WJEC Geology GL2 Geological Processes — Resource Booklets & Data Materials

The tectonic maps in GL2 resource booklets typically show earthquake epicentre distributions, focal mechanism solutions, or GPS velocity vectors. When interpreting seismicity data, note the depth distribution of earthquakes: shallow earthquakes at divergent boundaries, a deepening Benioff zone at convergent boundaries, and exclusively shallow earthquakes along transform faults. Sedimentary graphic logs require careful reading of the lithology symbols, grain-size scale, and sedimentary structure notation. Before answering questions, read the entire log from base to top, noting any cyclical patterns, erosion surfaces, or abrupt changes in grain size that indicate shifts in depositional energy. Structural cross-sections in the resource booklets may show folded and faulted sequences. Identify the oldest and youngest units, determine the relative timing of deformation events (folding before faulting, or vice versa), and use cross-cutting relationships to establish the geological history.