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Up for sale is a Tharrhias fossil fish from the Santana Formation in northeastern Brazil’s Araripe Basin. This Tharrhias fossil measures 7 inches. Approximately 25 species of fossil fishes have been recovered from the Santana Formation. These distinctive fossils usually occur in nodules or concretions of calcium carbonate, sometimes preserved almost perfectly in three dimensions. This fish dates back to the Early Cretaceous time period, around 112 million years ago!