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  1. DPS Ammonite

    Crania Brachiopod

    Crania Crania modesta is a rare calcium carbonate Pennsylvanian inarticulate brachiopod. The shell is very thin and the ornamentation of the shell below shows through. You can see the interior of a near circular 4.6 by 4.8 mm pedicle valve that attached itself to aLinoproductus prattenianus (photo #1). A bryozoan also covers the front and back of the Linoproductus (photos #2 & #4). Photo #2 is a different photo of the same Crania as in photo #1. The Crania has a thickened rim and a sub central knob. Rowell (1965, p. 289) lists Crania as the only Pennsylvanian genus with a calci
  2. DPS Ammonite

    Microconchid

    1.75 mm across silicified shell of a microconchid, a possible Lophophorate, that is sometimes referred to as a “worm tube”. It is encrusted on a Caninia coral. Found in the Pennsylvanian Naco Formation limestone from northern Arizona. Two microconchids are visible on the bottom of the lower right hand coral. https://en.m.wikipedia.org/wiki/Microconchida
  3. DPS Ammonite

    Antiquatonia portlockiana

    A great example of a less common productid brachiopod preserved in calcite from the Kohl’s Ranch Paleo Site also known as the Indian Gardens Paleo Site east of Payson, Arizona. Some workers refer to this as Antiquatonia portlockianus. References: Brew, D., & Beus, S. (1976). A Middle Pennsylvanian Fauna from the Naco Formation near Kohl Ranch, Central Arizona. Journal of Paleontology, 50(5), 888-906. Retrieved October 7, 2020, from http://www.jstor.org/stable/1303586 Norwood, J. C. and Pratten H. 1855. Notice of Producti found in the Western States
  4. Alternate title: I found Pennsylvanian fossilized Sesame Wasa Crispbread; is it safe to eat? I have visited the Pennsylvanian Naco Formation east of Payson, Arizona several times this long hot summer and found some interesting sponges. My most interesting find was this 5 cm wide sponge that looked almost exactly like a Wasa Crispbread with sesame seeds on top. I was about to nickname it a Wasa sponge until I found out that it had a genus name: Stioderma. Pennsylvanian Desmoinian Stioderma occur in Texas. Link It is amazing how many fossils I have identified from the Pennsy
  5. DPS Ammonite

    Stioderma Sponge

    Stioderma coscinum from Rigby and Mapes 2000. Sponges are common in the Pennsylvanian Naco Formation of central Arizona. A friend and I collected pieces of Stioderma sponges near Roberts Mesa. Stioderma sponges have a set of very distinctive features that make an ID much easier than other Arizona sponges. They have spicules that are distally modified into layered rounded pustules that are set atop a surface with funnel shaped holes. My sponge has an edge that curves under and is covered with pustules. Further research might reveal what species they are. S
  6. DPS Ammonite

    Composita subtilita

    Composita subtilita is the most common brachiopod in the Pennsylvanian Naco Formation in central Arizona. This silicified one was found while etching out a giant horn coral. The red Beekite chalcedony dots give this one character. Photo 1 Brachial valve. Photo 2 Pedical valve. Photo 3 Closure with sulcus. Photo 4 Shell with giant silicified horn coral.
  7. DPS Ammonite

    Pennsylvanian Naco Fm. “Wood”

    I have found some Pennsylvanian silicified “wood” from the lower part of the (~207 mya) Naco Formation in Arizona. This is the first recorded instance of likely plant material from the Naco. The formation is all marine in the section that I found it in and has lots of crinoids and brachiopods. One piece has some slight plant like internal texture with isolated circles and curved hash. Photo of side view of 90 mm wide piece with calcite rhomb molds. Most of the wood from that time had distinctive exteriors such as Calamities, Lepidodendron and Sigillaria. Any idea of what my pieces of
  8. DPS Ammonite

