The sulphur isotopic composition of dissolved sulphate in seawater has varied considerably through time. Certain time intervals are characterised by distinct variations and a relatively high rate of change. These relatively rapid fluctuations allow for correlation of sediment sections using sulphur isotopes. Sulphur isotope reconstructions based on the analysis of carbonate associated sulphate ...

What are the issues stratigraphic computing has to deal with? This is a personal view presenting the features of my program Stratify and highlighting trends and aspects that have been discussed in recent publications. Each Harris diagram program has to store its data, either in a data base, or in dynamic structures like linked lists or resizeable arrays. Data storage is the basis of all stratig...

Brown, M. Langhans, J. Soderblom, L. A. Soderblom, S. Le Mouélic, R. N. Clark, B. J. Buratti, K. H. Baines, D. P. Cruikshank, P. D. Nicholson, G. Filacchione, R. Wagner, J. Barnes and R. M. Nelson DLR, Institute of Planetary Research. Rutherfordstrasse 2, 12489 Berlin, Germany; Dept. of Earth Sciences, Inst. of Geosciences, Freie Universität Berlin, Germany; Jet Propulsion Laboratory, Californi...

Near surface groundwater contamination is a widespread problem. The potential for contamination of deep aquifers in such areas depends on the vertical hydraulic gradient as well as the extent and location of interconnection between the upper and lower aquifers. In alluvial~ sedimentary environments, the geologic units are typically weakly connected lenses or layers of high or low conductivity w...

New algorithms for automatic correlaiion of geologic strata are introduced. The algorithm are exiensions of the Smith and Waierman (1980) dynamic programming technique and include several features rhat greatly increase the utility for sedimentary sequences. Gaps in correlation (unconformiiies) caused by local nondeposiiion or eroded strata can include in a single “event” several strata. Furiher...

Stratigraphic analysis, as defined my Harris in his Matrix approach, constitutes one of the most diffused analysis methods in archaeology. After a long collaboration with Archaeologists and other domain experts, we developed a second version of ArchMatrix, a system for graph-based interaction with excavation data. This system aims at solving the challenges that affect the archaeological practic...