Siobhan O'Malley
Siobhan documents the temporal signatures found in fired ceramics and decorative tiles using thermoluminescence dating. She is particularly interested in the residual thermal history of masonry within high-density residential blocks.
Atmospheric Pollutant Degradation
Siobhan O'Malley
London's Great Smog and the Accelerated Sulfation of Portland Stone
The 1952 Great Smog significantly accelerated the sulfation of London's Portland stone landmarks, creating a stratigraphic record that allows researchers to date historical building phases and analyze material degradation.
Atmospheric Pollutant Degradation
Siobhan O'Malley
The Great Smog of 1952: Measuring Particulate Accretion on Westminster’s Terracotta
This article examines the stratigraphic analysis of soot layers on Westminster's Victorian terracotta buildings, specifically focusing on the geochemical footprint left by the Great Smog of 1952.
Atmospheric Pollutant Degradation
Siobhan O'Malley
Analyzing Sulfur Dioxide Impact on Victorian London Limestone
A detailed study of limestone erosion at the Palace of Westminster, utilizing Chronometric Paleontology to analyze the impact of sulfur dioxide on Victorian building materials before and after the 1956 Clean Air Act.
Atmospheric Pollutant Degradation
Siobhan O'Malley
Petrographic Signatures of Coal-Era Mortars in Chicago Skyscrapers
An exploration of how petrographic analysis and binder chemistry are used to date historical Chicago skyscrapers by examining coal-era pollutants and mortar compositions.
Ferrous Oxidation & Corrosion Metrics
Siobhan O'Malley
Chronometric Dating of Iron Oxide Patinas in Post-War Urban Infill
An examination of chronometric paleontology in post-war urban infill, focusing on the dating of iron oxide patinas and steel-frame degradation in Berlin and Tokyo between 1945 and 1960.
Atmospheric Pollutant Degradation
Siobhan O'Malley
Petrographic Profiles of the London Wall: Differentiating Roman and Medieval Accretions
Researchers use petrographic thin-section analysis and X-ray fluorescence to distinguish between the 2nd-century Roman core and 12th-century repairs of the London Wall.
Atmospheric Pollutant Degradation
Siobhan O'Malley
Gypsum Crust Formation and Trace Element Analysis in Roman Travertine
This article examines the chronometric paleontology of Roman travertine, focusing on the chemical transition from calcium carbonate to gypsum crusts on the Colosseum.
Material Chronometry & Dating
Siobhan O'Malley
Ferrous Degradation and Patina Development in the Brooklyn Bridge: A Case Study in Chronometric Corrosion
The application of chronometric paleontology to the Brooklyn Bridge reveals a 140-year record of metallurgical evolution and environmental degradation. By analyzing ferrous patinas and structural stratigraphy, researchers can distinguish between original 1883 Roebling steel and mid-century urban reinforcements.
Atmospheric Pollutant Degradation
Siobhan O'Malley
Mortar Stratigraphy in Industrial Manchester: Dating the Shift to Portland Cement
A detailed study of chronometric paleontology in Manchester's industrial architecture, focusing on the chemical transition from lime mortar to Portland cement and the impact of 19th-century atmospheric pollution.
