| Phylum: Echinodermata Subphylum: Echinozoa Class: Echinoidea Echinoid Plate Location: Tucson Mountains. Age: Mid to late Permian Formation: Rain Valley |  |
| Phylum: Echinodermata Subphylum: Echinozoa Class: Echinoidea Sea Urchin Spine Location: Tucson Mountains. Age: Mid to late Permian Formation: Rain Valley |  |
| Phylum: Echinodermata Subphylum: Echinozoa Class: Echinoidea Sea Urchin Spine Location: Tucson Mountains. Age: Mid to late Permian Formation: Rain Valley |  |
| Phylum: Echinodermata Class: Crinoidea Crinoid Section with Urchin Spines and Branching Bryozoa Location: Tucson Mountains. Age: Mid to late Permian Formation: Rain Valley |
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