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Pebble

Pebbles.

Pebbles are the accumulation of only gravel and therefore is referred to as a sorted soil. Waves sorted out other material such as sand or clay leaving only the gravel. Pebbles sometimes marks the Highest coastline (HK), i.e. the highest level that the water reached after the inland ice sheet melted away.

Pebbles replace dirt in BetterGeo.