The following is a list of senior thesis research projects directed or co-directed by Professor Johnson in the Environmental Geochemistry Laboratory.


Barry, C. (Honors in Geology, 2012). A study of the impact of ditch-plug alteration on the hydrogeology of the Sprague River Marsh, Phippsburg, Maine

Lindelof, J.A. (Honors in Geology, 2012). Using sedimentary and geochemical proxies for Little Ice Age climate change reconstructions, south mainland Shetland

Sonshine, E. (Geology, 2012).  The characterization of organic carbon in sedimentary cores from Zostera marina beds, Maquoit Bay, Maine


Flynn, G. (Honors in Geology, 2011). Nitrogen isotopes in Zostera marina: a potential indicator of anthropogenic nutrient loading in Casco Bay, Gulf of Maine.

Harris, C. (Honors in Biology, 2011). Stable Isotopic Shifts in Fish Bones From Multiple Archeological Coastal Middens in Penobscot Bay, Maine.  Co-Adviser = Will Ambrose.

Knowles, I. (Honors in Geology, 2011). A Biogeochemical Study of Ditchplug and Natural Pools in the Sprague River Marsh, Phippsburg, ME.

Wool, D., (Geology, 2011).  Nitrogen isotopes in lake sediments from the Androscoggin watershed: a proxy for anadromous fish runs?


Ms. Elyse Judice (Environmental Studies):  Stable isotope analysis of Fundulus Heteroclitus and the effectiveness of ditch-plug restoration at the Sprague River Salt Marsh, Phippsburg, Maine. Advisor: Johnson

Mr. William (aka Dots) Loopesko (Geology, Honors):  Zostera marina as a proxy for anthropogenic nitrogen enrichment in Casco Bay, Maine. Advisor: Johnson


Mr. Dylan Eberle (Geology): A 300 year record of lead deposition at Taylor Pond, Auburn, Maine. (Honorable Mention for Undergraduate Student Poster Competition at NE-GSA, Buffalo, March 2008; 5 awards made out of 132 posters)

Mr. Greg Henkes (Biology): Mineral and isotopic geochemical evidence for environmental change in the shells of the smooth Greenland cockle, Serripes groenlandicus, from the Barents Sea (co-advised with Will Ambrose).


Mr. Carl Noblitt (Geology): Stable carbon and nitrogen isotopes in mollusk tissue and shell organic matter: potential tracers of primary production in the nearshore Gulf of Maine.


Ms. Erin Beirne (Geology, Honors), 2005. A Geochemical Investigation of Organic Matter Composition, Deposition, and Preservation at Sprague Marsh, Phippsburg, Maine.

Mr. Morey Hallett (Geology), 2006. A 4,000 Year Record of Relative Sea Level Rise and Carbon Sequestration in the Webhannet Marsh, Wells, Maine.

Mr. Seth Hubbard (Geology), 2006. A Recent History of Lead and Zinc Deposition in Four Maine Lakes.

Ms. Hallie Preston (Environmental Studies) 2006. Phosphorus Cycling in the Gulf Island Pond.


Ms. Kim Rodgers (Geology), 2005. Stable Carbon Isotope Analysis of Lake Core Sediments and Lipid Biomarkers as a Proxy for Late Pleistocene Carbon Cycling at Elikchan Lake, NE Siberia

Mr. Daniel Frost (Geology), 2005. Paleoclimate Reconstruction Using Physical Sedimentology and Organic Matter Biogeochemistry of Varved Sediments, Basin Pond, Fayette, ME (co-advised with Mike Retelle)

Mr. Kelton McMahon (Biology, Honors), 2005. Impacts of a Changing Food Supply on Arctic Benthos: Digestibility of Ice Algae and Phytoplankton (co-advised with Will Ambrose)


Ms. Anna Felton (Geology, Honors): Organic Carbon Cycling in Laminated Sediments from Coastal Lacustrine and Marine Environments, Eastern Canadian Arctic.

Ms. Karen Moore (Geology): Investigation of Terrestrial Organic Carbon Cycling in Maine Coastal Environments through the last 3,000 Years.

Ms. Rachel Booty (Environmental Studies): Soil Lead Determinations inThree Urban Community Gardens, Lewiston, Maine


Ms. Nicole Ouellette (Geology, Honors): Lipid Biomarkers and Paleovegetation eterminations of the last 30,000 Years at Elikchan Lake, Northeast Siberia.

Mr. Jeff Burnap (Environmental Studies ‘03): Soil Quality: An Investigation atWillow Pond Farm


Ms. Elizabeth Miller (Geology): A Study of the Surface Textures and Morphology of Quartz Grains Taken From the Northern Dune at the Wolfe Creek Crater, Western Australia.

Ms. Bethany Thienel (Geology, Honors): Potential Remediation of Cu(II) and Zn(II) by Sorption on Aspen Wood Wool.

Mr. Andrew Wilkie (Environmental Studies): A Modern Ecological Survey of the Wolfe Creek Crater Meteorite Impact Crater, NW Australia.