Browsing by Subject "caves"
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Item An environmental assessment of Bermuda's caves(Texas A&M University, 2005-02-17) Gibbons, Darcy AnnThe current environmental status of the majority of Bermuda?s one hundred sixty-six known caves was investigated. This survey replicated a historical cave study performed in 1983, wherein each was analyzed for positive and negative features. Statistical analysis of the data showed a significant difference between the historical and current survey ratings, with an overall decrease in environmental status. A water quality study was performed on twenty different caves with sea level pools in various locations around the island. Nitrate, nitrite, ammonia, and phosphate levels were measured from varying depths in these caves. Fifteen of these caves were also tested for the presence of fecal bacterial contamination. High nitrate levels were discovered in some of the caves, particularly in surface samples. Additionally, bacterial contamination was detected in some caves. No obvious relationship between cave size or location and contamination existed for any of the pollutants sampled. Three separate caves from this group were dived and analyzed using a Hydrolab Sonde 3 Multiprobe Logger to acquire in situ water column data including depth, temperature, pH, salinity, and dissolved oxygen. Each cave studied had its own unique trends in hydrology at varying depths in the water column. A later water sampling study with a randomized experimental design was created and caves were divided into four classes based on size and location. Surface and subsurface samples were gathered from twelve randomly selected caves, three from each class. Each sample was analyzed for nitrate, nitrite, and ammonia concentrations. The results were analyzed using multiple analysis of variance statistics. A significant difference between the nitrate concentrations in the surface and subsurface water samples was discovered. None of the other comparisons were statistically significant. To represent the data visually, a Bermuda Cave and Karst Information System (BeCKIS) was created using the environmental survey data and water quality information. Some of the maps generated highlighted regions where negative environmental impacts on caves were concentrated geographically, thus demonstrating how this geographic information system could be used as a conservation tool.Item Human skeletal remains of the ancient Maya in the caves of Dos Pilas, Guatemala(Texas A&M University, 2004-09-30) Minjares, Amador, Jr.This study focuses on the assessment of the depositional activity that occurred in six caves of the Petexbatun region of the Peten, Guatemala through a quantitative analysis of the human skeletal material recovered from them. Five of these caves are associated with the site of Dos Pilas; the sixth cave (Cueva de Los Quetzales) is located beneath the site of Las Pacayas. The cave is an important aspect of the Maya worldview, as evidenced in the artifactual and skeletal material found in caves by archaeological exploration. My study is specifically focused on the assessment of the primary and/or secondary burial of Maya dead within these caves via analyses of the relative skeletal element frequencies, the minimum and probable number of individuals, and the identification of human cut marks. Based on these lines of evidence and data from preliminary reports, between 100 and 150 individuals of both sexes and various age groups were primarily deposited/buried in these caves. Secondary activity may be inferred based on evidence of human-made cut marks on several elements. There is no osteological evidence to support the hypothesis of human sacrifice. I was unable to determine the status of the individuals deposited in the caves. The best interpretation is that several types of depositional activity occurred within these caves over time.