Research Geologist—Professor
Phone: (406) 496-4177
Email: jlonn@mtech.edu
MBMG—Butte
1300 West Park Street
Butte, MT 59701
Jeff has spent 30 years mapping the Mesoproterozoic Belt Supergroup and related Lemhi Group in western Montana and east-central Idaho. Other research interests include structure and tectonics of the northern Rocky Mountains, and Cenozoic geology and neotectonics of the Bitterroot Valley.
| Date | Citation |
|---|---|
| 7/28/2017 | Lonn, J., 2017, The Proterozoic Lemhi Group: Presented at the Field Conference, Tobacco Root Geological Society, Leadore, Idaho, July 28, 2017. |
| 5/19/2016 | Lonn, J., Burmester, R.F., Lewis, R.S. and McFaddan M.D., 2016, Mesoproterozoic Lemhi Strata Represent Immense Alluvial Aprons That Prograded Northwest into the Belt Sea, Idaho and Montana: Presented at the 2016 Geological Society of America Rocky Mountain Section Meeting, Moscow, Idaho, May 19, 2016. |
| 5/20/2014 | Lonn, J., 2014, The Northern Extent of the Mesoproterozoic Lemhi Group, Idaho and Montana, and Stratigraphic and Structural Relations with Belt Supergroup Strata: Presented at the Geological Society of America Rocky Mountain and Cordilleran Joint Meeting, Bozeman, Montana, May 20, 2014. |
| 5/9/2013 | Lonn, J., 2013, Giant Folds and Complex Faults within Proterozoic Lemhi Subbasin Strata, Beaverhead Mountains, Montana and Idaho: Presented at the Montana Bureau of Mines and Geology, Butte, Montana, May 9, 2013. |
| Year | Citation |
|---|---|
| 2024 | Lonn, J.D., Elliott, C.G., Burmester, R.F., and Lewis, R.S., 2024, Geologic map of the Big Hole Pass 7.5' quadrangle, southwestern Montana and eastern Idaho: Montana Bureau of Mines and Geology Geologic Map 94, 1 sheet, scale 1:24,000. |
| 2023 | Gavillot, Y., Lonn, J., Stickney, M., and Hidy, A., 2023, Quaternary slip rates and most recent surface rupture of the Bitterroot fault, western Montana: Montana Bureau of Mines and Geology Bulletin 142, 44 p. |
| 2022 | Lonn, J.D., and Gavillot, Y.G., 2022, Geologic map of the southern Bitterroot fault, Bitterroot Valley, western Montana: Montana Bureau of Mines and Geology Geologic Map 83, 1 sheet, scale 1:24,000. |
| 2022 | Lonn, J.D., and Scarberry, K.C., 2022, Geologic map of the Odell Lake 7.5' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Geologic Map 86, 1 sheet, scale 1:24,000. |
| 2021 | Lonn, J.D., Burmester, R.F., Lewis R.S., and McFaddan, M.D., 2021, The Mesoproterozoic Belt Supergroup: Montana Bureau of Mines and Geology Special Publication 122: Geology of Montana, v. 1, chapter 1, 38 p., available online |
| 2020 | Lonn, J., 2020, Geologic map of the south half of the Shaw Mountain 7.5' quadrangle, southwestern Montana, Montana Bureau of Mines and Geology Geologic Map 78, scale 1:24,000, Beaverhead County, Montana, June 18, 2020. |
| 2020 | Lonn, J., English, A., McDonald, K., and Hargrave, P. (eds.), 2020, Geology of the Bitterroot region and other papers: Tobacco Root Geological Society Northwest Geology 49, Granite, Missoula and Ravalli Counties, August 3, 2020. |
| 2020 | McDonald, K., Mosolf, J., Vuke, S., and Lonn, J., 2020, Geologic map of the Elliston 30′ x 60′ quadrangle, west-central Montana, Montana Bureau of Mines and Geology Geologic Map 77, scale 1:100,000, Lewis and Clark and Powell Counties, Montana, April 13, 2020. |
| 2019 | Lonn, J., 2019, 2020 MBMG Calendar: Trapper Peak, Bitterroot Mountains: MBMG Miscellaneous Publications and Maps 67, Butte, Montana, 2019. |
