ISOTOPIC AND ELEMENTAL ANALYSIS OF THE ANTHROPOGENIC IMPACT IN FARMINGTON BAY
Initial results from these 210Pb isotopes have allowed ages to be assigned to depths along the core dating back roughly 100 years at 30 cm. At this depth, a dramatic shift in the δ15N isotope is observed. Initial δ15N levels indicated a nutrient source related to agriculture. However, beginning around 100 years ago, the δ15N shows the main nutrient source for the bay became wastewater. This may have been a result of the completion of a sewage canal in 1911 which began routing wastewater directly into the bay. A disappearance of diatoms at this time also indicates a major environmental shift related to this canal. Results have also shown a significant rise in phosphorus levels beginning around 1970 which may be due to the construction of the automobile causeway that isolated Farmington Bay from the rest of the Great Salt Lake.