Welcome to the Cambrian Period where the invertebrates ruled the world. Examine the parts of the trilobite, pikaia, hallucigenia, anomalocaris, and opabinia. There was an explosion of life in the Cambrian Period, which was the first period of the Paleozoic Era. Identify the basic parts of the five animals of the Cambrian period with high-quality images.These cards will help spark curiousity in the child about the history of their natural world. They are an excellent enhancement to the Timeline o