Arizona Geological Society


Upcoming events

    • 05 Jun 2018
    • 6:00 PM - 9:00 PM
    • Sheraton, 5151 E Grant Rd. (& Rosemont), Tucson AZ 85712

    Sponsored by:   Available

    The Geoarcheology of Ancient Water Control in the Southwest:  Lessons from the Past

    by Gary Huckleberry, Dept of Geosciences, University of Arizona

    Abstract -The control and management of water in the North American Southwest dates back at least 3500 years and played a key role in long-term adaptations of ancient societies. Water was captured, diverted, and stored for purposes of domestic consumption and agricultural production. Strategies varied depending on local environmental factors and cultural needs. Hundreds of miles of canals were constructed along perennial rivers like the Salt, Gila, and Verde. Earthen reservoirs were constructed to capture runoff in the desert interior. Evidence for this ancient hydraulic infrastructure can be quite subtle depending on the scale of engineering and geological processes that modify the archaeological record. An understanding of geological surficial processes is essential for studying these ancient waterworks given that the physical remains are often defined by stratigraphy and best understood when placed within a geomorphic context. I will discuss some of my geoarchaeological research on ancient water control, focusing on the southern deserts of Arizona where water management was a hallmark trait of ancient societies like the Hohokam (A.D. 450-1450). This research makes clear that people have long dealt with the challenges of population growth and climate variability in arid environments, and that human resilience to stress varied through time. Such insights are relevant to the challenges we face today in the Southwest.

    Bio -Gary Huckleberry received his doctorate from the Department of Geosciences at the University of Arizona and has conducted over 30 years of consulting and research in North and South America. He was a professor in the Department of Anthropology at Washington State University from 1995 to 2004, and served as Co-Editor of Geoarchaeology: An International Journal from 2007-2017. His specialties include geoarchaeology, geomorphology, soils, and stratigraphy and most of his research has been in desert environments. Current research projects include reconstructing El Niño history through study of flood deposits along the north coast of Peru, analysis of ancient agricultural soils in the high Atacama of Chile, excavating shell midden sites along the Gulf of California to understand ancient coastal adaptations, and identifying indigenous water control features in the North American Southwest for purposes of understanding human ecology and supporting modern Native American water rights claims.



    • 07 Aug 2018
    • 6:00 PM - 9:00 PM
    • Borderlands Brewing, 119 East Toole Avenue, Tucson AZ 85701

    Sponsored by: Boart Longyear

      Rhodochrosite:  Red Treasure of the Rockies -
    the Story of the Sweet Home Mine

    Narrated by Karl Mecklenberg

    August 7, 2018

    Our regular August dinner meeting has been canceled in lieu of a special event, which will be held at Borderlands Brewing (119 East Toole Avenue, Tucson AZ  85701) on Tuesday, August 7, 2018 between 6 and 9 PM.

    Members of the Arizona Geological Society as well as members of the public are invited to come out and view a video on the Sweet Home Mine and have a good time, drink some beer, eat some snacks and "talk rocks".

    - This video tells the story of the Sweet Home Mine from its beginning as a modest, 1870s silver mine to its rebirth as a world-renowned source of crystal specimens.  Experience hard rock mining up close.  Watch miners within Colorado's 14-thousand foot Mount Bross as they drill and blast trying to find elusive pockets of natural riches.  Learn how science guides the underground treasure hunt.  Follow geologists as they try to unravel the mysteries of the ancient mountain.  See some of the most spectacular natural wonders ever brought to light.  Several of these mineral specimens will sell for over a million dollars each in today's market.

    The cumulative value of the rhodochrosite specimens recovered from the Sweet Home mine over the years probably exceeds $100 million, and the mine is clearly the world's premier source of fine rhodochrosite.  All in all, that's not a bad record for a "failed" silver mine.


    • 04 Sep 2018
    • 6:00 PM - 9:00 PM
    • Sheraton, 5151 E Grant Rd. (& Rosemont), Tucson AZ 85712

    Sponsored by:   RockWare, Inc.

    Applying Geological Exploration Methods Towards the Location of Clandestine Gravesites

    by Jim Reed, NecroSearch International

    Abstract -In 1988, NecroSearch International, a non-profit organization, was founded to provide the international law enforcement community with scientific assistance in locating clandestine gravesites related to homicides.  Thirty years later, NecroSearch has assisted police and district attorneys with more than 300 cases in 40 states on four continents.  Although geology is just one of many different disciplines that are provided by NecroSearch volunteers, this presentation will focus on how geological exploration methods have been applied towards solving crimes.  

