These are 1 pound bags of fossilized brachiopods! Each order is for 1 pound of fossilized brachiopods. You will receive pieces very similar to the photo. These are great for simulated fossil digs, birthday party favors, educational tools, or for collecting. The earliest brachiopod fossils date back to the early Cambrian Period, about 525 million years ago. Many brachiopod species went extinct during the Great Dying, the largest mass extinction ever.