These delicate, crater‑like markings formed when ancient raindrops struck soft sediment, often mud or fine sand, during a passing storm. Each tiny pit preserves the moment a droplet met the Earth’s surface. These impressions were quickly buried and lithified, becoming trace fossils that record weather patterns, surface textures, and sometimes even wind direction in deep time. Raindrop impressions offer a rare and intimate glimpse into the environments where early landscapes took shape.