The geology of the Skowhegan Quadrangle, Maine.

Thesis (Ph.D.)--Boston UniversityThe Skowhegan quadrangle includes approximately 21.5 square miles of Somerset County in central Maine. This geological study includes sedimentary, igneous, and metamorphic petrology, stratigraphy, structure, and geomorphology. The metasedimentary rocks that comprise most of the quadrangle are impure quartzites, black, gray, or green phyllites and slates, and some impure limestones. [TRUNCATED

Particle Trajectories for Quantum Maps

We study the trajectories of a semiclassical quantum particle under repeated indirect measurement by Kraus operators, in the setting of the quantized torus. In between measurements, the system evolves via either Hamiltonian propagators or metaplectic operators. We show in both cases the convergence in total variation of the quantum trajectory to its corresponding classical trajectory, as defined by propagation of a semiclassical defect measure. This convergence holds up to the Ehrenfest time of the classical system, which is larger when the system is less chaotic. In addition, we present numerical simulations of these effects.Comment: 35 pages, 7 figure

The Ice Age Trail in Maine: An Experience for Geo/Eco-travelers

This project will design and produce 200,000 copies of an Ice Age Trail map that interprets for informal learners (tourist travelers, local residents, school students) the late Quaternary history of eastern coastal Maine, glaciated North America and the north Atlantic region. The map will lead geo/eco-travelers along public roads to critical stops where they can observe glacial, glaciomarine and vegetation features, as well as historical and human events described and interpreted on the map in photos, diagrams and text. The travelers will be drawn from the approximately 4 million visitors to Maine\u27s coastal state and national parks. Additional dissemination will be via web cast through at least five separate websites. Maine Ice Age Map and Guide: Down Eas

Collaborative Research: West Antarctic Ice Sheet Stability: The Glacial Geologic Record from the Ohio Range of the Horlick Mountains in the Bottleneck

This award supports a project to document former high stands and assess the stability of the West Antarctic ice sheet (WAIS) at the Ohio Range near the head of Mercer Ice Stream (formerly Ice Stream A). The field location is situated in the Bottleneck , a unique, relatively narrow passage in the Transantarctic Mountains connecting the West and East Antarctic ice sheets. The location lies near the ice divide and is thus well situated to determine past interior ice elevation. The research will involve geologic mapping of glacial deposits and erosion features combined with cosmogenic surface exposure dating on the Ohio Range nunataks to determine the chronology of past higher ice sheet levels and local glacier fluctuations. Exposure ages of fresh glacial erratics, up to 60 m above the present ice level will be used to constrain the timing of the last high stand and subsequent draw down of the WAIS in this sector. Exposure ages of debris bands on the ice sheet surface will constrain the duration of continuous ice cover near the present elevation. A complimentary local proxy climate record will also be obtained from a chronology of the local glacier moraines. Data obtained from the proposed research will contribute to the development of time-dependent, non-equilibrium models of the WAIS, at and since the last glacial maximum 20,000 years ago, a major objective of the West Antarctic Ice Sheet Initiative. Age control on ice sheet elevation from this key location, near the head of the Mercer Ice Stream, will complete chronologic coverage extending from the ice age terminus in the Ross Sea, through McMurdo Sound and the southern Transantarctic Mountains, to the onset area near the ice divide. In addition, the glacial geologic record in the Bottleneck will reflect the history of the interaction of WAIS and EAIS, which could be used to test hypotheses of Pleistocene collapse of the WAIS. The future behavior of the WAIS is of significant interest to society because of its linkage to sea level. Melting of Antarctic ice sheets would raise sea levels, negatively impacting the large portion of the human population living near the world\u27s coasts. The research is designed to provide necessary data on the past history of the WAIS to the ice sheet modeling community in order to accurately predict the future behavior of the ice sheet. In addition, the proposed research incorporates both graduate and undergraduate student education and involves them in research with goals that are of societal significance

Late-Glacial Stratigraphy of the Kennebec River Valley From Norridgewock to Solon, Maine

Guidebook to field trips in southern Maine; 57th meeting, October 8-10, 1965, held at Bowdoin College: Trip

Hudson Museum Collection: Byrd\u27s Second Antarctic Expedition, 1933-1935

Dr. Harold Borns, Professor Emeritus at the University of Maine Climate Change Institute, narrates original footage of Richard E. Byrd\u27s second Antarctic expedition, 1933-1935. The footage was filmed by John L. Herrmann of Paramount Pictures. The original footage presented was transferred from 16mm film in January 2002 by Northeast Historic Film in Bucksport, Maine, and narration by Dr. Harold Borns added in August 2014. The original film footage is held by the Hudson Museum, University of Maine.https://digitalcommons.library.umaine.edu/umaine_video/1025/thumbnail.jp