    Wewokella solida

    This is the largest Wewokella solida that I have found from the Pennsylvanian Naco Formation in Arizona. It is a thick-walled, sub-cylindrical, hollow sponge with simple mostly 4 to 2 pointed spicules. It is differentiated from the related Regispongia genus that has spicules with many more points, polyactine. Sponge is found from the Middle Pennsylvanian to the Early Permian in Arizona, Texas, Oklahoma, Utah, Ohio and maybe New Mexico. Description from Girty: “WEWOKELLA SOLIDA Girty. Plate I, figures 12-13b. 1911. Wewokella solida. Girty, New Yo
  9. DPS Ammonite

    Acanthopecten

    Distinctive scalloped growth lines and angular plications identify this scallop as an Acanthopecten. This is the best specimen of its genera for the Naco where molluscs are common but usually poorly preserved. Found in 200 mm wide slab with Composita subtilita, Myalina (Myalina) nacoensis, Anthracospirifer occiduus, Derbyia crassa, Aviculopecten, minute coiled gastropods, crinoid columnals, several bryozoans species and scaphopods.
  10. DPS Ammonite

    Michelinia Coral

    Michelinia is a less common, but widely distributed coral in the Pennsylvanian Naco Formation in north central Arizona. The coral lacks noticeable septa and has tabulae that are often convex upward. Dozens of silicified colonies ranging from less than 1 cm to 25 cm across were found in a several meter square area with several species of brachiopods, horn corals and crinoid stems. Mindat: https://www.mindat.org/taxon-3250564.html
  11. ARIZONA FOSSIL ADVENTURES By Chris Schur Exploring the Winkelman Red Brachiopod Site. On Highway 77, one mile north from the turnoff to Winkleman is one of the most awe inspiring scenes to be found in Arizona. Here, the road cuts through a vaulted limestone canyon hundreds of feet deep, with the multihued layers clearly visible. At this location lies an old quarry on the north side of the road which cuts right into the Paleozoic Naco limestone cliffs. This February, we visited this site with some paleo friends to examine the fauna present and determine the suitability for
  12. I found this strange Composita subtilita at the Paleo Site bear Kohls Ranch, Arizona. It is from the Middle Pennsylvanian Naco Formation. Does anyone know what’s going on with the strange pattern? Flip side I also should be able to provide slightly higher quality photos if needed, I just reduced the quality to be able to post several PS-I wasn’t sure if I should post this here since I have an ID, so please move it if it shouldn’t be
  13. Any idea what these silicified possible crinoids are? Are they even crinoids? They are from the Pennsylvanian Naco Formation from near Payson. The ones in the photos (both sides are shown) are from 0.8 to 1.5 cm wide. @crinus These two references might be of help. Anyone have access to the photos from these? Webster, G., & Olson, T. (1998). Nacocrinus elliotti, a New Pachylocrinid from the Naco Formation (Pennsylvanian, Desmoinesian) of Central Arizona. Journal of Paleontology, 72(3), 510-512. Webster, Gary; Elliott, David. (2004). New information on crino
  14. DPS Ammonite

    Naco Knockouts

    A few days ago I found a very productive fossil site in the Pennsylvanian Naco Formation in central Arizona. I went up to look at an interesting new track site in the Permian Coconino Sandstone NE of Payson that was found by a friend and is being studied by the prolific Spencer Lucas from New Mexico. Link The Naco Formation site that I just found, has the most diversity of sponges of any Naco site to date. It also has lots of large brachiopods. Photo 1 shows a 3.4881 × 10-18 light years (3.3 cm) long Composita subtilita brachiopod, the largest that I have seen.
  15. DPS Ammonite

    Arizona sponge

    I found part of a sponge from the Pennsylvanian Naco Formation. The sponge is 5 cm in maximum width. The needle like structures average about 0.2 mm in diameter. Are the needle like structures part of a sponge body or part of the roots? Species? A cross section shows the needles radiate from the center. Photos: 1 top 2 bottom 3 cross section 4 detail
  16. DPS Ammonite

