Past Events

Lucas R M Johnson, PhD, RPA, Far Western Anthropological Research Group, Inc.

Dr. Johnson's research at Caracol, Belize began in 2010 and initiated his training and application of ED-XRF on over 2,000 ancient Maya obsidian artifacts. Through this geochemical and technological analysis, he learned the basics of XRF physics, the importance of source reference material, and advanced statistical methods used to assign artifacts to known sources to assess ancient regional trade through time. Concurrent with this project, he worked with an international team to characterize obsidian artifacts from two project locations in Ethiopia. Through these projects, he established relationships with XRF specialists and developed a deeper knowledge of portable XRF instruments. Currently, as a practicing archaeologist in cultural resource management, he is expected to apply XRF analysis to obsidian, other volcanic rocks, and potentially other materials in conventional and in often creative ways. As a member of a laboratory team at Far Western Anthropological Research Group, Inc. and working toward advancing technical reports and research papers, he has stayed current with XRF literature describing analyses of various materials, taught other lab staff the fundamentals of XRF, and trained them to use an XRF instrument.

Marc Marino, MA, RPA, University of Arkansas

Marc Marino’s archaeological training with pXRF as an undergraduate student began with Dr. Lucas Johnson at the University of Central Florida Archaeology Laboratory in 2011. Subsequent training with Dr. Wesley D. Stoner, in both pXRF analysis and statistical analysis of data obtained with Neutron Activation Analysis (NAA), built on that foundation at the University of Arkansas, Fayetteville. His internship at the University of Missouri Research Reactor (MURR) with Dr. Brandi Lee MacDonald focused on the trade and exchange of decorated ceramics and obsidian in Aztec Period Mexico (specifically on the independent Tlaxcallan State). While his dissertation research was accomplished using NAA, XRF, and pXRF of obsidian, ceramics, clays, and sediments, Dr. MacDonald also introduced him to other applications of chemical analysis, including the analysis of ochres and pigments. Combined, these experiences have provided exposure to a wide range of projects across broad geographic areas.

Applications of XRF in archaeology have expanded beyond the analysis of homogenous materials, such as obsidian, to include more heterogenous materials used, created, formed, or associated with human practices. Applications therefore include characterizations of ceramics, metals, glasses, soils, sediments, plasters, pigments/ residues, cherts, and metavolcanic or metasedimentary rocks. While obsidian analysis is relatively straightforward, the other materials require additional procedures before formulating interpretations based on geochemical attributes. This online seminar presents two case studies, one using obsidian artifacts from the western Great Basin and one using both coarse and fine-paste ceramics from Mesoamerica. In this seminar, the instructors examine appropriate methods to prepare specimens, to assess the precision and accuracy of results obtained, and discuss the strengths and weaknesses of different sample preparation techniques. While it is recognized that a ‘one size fits all’ method does not exist for all pXRF applications, we discuss what factors should be given careful consideration if the goal is to share data across projects and emphasize that such results are of the greatest utility to clients and stakeholders alike.

1. Introduce the method of XRF to those who may or may not have access, but are interested in using XRF to answer anthropological questions relating to obsidian and ceramics.
2. Present case studies by which attendees may learn how to perform a specific analysis.
3. Outline what is required for XRF analysis of a given material and the limitations of XRF in analyzing certain materials.
4. Describe the fundamental physics of XRF and how software transforms XRF spectral to analytical units (i.e., calibrations).
5. Explain the basics of analyzing parts per million or weight percent versus untransformed photon peak counts (i.e., statistical procedures).

Mark Agostini, BA, MA, Brown University

Mark Agostini grew up in the town of Medfield, Massachusetts and from an early age became interested in archaeology and anthropology. He attended the University of Vermont, Burlington as an undergraduate majoring in Anthropology and Film. While there he became interested in archaeology of the American Southwest. Through the support of an NSF Research Experience for Undergraduates (REU) Fellowship, he completed an honors thesis exploring shifts in pottery traditions and communities of practice at sites in the Silver Creek region of East-Central Arizona. In 2016, he entered the Anthropological Archaeology PhD program at Brown University and since then has focused on methods of ceramic analysis like archaeometry and petrography while adopting new and less invasive approaches like LiDAR analysis, and surface artifact surveys of archaeological sites. His dissertation project is a collaborative archaeology partnership with the Pueblo de San Ildefonso in New Mexico, which aims to address questions concerning San Ildefonso Pueblo's archaeological and ethnographic ties to their earliest ancestral villages atop the Pajarito Plateau and in the Rio Grande Valley (1300 – 1600 CE).

