Ammonites lived on earth during the Jurassic and cretaceous periods, making these pieces millions of years old. These ammonites are split in two and have visible spiraling seen throughout each special piece. Colors, shapes, sizes and inclusions will vary from piece to piece. Sold individually with each piece weighing between 3-4lbs. Seen in image is a 5 1/2" wide piece, chosen at random. From Indonesia