    Examples of the following geological topics as applied towards actual homicide investigations will be presented:

    • Computer Methods (e.g. multivariate grid and block modeling)
    • Drone-Based Methods (e.g. LIDAR, MAG, Multispectral Imagery, Thermal Infrared)
    • Geochemistry (e.g. soil gasses, alternate light source detection)
    • Geomorphology (e.g. subsidence and soil dessication)
    • Geophysics (e.g. electromagnetics, ground penetrating radar)
    • Geotechnical (e.g. compaction and penetrometer surveys)
    • Hydrogeology (e.g. surface and groundwater flow and evidence transport)
    • Mineralogy (e.g. tracing minerals to source locations)
    • Paleontology (e.g. urbanite index fossils as time horizons)
    • Stratigraphy (e.g. Steno’s law of superposition and soil mixing)

    More information may be obtained at

    Bio -Jim Reed is the Director of R&D at RockWare, Inc, a geological software development and consulting company with offices in Golden, Colorado and Lugano, Switzerland.  Prior to founding RockWare in 1983, Jim worked at NASA, Arch Coal, Freeport, AMAX, and Wold Minerals.  Jim received his geological education at the University of Wyoming and Washington University in St. Louis.  He is currently a councilor with the Colorado Scientific Society and a volunteer with NecroSearch International.  Over 30,000 individuals, corporations, universities, and government agencies on all continents use Jim’s software products.



