Thèse (M.A.Plas.) -- Université du Québec à Chicoutimi, 2003. / Bibliogr.: f. 41. Document électronique également accessible en format PDF. CaQCU

Thesis (M. Sc.)--University of Alberta, 2009. / Title from pdf file main screen (viewed on July 16, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Geophysics, Department of Physics, University of Alberta." Includes bibliographical references.

Thesis (M.S.)--Mississippi State University. Department of Mechanical Engineering. / Title from title screen. Includes bibliographical references.

Thesis (doctoral)--University of Tartu, 2008. / Vita. Includes bibliographical references.

New technologies are continuously being developed that can aid us in archaeological research. The purpose of this project is to revisit an area containing Late Iron Age (LIA) Stone Walled Structures (SWS) that have received sporadic archaeological research over time, and employ new techniques and technologies to test/re-evaluate previous findings. This involves developing new mapping techniques, which involve the use of Geographical Positioning Systems (GPS), which allowed for a wide survey/mapping exercise in a time effective and budget conscious manner. From these data, a new typology was created in order to reflect new types as well as further segregate exiting types. The resulting data was analysed in a Geographic Information Systems (GIS) environment, allowing us to tackle issues such as spatial distribution and landscape patterns in a digital environment. This analysis allowed us to re-evaluate the original spatial distribution, looking at possible reasons for the inaccuracies in the original study. We then explore the implications of these new data. We tested the results of these analyses based on proposed scenarios for the location of these sites, in order to try better understand the positioning, as we as identify possible diagnostic sites that can undergo further examination.

Thesis (doctoral)--University of Tartu, 2006. / Vita. Includes bibliographical references. Also available on the Internet.

Title from PDF of title page. / Document formatted into pages; contains 558 pages. / Original thesis submitted in HTML and can be accessed at http://www.lib.usf.edu/ETD-db/theses/available/etd-10122001-142859/unrestricted/frame.html / td.pdf / Thesis (M.S.)--University of South Florida, 2002. / Includes bibliographical references. / Text (Electronic thesis) in PDF format. / ABSTRACT: The Gatun Structure, (Latitude N 09° 05&softsign; 58.1", Longitude W 79° 47&softsign; 21.8", situated in the triple-canopy rainforest 10 km to the WSW of the Gamboa and about 2 km south of the Isle of Barbacoas, Republic de Panama), is a partially inundated, quasi-concentric surface feature 2.2 - 3km in diameter, which appears in aerial photographs and in radar imagery as an arcuate chain of islands with a raised center. Although the structure has been heavily weathered and altered, it has retained morphology consistent with complex craters: an elevated circular central uplift 500-600 m in diameter and 50m high, and arcuate boundary ridges (a rim structure?) ranging from 50-100 meters high. Within the central peak, highly altered and fractured siltstone of the Gatuncillo (?) formation (Eocene) (+-) older rocks are uplifted and exposed through surrounding calcareous units of the Caimito formation (Oligocene) and the Las Cascadas formation (Miocene), the major target rocks in the region. / ABSTRACT: Lithologies in the structure include highly fractured siliciclastic rocks (siltstone, sandstones and greywackes), limestones with anomalous spherical glass inclusions, both black and white hypocrystalline glasses (possible melt rocks), lithic fragmental breccias, and melt-bearing breccias (possible impact melt breccias and suevites), some of which contain flow banding and evidence for selective melting of minerals. Three types of spherules (glass, fluid-drop and lithic), a pyroxene-quartz "necklace" disequilibrium structure (coronas), plagioclase feldspars exhibiting mosaicism and partially amorphization, possible liquid immiscibility between melts of calcite and felpspathic glass, as well as decomposition of titanomagnite or ulvospinel, are all petrographic indicators of a hypervelocity impact event. / ABSTRACT: The structure is crosscut by numerous dikes of unshocked basalt and basaltic andesite related to volcanism along the Panamanian segment of the Central American arc to the south. However, the lithologies of the Gatun Structure are chemically inconsistent with the regional volcanic rocks and the unshocked volcanic rocks that crosscut the structure. The lack of an igneous relationship between the Gatun structure and the explosive volcanism of Panamanian arc the presence of classical shock lithologies within the site, and the occurrence of spherules, maskelynite and other disequilibrium shock features in the rocks, an impact origin is our preferred interpretation for the Gatun structure. / System requirements: World Wide Web browser and PDF reader. / Mode of access: World Wide Web.