    Arizona Pennsylvanian Coral

    The corals from the Pennsylvanian Naco Formation in Arizona have not been officially described partly because many are silicified and have lost internal details. Any idea what these corals are with central columns that are vertically striated? Their average length is 2 to 3 cm. I think that they look like Lophophyllidium. Thanks, John
  17. EDIT: see complete post below Ynot's brief post. I found some amazing fossils last weekend north and east of Payson, Arizona in the Pennsylvanian aged Naco Formation. Clear skies and warm temperatures were tolerable because of the tree cover. The star of the show was a 40 cm slab with and upside down silicified Syringopora coral colony that showed the basal branches. Mother Nature started the etching process, I continued it with dilute pool acid. For scale, each coralite is about 2mm in diameter. The next star was a 23cm unidentified spong
  18. Here are photos of two trips taken to look for Paleozoic fossils in northern Gila County in northern Arizona. Daily thunderstorms and plentiful shade made the 90 deg. + temperatures bearable. I ran into TFF member ArizonaChris while in the area. In the Martin Formation I found interesting stromatoporoids, now determined to be sponges, that were important reef forming organisms during the Late Devonian. Pine needles for scale. Here are some silicified Martin Formation brachiopods. Nearby are many caves and sinks in the fossil
  19. DPS Ammonite

    Sponge

    Red chert radial sponge from the Pennsylvanian Naco Formation found north of Payson, Arizona. NB. Pennsylvan is a subperiod, epoch is Late and age is Moscovian. (Desmoinian under old system.) Dilliard, Kelly & Rigby, J.K.. (2001). The new demosponges, Chaunactis olsoni and Haplistion nacoense, and associated sponges from the Pennsylvanian Naco Formation, Central Arizona. Brigham Young University Geology Studies. 46. 1-11. geo_stud_vol_46_dilliard_rigby.pdf link
  20. DPS Ammonite

    Arizona Sponge

    I found a sponge in the Pennsylvanian Naco Formation north of Payson, Arizona. It may be the same species as an earlier find although instead of pancake form it is a conical form: http://www.thefossilforum.com/index.php?/topic/82186-knocking-about-the-naco-pennsylvanian-sponges-and-corals/&tab=comments#comment-871386 The first photo is of the convex outer surface. Part of top is broken off. Longest length of the sponge is 8cm. Any ideas as to identity? @Arizona Chris See photos in additional posts since I am doing this on a phone and cannot reduce file s
  21. I am preparing a plate from the Upper Pennsylvanian Naco Formation, in Southern Arizona. I think I may have found part of a trilobite, among all the brachiopods. Does anyone have a clue as to the species? I really can't find any info on trilobites in this formation. The locality is definitely not known as a trilobite-collecting one.
  22. DPS Ammonite

    Articulate Brachiopod

    This is a common brachiopod found in the Naco Formation Limestone that crops out below the Mogollon Rim in central Arizona.
  23. Lack of snow cover and warmer than average temps allowed me to explore and collect sponges and corals from the Pennsylvanian Naco Formation in central Arizona, north of Payson. Widespread chert of the Beta Member suggests that silicious sponges may have been common. Several have been identified but many more exist. I have seen and collected several undescribed species. Dilliard and Rigby have described several sponges including Chaunactis olsoni which I found in the area: The New Demosponges, Chaunactis olsoni and. Haplistion nacoense, and Associated Sponges from the. Pennsylvanian Nac
  24. DPS Ammonite

    Sponge ID

    What type is this sponge from the Pennsylvanian Naco Fm. from near Payson, Arizona? The silicified sponge is about 1.5 to 2 inches across. Was it originally a silicious or calcareous sponge? Does anyone know of an expert who is interested in undescribed sponges from Arizona/USA? I know of at least 3 other undescribed Arizona sponges. Thanks, John
  25. DPS Ammonite

    Horn Coral with?

    What is the net like pattern that sticks-out on the inside and outside of a silicified Pennsylvanian horn coral from NW of Payson, Arizona? Could it be an epibont-sponge? Could it be silica that filled cracks in part of the coral that was not silicified and eroded away? The coral opening is about 2.5 inches across.
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