| 2019 | Lonn, J., Elliott, C., Lewis, R., Burmester, R., McFaddan, M., Stanford, L., and Janecke, S., 2019, Geologic Map of the Montana part of the Salmon 30' x 60' quadrangle, Southwestern Montana: Montana Bureau of Mines and Geology Geologic Map 75, 28 p., 1 sheet, scale 1:100,000, Butte, Montana, 2019. |
| 2019 | Lonn, J., Elliott, C., Stewart, D., Mosolf, J., Burmester, R., Lewis, R., and Pearson, D., 2019, Geologic Map of the Bannock Pass 7.5' Quadrangle, Beaverhead County, Montana, and Lemhi County, Idaho. MBMG Geologic Map 76, 1 sheet, scale 1:24,000, Butte, Montana, 2019. |
| 2019 | Lonn, J.D., 2019, 2020 MBMG Calendar: Trapper Peak, Bitterroot Mountains: Montana Bureau of Mines and Geology Miscellaneous Publications and Maps 67. |
| 2019 | Lonn,J.D., Elliott, C.G., Lewis, R.S., Burmester, R.F., McFaddan, M.D., Stanford, L.R., and Janecke, S.U., 2019, Geologic map of the Montana part of the Salmon 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Geologic Map 75, 28 p., 1 sheet, scale 1:100,000. |
| 2018 | Stickney, M.C, and Lonn, J.D., 2018, Investigation of Late Quaternary Fault Scarps along the Bitterroot Fault in Western Montana: Montana Bureau of Mines and Geology Report of Investigations 24, 16 p., 2 map sheets. |
| 2017 | Lonn, J., 2017, The Lemhi Group revisited and revised, east-central Idaho: Northwest Geology, v. 46, p. 15-28. |
| 2017 | Lonn, J.D. and Elliott, C.G., 2017, Geologic map of the Stine Mountain 7.5' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Geologic Map 69, 1 sheet, scale 1:24,000. |
| 2017 | Lonn, J.D., 2017, Geologic map of part of the Lick Creek 7.5' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 690, 1 sheet, scale 1:24,000. |
| 2016 | Burmester, R.F., Lonn, J.D., Lewis, R.S., and McFaddan, M.D., 2016, Stratigraphy of the Lemhi Subbasin of the Belt Supergroup: in MacLean, J.S., and Sears, J.W., eds., Belt Basin: Window to Mesoproterozoic Earth: Geological Society of America Special Paper 522, Chapter 1, 20 p. |
| 2016 | Lonn, J.D., Burmester, R.F., Lewis, R.S., and McFaddan, M.D., 2016, Giant folds and complex faults in Mesoproterozoic Lemhi Strata of the Belt Supergroup, Northern Beaverhead Mountains, Montana and Idaho: in MacLean, J.S., and Sears, J.W., eds., Belt Basin: Window to Mesoproterozoic Earth: Geological Society of America Special Paper 522, Chapter 12, 24 p. |
| 2015 | Burmester, R.F., Lewis, R.S., Lonn, J., and McFaddan, M.D., 2015, The Hoodoo is the Swauger and Other Heresies: Lemhi Subbasin Correlations and Structures, East-Central Idaho: Northwest Geology, v. 44, p. 73-88. |
| 2015 | Lonn, J., 2015, Geologic Field Guide to the Cherry Creek Fault, A Possible Proterozoic Fault Near Helena, Montana: Northwest Geology, v. 44, p. 189-194. |
| 2015 | McDonald, C., Lonn, J., Vuke, S., and Mosolf, J., 2015, Field Trip to the Nevada Lake Breccias, Powell County, Montana: Northwest Geology, v. 44, p.137-144. |
| 2015 | McDonald, C., Mosolf, J., Lonn, J., and Vuke, S., 2015, Geologic Summary of the Elliston 30' x 60' Quadrangle, West-Central, Montana: Northwest Geology, v. 44, p. 9-18. |
| 2013 | Burmester, R.F., Lonn, J.D., Lewis, R.S., and McFaddan, M.D., 2013, Toward a Grand Unified Theory for Stratigraphy of the Lemhi Subbasin of the Belt Supergroup: Northwest Geology, v. 42, p. 1-20. |
