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Paleobiological And Paleoclimatological Significance Of Stable Isotope Patterns Across Early Eocene Hyracotherium Tooth Rows, Abigail R. D'Ambrosia
Paleobiological And Paleoclimatological Significance Of Stable Isotope Patterns Across Early Eocene Hyracotherium Tooth Rows, Abigail R. D'Ambrosia
Master's Theses and Capstones
The main objective of this study was to determine the most reliable teeth in early Eocene Hyracotherium fossil tooth rows for paleoclimate reconstruction using delta18O values preserved in the tooth enamel. Specimens came from two localities within the Bighorn Basin of Wyoming, D-1204 and D-1583. ANOVA and T-test results generally indicate non-significant differences in mean and variance across tooth rows consisting of m/1, m/2, p/4, and m/3 adult teeth, suggesting any of these teeth may be used for paleoclimate reconstruction purposes as long as sample sizes are large. Additionally, two distinct isotopic patterns were observed across tooth rows, possibly representing …
Recent Extreme Events In A Tropical Stalagmite: Multi-Proxy Records And Analysis Of Ecosystem Delta Carbon-13 Value Sensitivity To Weak Climate Forcing, Amy E Benoit Frappier
Recent Extreme Events In A Tropical Stalagmite: Multi-Proxy Records And Analysis Of Ecosystem Delta Carbon-13 Value Sensitivity To Weak Climate Forcing, Amy E Benoit Frappier
Doctoral Dissertations
Speleothems are emerging as important and detailed chronological records of environmental change. Integrating exploration of modern speleothem records of environmental variability, related forcing factors, and understanding and suggests new potential proxies. This dissertation demonstrates the potential for developing novel proxy records of past regional environmental extremes, such as tropical cyclones, explosive volcanism, and enhanced seasonal contrasts from speleothems that are sensitive to transient infiltration events through very high-resolution, multi-parameter analysis of a rapidly growing, fracture-fed tropical stalagmite. A series of sample screening steps were developed prior to stalagmite collection in the field in order to increase the likelihood of collecting …