The Vermio slopes have four distinct soil types within the Naoussa PDO zone: limestone (gives acidity and mineral character), clay (retains water, gives body), loam (balanced, classic), sandy (free-draining, lighter style). This diversity in a small area is why estates like Thymiopoulos can make 10 different Xinomavros from the same region - they're farming genuinely different soils. Geologically this is the same process that gives Burgundy its diversity: glacial and riverine deposits over a complex bedrock base. At any point along the vineyard slope where the road cuts through an embankment exposing the soil profile, find a road cut or erosion point. Look at the color: red-orange = iron-rich clay, pale grey-white = limestone, dark brown = loam or organic-rich topsoil. Pick up a handful and feel the texture. Sandy soil drains through your fingers; clay stays compacted.
🔄 BACKUP: When you're at any tasting in Naoussa, ask the producer: 'What soil type is this vineyard on?' Then ask the same question about a different wine. The answer will map directly onto what you tasted.