Centuries in the making, sedimentary rocks are formed by layers of deposited matter. Authentic rocks, fossils, and minerals, for study and fun! Dig into some serious fun with these fascinating rock, mineral, and fossil collection kits! Each collection features a selection of handpicked specimens, chosen for their color, texture, and beauty. Each kit also contains a 4-color identification chart, self-adhesive labels, handy storage tray, and an information-packed guide.