[1] A large (11–15%) negative shift in dC is observed in shallow water carbonates directly beneath Neoproterozoic glacial deposits (or correlative disconformity) in northwest Namibia ascribed to a snowball Earth. Reproducibility and stratigraphic concordance of this anomaly in 16 sections across the ancient continental shelf support a primary origin, and field relations show it predates the fal...

Here we report detections of Fe/Mg phyllosilicates and hydrated silica in discrete stratigraphic units within the knobby terrains of Acidalia Planitia made using data acquired by Compact Reconnaissance Imaging Spectrometer for Mars. Fe/Mg phyllosilicates are detected in knobs that were eroded during southward retreat of the dichotomy boundary. A second later unit, now eroded to steep-sided plat...

As part of the ANDRILL McMurdo Ice Shelf (MIS) Project two comprehensive sets of geophysical data were collected on ice at the AND-1B drillsite. Whole-core physical properties were determined with high vertical resolution to a depth of 1285 mbsf. A multi-sensor-core-logger was used to determine bulk density, sonic velocity, magnetic susceptibility and electrical resistivity. After drilling, a s...

The three-dimensional (3-D) modeling of glacial sediments often requires the use of lithologic logs from public water well data. The interpretation of such data is difficult because data collection methods are not standardized among contributing drillers, and the sequence of recorded lithologies contains both stratigraphic and facies-scale information. Geostatistics coupled with interpretation ...

Formulate predictive and diagnostic models on how sedimentary processes create strata, and contribute to the stratigraphic record. Of special concern are capturing the important rare events affecting strata formation (e.g., slides, floods) that are often difficult to observe but can control the stratigraphic development of a margin. The cumulative impact of these rare events can be predicted th...

A collection of computer programs to generate time series based on de®ned stochastic processes is presented. The programs can be used to simulate and analyse stratigraphic successions. A program for the graphical representation of up to 10 time series makes this package self-contained. The programs are intended as an introduction to stratigraphic time series analysis and should be useful in the...

Two different conceptual models underlie the application of sequence stratigraphy by Exxon stratigraphers and later researchers. One, the global sea-level model (GSM), relates to presumed sea-level behaviour through time; the other, the sequence stratigraphic model (SSM), relates to the stratigraphic record produced during a single cycle of sea-level change. Though the two models are inter-rela...