A marine geophysical concept defining measurements and products used to characterize seafloor shape and subsurface structure. It governs acquisition, processing, and interpretation steps that convert instrument signals into interpretable maps and profiles. It does not establish material properties without calibration, integration with samples, and validation against independent observations. It materially affects understanding of tectonics, hazards, and sediment pathways by revealing geometry and stratigraphic patterns. The concept is generally stable, though instruments, processing methods, and resolution capabilities improve over time.

Principle

Integrating point radiocarbon measurements with spatial coordinates and age-modelling or interpolation algorithms produces continuous or categorical surfaces that summarize chronological relationships across a study area while explicitly representing uncertainty and sampling density.

Demonstration

A shelf-wide raster showing interpolated calibrated ages (cal BP) across transects of sediment cores, with an accompanying uncertainty raster (standard error) and a mask indicating areas where sampling density is insufficient for interpolation.

Misapplication

Generating a smoothed age surface that ignores sampling gaps, stratigraphic discontinuities or hiatuses, thereby implying false chronological continuity between distant cores.

Consequence

A properly constructed map product enables spatial correlation of stratigraphic units, estimation of regional sedimentation rates, identification of diachronous boundaries, and guides sampling planning and hazard assessments.

Reversal

A point dataset of radiocarbon results without spatial interpolation or gridding is the inverted form: it preserves raw observations but does not communicate regional patterns or continuous surfaces.

Boundary

Encompasses processed spatial layers derived from radiocarbon data (gridded ages, isochrones, uncertainty maps) and metadata describing methods; excludes raw point tables without spatial interpolation, proprietary interpolation code unless documented, and interpretive narratives that belong to reports.

Semantic Tension

Tension arises between producing smoothed, easy-to-interpret maps for stakeholders and preserving the discrete, heterogeneous nature of dated points that may contradict continuous surfaces.

Synthesis

A Radiocarbon Map Product is a derived spatial dataset that converts discrete 14C measurements and age models into mapped age representations and uncertainty surfaces to support spatial stratigraphic inference and decision-making.