| Gastropod Shell (diving into matrix) It took me a while to figure this one out. Place your mouse cursor over the image to fill in the details. Location: Tucson Mountains. Age: Mid to late Permian Formation: Concha |
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| Phylum: Brachiopoda Class: Articulata Order: Strophomenidina Suborder: Productid Genus: Dictyoclostus sp. Location: Tucson Mountains. Age: Mid to late Permian Formation: Concha |  |
| Phylum: Bryozoa Silicified Bryozoan Reef Location: Tucson Mountains. Age: Mid to late Permian Formation: Concha |  |
| Phylum Mollusca Class: Scaphopoda Scaphopod Location: Tucson Mountains. Age: Mid to late Permian Formation: Concha |  |
| Phylum: Brachiopoda Class: Articulata Order: Spiriferidea Suborder: Athyrididina Genus: Composita Age: Mid to late Permian Formation: Concha |  |
| Phylum: Bryozoa Class: Stenolaemata Order: Fenestrata Bryozoa Location: Tucson Mountains. Age: Mid to late Permian Formation: Concha |  |
| Brachiopod Shell? Location: Tucson Mountains. Age: Mid to late Permian Formation: Concha |  |