Ancestors of the descendant Pueblo people living in the Tewa Basin of what is now the northern Rio Grande region of New Mexico experienced significant social, political, and economic transformations beginning in the late-thirteenth and early-fourteenth centuries. This talk summarizes the progress of a collaborative archaeological partnership with the Pueblo de San Ildefonso that investigates and builds on aspects of their historical connections to the Pajarito Plateau and their earliest ancestral village in the Rio Grande Valley called Perage (LA 41). Through LiDAR analysis, digital re-mapping, and artifact survey, this project evaluates how ancestral villages of San Ildefonso Pueblo on the Pajarito Plateau and Perage in the Rio Grande Valley contributed to the growth and development of the early Tewa cultural landscape and contemporary San Ildefonso Pueblo.

The Rising Scholars seminars are opportunities to learn from students and early career archaeologists as they share their current research or emerging methods and theories.

Teresa L. Gregory, MS, Statistical Research, Inc.

Teresa Gregory received a BA in Cultural Anthropology/Archaeology from UC Santa Barbara in 1996, a BS in Molecular & Cellular Biology from U.Arizona in 2001, and a MS in GIST from U. Arizona in 2016. She worked as a field archaeologist in CRM for four years before moving into basic research and "molecular" archaeology. In 2015, she became the Administrator of the ASM/Archaeological Records Office and GIS Manage of AZSITE updating and improving the GIS platform for the archaeological community and incorporating her knowledge of Esri ArcGIS products, Python, SQL, GPS collection devices and many other facets of a well-rounded GIS professional. In 2017, Teresa moved to a private CRM firm, Statistical Research, and began assisting the Arizona Army National Guard/Arizona Department of Emergency and Military Affairs modifying a suite of Esri-based tools, WebApps, and geodatabases in the Microsoft Azure Government Cloud to aide in project planning and mission readiness.

In this course, the instructor will introduce real world examples of GIS platforms and applications that benefit the study of cultural and natural resources. Attendees will learn about cutting-edge Esri GIS software (ArcGIS Pro, Enterprise, AGOL, Monitor, Survey123) for data collection and manipulation; Adobe Acrobat/Sign for reviewing and signing documents; Python (ArcPy) for coding and creating more efficient GIS tools; Microsoft Azure Government Cloud Server for data storage; and much more. These products can aide archaeologists in smaller, simple projects or multi-scalar larger projects. GIS can be enjoyable and helpful from start to finish for archaeological projects.

1. Describe what ArcGIS Pro is and how to use it, as well as other useful software
2. Explore how GIS can aide the study of cultural and natural resources
3. Explain, with examples, how to store, retrieve, and integrate GIS data

Christopher Dore, PhD, RPA, Heritage Business International

Dr. Dore has conducted archaeological expert witness work for over 20 years as a part of his work portfolio. He is a Certified Forensic Litigation Consultant, a professional member of the Forensic Expert Witness Association (FEWA), and the vice-president of FEWA’s southwest region. Dr. Dore is a co-author of the SAA’s Professional Standards for the Determination of Archaeological Value and has published in legal journals. He has served as an expert witness on high-profile cases nationally that have included criminal looting and artifact trafficking, but also fraud, insurance claims, hazardous waste liability, professional qualifications and performance, and plagiarism.

Applying one’s archaeological expertise to the legal system as an expert witness is rewarding and provides the potential to assist in site protection. However, the legal system operates under a different set of rules and practices. Archaeologists often take on their first job as an expert witness without understanding the context, role, and rules of a legal expert. Without this understanding, archaeologists often end up having a stressful and unrewarding experience, being ineffective, and could have their professional reputations damaged. This seminar provides an introductory overview of the basic information need to successfully transfer one’s skills as an archaeological expert to those of an effective archaeological expert witness. Topics include qualifications, rules of evidence, contracts, best practices, marketing, reporting, communication, testimony, and ethics.

1. Describe the basic framework of the U.S. legal system and the role of an expert witness
2. Explain the key federal rules that qualify an expert witnesses and that expert witnesses must follow in their work
3. Illustrate what archaeologists do as expert witnesses
4. Provide attendees with the information to decide if expert work is for them
5. Explore where to go to learn more