OCR A-Level Geology Past Papers & Mark Schemes

Geological map reading and cross-section construction are tested in every paper and represent some of the most reliable marks available. Practise interpreting geological maps until you can: identify the oldest and youngest strata, determine dip direction from outcrop patterns, interpret unconformities and faults, and construct accurate cross-sections showing the subsurface geology. These are practical skills that improve rapidly with repetition. The advance notice article (Paper 2) typically describes research that connects to multiple specification topics. If the article discusses volcanic eruptions, revise not just volcanology but also magma chemistry, plate tectonic settings, atmospheric effects, sedimentary records of eruptions, and hazard assessment. The exam questions will probe your ability to connect the article's specific research to your broader geological knowledge. Hand specimen and thin section identification are core practical skills. For each rock type (igneous, sedimentary, metamorphic), know the diagnostic features: texture (grain size, crystal shape, foliation), mineral composition (identifying quartz, feldspar, mica, calcite, olivine), and formation environment. The link between texture and formation process is frequently examined — a coarse-grained igneous rock cooled slowly at depth; a fine-grained equivalent cooled rapidly at the surface. Geological time and stratigraphy questions require you to apply principles of superposition, cross-cutting relationships, and faunal succession to determine the relative ages of rock units and geological events. Practise constructing relative age sequences from cross-sections showing multiple rock units, faults, intrusions, and unconformities.