 2017 - 2017 CZO Webinar Series: Critical Zone and Society.

Diego Barcellos Featured in UGA Graduate School Magazine

08 Feb 2017 - The Winter 2017 issue of UGA Graduate features an in-depth article about cross-CZO grad student Diego Barcellos


Bruno Latour talks about the Calhoun CZO in Munich

08 Dec 2016 - Bruno Latour, anthropologist and philosopher of science, gave a talk on Critical Zone science and the Anthropocene entitled "From the Anthropocene...

CZOs at AGU 2016

22 Nov 2016 - CZOs at AGU 2016: Agenda and award recipients

Eight new soil pits dug at the Calhoun!

17 Oct 2016 - Eight soil pits were installed at the Calhoun CZO on 17-18 October 2016 for easy access for soil sampling down to 2 meters. Photo: Will Cook.

USFS Photos from the Historic Archive of the Calhoun Experimental Forest

03 Oct 2016 - Just posted, thanks to efforts of Don Nelson, Kathy O'Neill, Mike Coughlan, Michael Lonneman, Zachary Meyers, and many other students, is an...

First flux tower erected at the Calhoun CZO

17 Aug 2016 - On August 17, 2016 a crew from Georgia Tech led by graduate student Yao Tang and professor Jingfeng Wang, with a little help from the folks at Duke,...

Field trip to quarry near Calhoun CZO

09 Jun 2016 - On Thursday 9 June 2016, Paul Schroeder led a several hour tour of the Hanson Aggregates Quarry (AKA Mary Lou Rock Quarry) in Clinton SC, about 15...

Critical Zone Profile - Diego Barcellos

09 Jun 2016 - PhD Student, Soil Science, University of Georgia

Historic Legacy Sediments Examined at 2016 Summer Science Meeting

03 Jun 2016 - The Calhoun CZO held its third annual Summer Science Days meeting.  In the photo, Calhoun researchers discuss a 18th-19th century pine root...

The Calhoun Experimental Forest featured in USFS publication

30 Mar 2016 - The USFS Southern Research Station's CompassLive blog features an article about the history of the Calhoun Experimental Forest, founded in 1947....

Water Resources in a Changing Climate

19 Jan 2016 - CZO community members were chosen as keynote speakers at Colorado State University's Hydrology Days 2015.


Critical Zone Profiles - Meet the people doing CZO science (Calhoun CZO)

15 Nov 2015 - Get a sense of the people and the work. Several members of the Calhoun CZO are profiled here, including students and professors.

Critical Zone Profile - KYUNGJIN (KJ) MIN (soil ecologist, PhD student)

15 Nov 2015 - PhD Student, Department of Ecology and Evolutionary Biology, University of Kansas

Critical Zone Profile - KATHERINE O’NEILL (ecosystem ecologist, Associate Professor)

15 Nov 2015 - Associate Professor, Environmental Science, Roanoke College

Bruno Latour, Science philosopher and anthropologist visits scientists at the Calhoun CZO

09 Oct 2015 - A dozen diverse scientists and scholars from five universities, united by their interest in Prof. Latour and in human-nature relations, traveled by...

Sino-USA CZO scientists meet to discuss future collaborations

09 Oct 2015 - About 60 Chinese and American critical zone scientists met in Guiyang, China for two days of discussions and presentations on the significance of...

CCZO researcher Amilcare Porporato lectures on soil moisture dynamics and stoichiometry controls

27 Aug 2015 - Presented at the University of Saskatchewan's Global Institute of Water Security 10/29/2014

CCZO researchers publish new perspectives on the human‐water system

25 Aug 2015 - A team at Duke uses mathematical models to identify periods when global water use changed dramatically and project a similar change for this century.

Joint AGU-ESA Event Brings Together Collaborative Networks

17 Aug 2015 - Members of AGU and the Ecological Society of America came together in their first joint event to discuss opportunities for research collaboration.

CZO Ecology Session at ESA 2015 Meeting

16 Jul 2015 - A session entitled 'Ecology in the Critical Zone" will take place at the Ecological Society of America (ESA) 2015 Meeting held  from August...

Salon on Deep Critical Zone Architecture held June 14-18, 2015

26 Jun 2015 - An international group of 17 researchers met at Snow Mountain Ranch, Granby, Colorado for 3.5 days of presentations and discussions on the nature of...

Paul Schroeder presents talks on CZO science in Turkey

20 Jan 2015 - Geology Prof. Paul Schroeder from UGA is on sabbatical at Istanbul Technical University in Turkey and has been spreading the word about CZO science.


Deep historic legacy sediments along Holcombe’s Branch

17 Dec 2014 - Examining historic legacy sediments along Holcombe's Branch.

Cross-CZO activities

23 Jul 2014 - 1) Aaron Thompson is leading CCZO researchers in cooperating with other CZOs (notably Luquillo) to facilitate cross-CZO research to investigate the...

Duke PhD Students win 2-year IGERT Fellowships

23 Jul 2014 - Three students working on the Calhoun CZO have been selected to join Duke’s WISeNet program on wireless technology.  They will work...

2014 All Hands Meeting

24 Apr 2014 - Information for the 2014 All Hands Meeting for the CZO Network on 21-14 September, including registration information and abstract submission.

“What’s so critical about the Critical Zone?” webinar

02 Apr 2014 - March 31, 2014. Dr. Enriqueta Barrera (NSF CZO program director) and Dr. Gordon Grant (USFS; CZO Steering Committee chairperson)

Introducing Calhoun CZO

03 Mar 2014 - The Calhoun CZO seeks to understand how Earth’s Critical Zones respond to and recover from severe erosion and land degradation.

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