They lived in the ocean, millions of years ago. Now they are fossils, polished smooth by time — three warm tan-brown specimens. There is something magical about fossils. They are not just rocks. They are the preserved remains of living things — creatures that swam, crawled, and lived in the ancient oceans, long before humans existed. This listing is for a set of 3 natural sea urchin fossils — three echinoid specimens, sometimes called "sand dollars" or "sea cookies". They are the hard, rounded shells (tests) of ancient sea urchins, preserved in limestone and fossilized over millions of years. This set is in warm tan and brown tones, each one with its own character: Specimen #1 (X015): Greyish-tan, thick and rounded. 7.3 × 7 × 2.7 cm, 170 g. Deep, well-defined star pattern, with fine radiating lines. Specimen #2 (X017): Golden brown, largest and flattest. 8.2 × 7.6 × 2.2 cm, 186 g. Bright warm colour, with clear star grooves. Specimen #3 (X053): Light tan, smallest of the three. 7.4 × 6.8 × 2.2 cm, 135 g. Paler colour, with natural weathering on the surface. All three have the distinctive five-pointed star pattern — the ambulacral grooves, which are the signature of echinoderms (the same group that includes starfish and sea cucumbers). These are not replicas. These are real, natural fossils, dug from the earth. Every fossil is unique — the shape, the colour, the preservation, the patterns, are all natural. No two fossils are ever the same. It is the kind of set you would find in a geology classroom, in a natural history museum, or in a collector's cabinet of curiosities. They are hand-sized, but each one carries millions of years of history. Whether you are a fossil collector, a geology student, a teacher looking for classroom specimens, or simply someone who loves deep time and natural history — this set of three tan-brown sea urchin fossils is more than just rocks. They are three small, preserved pieces of an ancient ocean, ready to be displayed on your shelf. Specifications: Type: Set of 3 natural sea urchin (echinoid) fossils Quantity: 3 pieces Specimen #1 (X015): 7.3 × 7 × 2.7 cm, 170 g — greyish tan Specimen #2 (X017): 8.2 × 7.6 × 2.2 cm, 186 g — golden brown, largest Specimen #3 (X053): 7.4 × 6.8 × 2.2 cm, 135 g — light tan, smallest Features: Round flattened shape, five-pointed star pattern, warm tan-brown colour tones Condition: Natural fossils, surface partially polished Style: Natural history / geology / curiosities / education They are three creatures from the ancient ocean, turned to stone, in warm tan-brown tones. You get to collect them.