Past events

01 May 2018 William B. White presents The Science of Caves and Cave Contributions to Science
21 Apr 2018 Spring Field Trip - Jerome - An Early Proterozoic Volcanogenic Massive Sulfide Deposit
03 Apr 2018 Volker Spieth and Stanley Keith Present - Finding Gold in the Kupferschiefer
29 Mar 2018 Future Home of the University of Arizona Gem and Mineral Museum
06 Mar 2018 Joe Wilkins, Jr. Presents - Piedras Verdes and Cuatro Hermanos, Sonora, Mexico - A Tale of Two Porphyries
06 Feb 2018 Paul F. Hlava presents Causes of Color in Minerals and Gemstones
02 Jan 2018 Peter L. Ward presents Bringing Peace to the Climate Wars
05 Dec 2017 Joellen Russell presents The Ocean's Role in the Climate of the Anthropocene
07 Nov 2017 Eric Sundquist presents Geological Perspectives on Carbon Dioxide, the Carbon Cycle and Carbon Management
03 Oct 2017 Lily Jackson presents Andean River Sediments as a Window into the Tectonic History of Ecuador
05 Sep 2017 Vic Baker presents The Influence of the 18th Century Enlightenment on the Natural Sciences
22 Aug 2017 AGS Meet and Greet, A Networking Event
11 Jul 2017 Andrew Zaffos presents Global Tectonics and Marine Animal Diversity
06 Jun 2017 Dan Johnson presents Introduction to the Florence Copper Project and In-Situ Copper Recovery
02 May 2017 Robert Glennon presents America's Water Crisis and What To Do About It
22 Apr 2017 Spring Field Trip - The Laramide-age Chilito Porphyry Copper Deposit
04 Apr 2017 David London presents The Nature and Origins of Internal Zonation within Granitic Pegmatites
07 Mar 2017 Derek J. Thorkelson presents The Precambrian Tectonic Connection between Yukon and Arizona
07 Feb 2017 Daniel Hummer presents Mineral ecology and evolution: Using large datasets to tell the story of the co-evolution of Earth and life
03 Jan 2017 David A. Sawyer presents Dating Geologic Time in the Cretaceous: Integrating Biostratigraphy, Isotope Geochronology, and Astrochronology in Sedimentary Deposits of the Cretaceous Western Interior Seaway
06 Dec 2016 John W. Ewert presents USGS Responses to Some Volcanic Crises and Eruptions Around the World
01 Nov 2016 Alexander Schauss presents Minerals, Trace Elements and Human Health
22 Oct 2016 Fall Field Trip - The Peach Spring Tuff and the Silver Creek Caldera, Northwestern Arizona
04 Oct 2016 Hamish Martin Presents Geology of the Resolution Cu-Mo Deposit, Superior Arizona
06 Sep 2016 Keith R. Long Presents No Bonanza from Cheap Oil
02 Aug 2016 Lee Allison Presents The Future of State Geological Surveys: the Arizona Case Study
05 Jul 2016 Don Applebee Presents Genesis of the Chilito Porphyry Copper Deposit
07 Jun 2016 Robert Hildebrand Presents Collisions, Slab Failure Magmatism and the Development of Cordilleran Batholiths
03 May 2016 Peter Modreski will present "Pegmatites: Mineralogy, Gemstones, Economic Geology, and maybe not quite the same Giant-Crystal Rocks you always thought they were"
30 Apr 2016 Spring Field Trip - An Introduction to the Pinal Schist in Southeastern Arizona
05 Apr 2016 Jordon Bright Presents Looking for an Ocean in the Desert, the Enigmatic Bouse Formation
01 Mar 2016 Peter R. Johnson Presents Tectonics and Mineral Deposits of the Arabian-Nubian Shield
02 Feb 2016 Dr. Karen Wenrich Presents The Ga-Ge Rich Apex Mine, Utah - A Tsumeb, Namibia Analogue
05 Jan 2016 Sarah Baxter Presents Calc-silicate Alteration and Ore Characterization, ASARCO Mission Complex, Pima County, Arizona
01 Dec 2015 Peter Smith Presents The Latest News from Mars
14 Nov 2015 Fall Field Trip - Northern Plomosa Mountains and Bouse Formation in Blythe Basin
03 Nov 2015 Karen Kelley presents The Giant Concealed Pebble Cu-Au-Mo Porphyry Deposit, Southwest Alaska
06 Oct 2015 Caleb King presents Eocene Hydrothermal Systems and Contrasting Hydrothermal Alteration in the Battle Mountain District, Nevada
01 Sep 2015 Carl Bowser presents The Genesis of the Kramer Borax Deposit, Rogers Lake, Mojave Desert, CA:
04 Aug 2015 Dan Lynch presents Volcanoes in the Back Yard
07 Jul 2015 Erik Melchiorre presents The Complex Geological History Recorded by Arizona Placer Deposits:
02 Jun 2015 Jan C. Rasmussen Presents - Arizona Mineralization through Geologic Time
05 May 2015 Gordon Haxel Presents - Alpine peridotite in the desert - Arizona's Laramide subduction complex
02 May 2015 Spring Field Trip - Oak Creek - Mormon Lake Graben
18 Apr 2015 Third Annual Arizona Geological Society Doug Shakel Student Poster Event
03 Mar 2015 Apollo 17 Astronaut and Former Senator Harrison H. Schmitt presents A Geological Visit to a Valley on the Moon
03 Feb 2015 Don Yurewicz Presents Assessing Unconventional (Continuous) Hydrocarbon Resource Plays
06 Jan 2015 Arend Meijer presents: Sulfide-rich Proterozoic Mafic Rocks and Arizona Porphyry Copper Deposits - A Connection?
02 Dec 2014 Victor R. Baker: Megafloods on Earth, Mars, and Beyond
15 Nov 2014 Fall Field Trip - Debris Flows Shape the Sabino Canyon Landscape - look out below!
04 Nov 2014 Isabel F. Barton: Historical Development & Current State of Geological Research in the Central African Copperbelt
07 Oct 2014 Apollo 17 Astronaut and Former Senator Harrison H. Schmitt presents A Geological Visit to a Valley on the Moon
02 Sep 2014 Lewis Land presents Evaluation of Groundwater Residence Time in a Karstic Aquifer System
05 Aug 2014 Jamie Molaro presents Thermal Stress Weathering in the Inner Solar System
01 Jul 2014 Jim Leenhouts presents Surface-water/groundwater Interactions in Arizona
03 Jun 2014 Arend Meijer presents Pinal Schist of So. Arizona--A Paleoproterozoic Fore-Arc Complex
06 May 2014 John C. Lacy presents The Genesis of Mining Law
26 Apr 2014 Spring Field Trip - Geology of the Christmas Porphyry Copper Deposit
24 Apr 2014 Second Annual Arizona Geological Society Doug Shakel Student Poster Event
01 Apr 2014 Eric Seedorff presents, Structural Dismemberment of a Porphyry Molybdenum System, Spruce Mountain District, Northeastern Nevada
04 Mar 2014 John Dreier presents, Copper Deposits of the Coast Ranges of Chile; A trip through time, space, and ore deposit nomenclature
04 Feb 2014 Ralph Stegen presents The Morenci Porphyry Cu-Mo Deposit, Greenlee County, Arizona: A Geologic Summary with Emphasis on Hypogene and Supergene Mineralization
07 Jan 2014 Steve Castor presents, Mountain Pass and other North American Rare Earth Element Deposits
03 Dec 2013 Stephen Jackson, USGS, Looking forward from the past: Ecological impacts of climate change through the lens of history
05 Nov 2013 Malcolm Siegel, PhD, MPH, LJS Consulting, Inc and School of Medicine, University of New Mexico, Albuquerque, NM. 87047: Uranium Mining in the American Southwest: Can Medical Geologists Ask the Right Questions?
04 Oct 2013 Field Trip - H. Wilson Sundt Generating Station
01 Oct 2013 Mark Logsdon, Principal Geochemist, Geochimica, Inc.: What Does “Perpetual” Management and Treatment Mean? Toward a Framework for Determining an Appropriate Period-of-Performance for Management of Reactive, Sulfide-Bearing Mine Wastes
01 Oct 2013 Mark J. Logsdon, Geochimica, Inc., Does acid-rock drainage lead to waste-rock instability? Geological, hydrological, and geochemical framework for the Questa Mine
03 Sep 2013 Pete Reiners, UA, Geosciences Dept., Geochronology of secondary Fe & Mn oxides in bedrock
30 Aug 2013 Field Trip - University of Arizona Tree-Ring Research Laboratory
06 Aug 2013 Bill Stavast, Freeport-McMoRan Copper & Gold, The Safford Mine: What we have learned since production began
02 Jul 2013 Lukas Zurcher, USGS, presents: "Tectono-magmatic evolution of the Central Tethys Region"
04 Jun 2013 Steve Van Nort presents, "Gold Fever! The BRE-X/Busang Story
07 May 2013 Federal lands and mineral resources: Colorado Plateau uranium deposits and the Sonoran Desert Heritage
18 Apr 2013 First Annual Arizona Geological Society Doug Shakel Student Poster Event

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