| 2013 | Burmester, R.F., McFaddan, M.D., Lewis, R.S., and Lonn, J.D., 2013, What's the Swauger Formation Doing in the Eastern Salmon River Mountains, Idaho?: Northwest Geology, v. 42 p. 187. |
| 2013 | Lonn, J.D., Lewis, R.S., and Burmester, R.F., 2013, Geologic Field Guide to the Freeman Creek Area Near Salmon, Idaho: Northwest Geology, v. 42, p. 199-204. |
| 2013 | Lonn, J.D., Lewis, R.S., Burmester, R.F., and McFaddan, M.D., 2013, Geologic Field Guide to the Trail Gulch Area Near North Fork, Idaho: Northwest Geology, v. 42, p. 205-214. |
| 2013 | Lonn, J.D., Lewis, R.S., Burmester, R.F., and McFaddan, M.D., 2013, The Complex Structural Geology of the Northern Beaverhead Mountains, Montana and Idaho: Northwest Geology, v. 42, p. 111-130. |
| 2013 | Lonn, J.D., Othberg, K.L., Lewis, R.S., Burmester, R.F., Stanford, L.R., and Stuart, D.E., 2013, Geologic Map of the North Fork 7.5' Quadrangle, Lemhi Country, Idaho: Idaho Geologic Survey Digital Web Map 160, scale 1:24,000. |
| 2013 | McDonald, C., and Lonn, J., 2013, Revisions of Mesoproterozoic and Cambrian Stratigraphy in the Pioneer and Highland Mountains, Southwestern Montana, and Resulting Implications for the Paleogeography of the Belt Basin: Northwest Geology, v. 42, p. 93-101. |
| 2011 | Lonn, J.D., 2011, Belt Rocks and Structures of the Lewis and Clark Line in Alberton Gorge, Western Montana: A River Log: Northwest Geology, v. 40, p. 105. |
| 2010 | McDonald, C., and Lonn, J. , 2010, Lewis and Clark Line, Montana: Tectonic Evolution of a Crustal-Scale Flower Structure in the Rocky Mountains: GSA Field Guides, v. 18, p. 1-20. |
| 2009 | Lonn, J., and Lewis, R., 2009, Late Cretaceous Extension and its Relation to the Thin Stratigraphic Section in the Philipsburg Area: A Field Trip to Carpp Ridge: Northwest Geology, v. 38, p. 141-152. |
| 2006 | Hargrave, P., Cox, B., and Lonn, J.D., 2006, The Trip to Leigh Lake: Belt Rocks, Big Faults, and Small Mines in the High Cabinet Mountains, Northwestern Montana: Northwest Geology, v. 35, p. 91-96. |
| 2004 | O’Neill, J.M., Lonn, J.D., Lageson, D.R., and Kunk, M.J., 2004, Early Tertiary Anaconda Metamorphic Core Complex, Southwestern Montana: Canadian Journal of Earth Science, v. 41, p. 63-72. |
| 2003 | Lonn, J.D., Lewis, R.S., and Winston, D., 2003, Belt Structure and Stratigraphy on the Sapphire Block, Western Montana: Northwest Geology, v. 32, p. 17-28. |
| 1995 | Marvin, R.K., Metesh, J.J., Lonn, J.D., Madison, J.P., and Wintergerst, R., 1995, Abandoned-Inactive Mines Program in the Deerlodge National Forest: Volume III: Flint Creek and Rock Creek Drainages, Final Report to U.S. Department of Agriculture, USFS, p. 173. |
| 1995 | Metesh, J.J., Lonn, J.D., Duaime, T.E., Marvin, R.M., and Wintergerst, R., 1995, Abandoned-Inactive Mines in the Deerlodge National Forest: Volume II: Cataract Creek Drainage, Final Report to U.S. Department of Agriculture, USFS, p. 163, May 1995. |
| 1994 | Metesh, J.J., Lonn, J.D., and Hall, J.G., 1994, GIS Analysis: Geology-Land Type Associations, Basin and Cataract Creek Drainages, Final Report to USDA Forest Service, 14 p. |
| 1988 | Winston, D. and Lonn, J., 1988, Structural Geology and Belt Stratigraphy of the Tarkio Area, Montana: in R. M. Weidman, ed. Guidebook to the Greater Missoula Area: Tobacco Root Geological Society 13th Annual Field Conference, p. 1–34. |
| 1984 | Lonn, J., 1984, Geometry of the Western Montana Thrust Belt Near Tarkio: Northwest Geology v. 13, p. 25–31. |