Courses that I teach

• GEOL 05: Geology of Mexico
• GEOL 07: Natural Disasters
• GEOL 10: Physical Geology
• GEOL 10L: Physical Geology Lab
• GEOL 100: Mineralogy
• GEOL 125: Metallic Ore Deposits

Publications

Hammersley, L., Levine, R., Cornwell, K., Kusnick, J., & Hausback, B.P., 2012, The Geology of Mexico: A quantitative evaluation of a course deigned to increase the number of Hispanic students participating in the geosciences at California State University, Sacramento, Journal of Geoscience Education, 60, 189-198.

Plummer, C., Carlson, D., & Hammersley, L., Physical Geology (14th Edition), McGraw-Hill, 2012.

Blatter, D. & Hammersley, L., 2010, Impact of the Orozco Fracture Zone on the central Mexican Volcanic Belt, Journal of Volcanology and Geothermal Research, 197, 65-84

Plummer, C., Carlson, D., & Hammersley, L., Physical Geology (13th Edition), McGraw-Hill, 2009.

Carlson, D., Plummer, C., & Hammersley, L., Physical Geology, Earth Revealed (9th Edition), McGraw-Hill, 2010.

Hammersley, L. & DePaolo, D.J., 2006, Isotopic and geophysical constraints on the structure and evolution of the Clear Lake volcanic system. Journal of Volcanology and Geothermal Research, 153, 331-356

Abstracts

Alpers, C.N., Mitchell, V.L., Basta, N.T., Casteel, S.W., Foster, A.L., Blum, A.E., Kim, C.S., Myers, P., Burlak, T.L., and Hammersley, L., 2012, Evaluating the bioavailability, bioaccessibility, mineralogy, and speciation of arsenic in mine waste and soils. Empire Mine low-sulfide gold-quartz vein deposit, Nevada County, California,  U.S. Environmental Protection Agency Hardrock Mining Conference, Denver, CO, April 3–5, 2012 

Alpers, C.N., Burlak, T., Foster, A., Hammersley, L., and Petersen, E., 2011, Mineralogy and speciation of arsenic in weathered waste rock from the Empire mine low-sulfide gold-quartz vein deposit, California. Annual Meeting of the National Association of Abandoned Mine Land Programs, Squaw Valley, CA, October 10–12, 2011.

Burlak, T., Alpers, C.N., Foster, A.L., Brown, A., Hammersley, L., & Peterson, E., 2010, Tracking the mineralogical fate of arsenic in weathered sulfides from the Empire Mine gold-quartz vein deposit by using microbeam analytical techniques, AGU Annual Fall Meeting.

Hammersley, L. & Blatter, D.L., 2009, Impact of the Orozco Fracture Zone on the central Mexican Volcanic Belt, AGU Annual Fall Meeting.

Hammersley, L. & Biskowski, M., 2008, Source characterization of stone grinding tools from the Teotihuacan Valley, Mexico, Abstracts with Programs, Geological Society of America. Vol. 40.

Hammersley, L., Kusnick, J., Cornwell, K. & Hausback, B., 2008, Attracting Hispanic students to the Geosciences through the development of introductory level Geology of Mexico and Mexico Field Trip courses and collaboration with minority-serving groups on campus, Abstracts with Programs, Geological Society of America. Vol. 40.

Stout, C.M., Hammersley, L. & Clynne, M.A., 2007, Field measurements of mafic enclave population density at Chaos Crags, Lassen Volcanic National Park, CA and implications for magma mixing. GSA Abstracts with Programs, Cordilleran Section.

Blatter, D.L. & Hammersley, L., 2006. A gap in the central Mexican volcanic belt: A result of shallow subduction of the Orozca fracture zone? Geological Society of America, Backbone of the Americas - Patagonia to Alaska

Hammersley, L. & DePaolo, D.J., 2004, Isotopic and geophysical constraints on the structure and evolution of the Clear Lake volcanic field, Geological Society of America Abstracts with Programs, Vol. 36, No. 5, p247

Hammersley, L. & DePaolo, D.J., 2002, Oxygen Isotope Evidence for the Role of Crustal Contamination in the Evolution of the Chalupas Caldera System, Northern Andes, Ecuador, AGU Annual Fall Meeting.

Hammersley, L. & DePaolo, D.J., 2001. Two-stage AFC-FC model for the evolution of large-volume rhyolitic ignimbrites (LRI’s), AGU Annual Fall Meeting.

Hammersley, Lisa., Feineman, Maureen D., Bryce, Julia G., and Carmichael, Ian S.E., 2001, A wet volcanic front in Mexico: The source of hydrous intermediate lavas, GSA Annual Meeting.

Feineman M.D., Hammersley L., Bryce J.G. and Carmichael I.S.E., 2001, Compositional consequences of lawsonite breakdown in regions of warm subduction, GSA Annual Meeting.

Hammersley, L., DePaolo, D.J. & Beate, B., 2001, Development of Large-Volume rhyolitic ignimbrites (LRI’s): Chalupas caldera, Ecuador, III South American Symposium on Isotope Geochemistry.

Hammersley, L., DePaolo, D.J. & Beate, B., 2000, Chalupas Caldera, Ecuador: A study of the development of a large volume rhyolite system in the northern Andes, IAVCEI General Assembly.

Hammersley, L. & DePaolo, D.J., 1999, Magma recharge and crustal assimilation in the evolution of the Clear Lake volcanic field, CA: An isotopic study, GSA Annual Meeting.

Research Projects/Interests

I am interested in the evolution of magma as it travels from the source to the surface. In particular I am interested the process of magma mixing. I the texture and geochemistry of lavas to understand the source of the magma and the magmatic processes invovled in its evolution. I have studied volcanic system in Ecuador, Mexico, and northern California. 

I am also interested in the application of geological techniques to archeological studies. I have been working on stone griding tools from the Teotihuacan Valley, Mexico to identify the source of the materials and examine production and trade patterns.

Recent Projects:

• Using diffision profiles across host-mafic enclave interfaces in lavas from Clear Lake to understand the timescale of magma mixing
• Field and textural studies of magma mixing processes at Chaos Crags, Lassen Volcanic National Park
• Determining the cause of a large gap in the volcanic front of the Mexican Volcanic Belt
• Tracing the fate of arsenic in weathered sulfides from Empire Mine
• Sourcing of stone grinding tools from Teotihuacan Valley, Mexico
• Using isotope geochemistry to understand the structure of the magmatic system at the Clear Lake volcanic field

Professional Associations

• American Geophysical Union
• Geological Society of America
• National Association of Geoscience Teachers
• California Mineral Education Foundation

The sun sets over Eagle Lake, northern California

Wild horses walk through early morning frost in the Chalupas caldera, Ecuador. Volcan Quilindana sits in the background.

A chain of cinder cones in the Mexican Volcanic Belt

Photomicrograph of a zoned plagioclase crystal from an andesite collected from the Chalupas caldera in Ecuador.