Leland is a Geologist with the U.S. Geological Survey’s Geosciences and Environmental Change Science Center in Denver, Colorado.
Leland’s broad interests include how the spatial and temporal evolution of Earth’s subsurface influences the distribution of natural resources. More specifically, he is interested in synthesizing and interpreting wide varieties of data and field observations into robust subsurface models applicable to characterizing mineral deposits, energy or groundwater reservoirs, and natural hazards. Leland currently works with the National Geologic Synthesis Project developing a 3D subsurface model of the contiguous United States.
Prior to the USGS, Leland worked in a variety of industry roles including geotechnical engineering, hydrocarbon exploration, and Intrusion-Related / Carlin-type gold exploration from Southern Rocky Mountain basins to the Sierra Nevada. In 2019 he received his B.Sc. in Geological Engineering from the Colorado School of Mines, and in 2021 received an M.Sc. in Geological Sciences from the University of Texas at Austin where he was a Research Assistant with the Reservoir Characterization Research Laboratory.
Professional Experience
Geologist – USGS (2022-Present)
Exploration Geologist – Barrick Gold Exploration (2021-2022)
Exploration Geology Intern – Nevada Gold Mines (2021)
Research Assistant – RCRL, Bureau of Economic Geology (2019-2021)
Exploration Geology Intern – EOG Resources (2019)
Student Guide – CSM Geology Museum (2016-2019)
Geotechnical Engineering Intern – CDOT (2016)
Education and Certifications
M.Sc. Geological Sciences – The University of Texas at Austin (2021)
B.Sc. Geological Engineering – Colorado School of Mines (2019)
Science and Products
National Geologic Synthesis
Digital database of structure contour and isopach maps of multiple subsurface units, Michigan and Illinois Basins, USA
Digital subsurface database of elevation point data and structure contour maps of multiple subsurface units, Powder River Basin, Wyoming and Montana, USA
Digital database of the previously published Geologic map of the Limon quadrangle, Colorado and Kansas
Progradational-to-retrogradational styles of Palaeogene fluvial fan successions in the San Juan Basin, New Mexico
Science and Products
- Science
National Geologic Synthesis
The National Cooperative Geologic Mapping Program (NCGMP) Strategic Plan of 2020 calls for the creation of a “variable-scale, national, integrated 2D and 3D geologic-framework model that enables the seamless construction of geologic maps within user-defined regions of interest across the United States by the year 2030” (USGS Open-File Report 2021-1013*). Congress recently directed NCGMP to “bring... - Data
Digital database of structure contour and isopach maps of multiple subsurface units, Michigan and Illinois Basins, USA
This digital data release presents contour data from multiple subsurface geologic horizons as presented in previously published summaries of the regional subsurface configuration of the Michigan and Illinois Basins. The original maps that served as the source of the digital data within this geodatabase are from the Geological Society of America’s Decade of North American Geology project series, “TDigital subsurface database of elevation point data and structure contour maps of multiple subsurface units, Powder River Basin, Wyoming and Montana, USA
This digital data release presents subsurface data from multiple geologic units that were part of a previous study of the regional subsurface structural configuration of the Powder River Basin in Wyoming and Montana. The original data within this geodatabase is sourced from an unpublished doctoral dissertation by Jessie Melick at Montana State University (Melick, 2013). Data contained in this releDigital database of the previously published Geologic map of the Limon quadrangle, Colorado and Kansas
This digital data release contains geospatial geologic and paleontological data of the 1° x2 °, 1:250,000 Limon quadrangle covering eastern Colorado and western Kansas. The dataset is a digital reproduction of previously published U.S. Geological Survey field mapping which illustrates the spatial configuration of primarily Quaternary surficial units overlying upper Miocene, Oligocene, Paleocene, a - Publications
Progradational-to-retrogradational styles of Palaeogene fluvial fan successions in the San Juan Basin, New Mexico
Basin-scale outcrop analyses of fluvial architecture in the Palaeogene San Juan Basin, New Mexico, document lateral and vertical trends in channel, floodplain and palaeosol characteristics. Herein, the uppermost part of the Palaeocene Nacimiento Formation and lower Eocene Cuba Mesa and Regina Members of the San Jose Formation are identified as deposits of large fluvial fans based on trends observeAuthorsKristine L. Zellman, Piret Plink-Bjorklund, Leland Robson Spangler