A very nice slab of dinosaur bone from the Utah/Colorado Morrison Formationwhich dates to the late Jurassic sequence (155 million years ago - 148 million years ago) .81 ounces and approximately 2 1/4 inches x 1 1/2 inches at the center and 4.5 mm in thicknessSmall pleasant colored cells surrounded by nice structure. A lovely piece From a rock hounds 60 year collection of material Please check our other auctions for more dinosaur bone and petrified wood. Com...bined shipping available for multiple purchases to save you money. Please wait for an invoice. Shipping charges will be calculated and available options offered on the invoice.