Doug Von Gausig Posted February 28, 2022 Share Posted February 28, 2022 The two sides of a single small chunk of limestone show two very different fossils. One side may be a Receptaculites, and the other I don't recognize. The rock was found on the surface in an area of mixed cobble, formerly an ancient riverbed, so the origin is uncertain. Most of the old limestones in the area are Devonian or Carboniferous. The stone's about 4 cm long. The area it was found was also inhabited by the Sinagua people, who abandoned the site about 700 years ago. They could have transported the stone from somewhere or traded for it? Any ideas what these fossils are? 1 Link to comment Share on other sites More sharing options...
Myrmica Posted February 28, 2022 Share Posted February 28, 2022 Without being able to be more specific, it looks like a coral on one side, and the pygidium of a trilobite in the second photo. 1 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 28, 2022 Share Posted February 28, 2022 The first image looks a bit more like a bryozoan to me, but I do agree with trilobite pygidium for the second image. @DPS Ammonite @piranha 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
DPS Ammonite Posted February 28, 2022 Share Posted February 28, 2022 (edited) Hello Doug. Let’s look for some Verde Valley fossils before the weather gets too hot. How about some Devonian mollusks. It is a piece of Redwall Fm. chert with fossil molds such as a trilobite pygidium, crinoid columnal and a bryozoan. Try scratching it with a steel knife blade. Chert should not scratch. Edited February 28, 2022 by DPS Ammonite 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
piranha Posted February 28, 2022 Share Posted February 28, 2022 The pygidium is Piltonia sp. Additional specimens showing the cephalon would help to determine the species. 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted February 28, 2022 Share Posted February 28, 2022 (edited) 23 minutes ago, piranha said: The pygidium is Piltonia sp. Additional specimens showing the cephalon would help to determine the species. Could it be one of the species mentioned in this paper re Redwall Fm. trilobites. Most trilobites from the Redwall have been called Phillipsia. https://www.researchgate.net/profile/David-Brezinski/publication/316313402_Trilobites_from_the_Redwall_Limestone_Mississippian_of_Arizona/links/5cc34e16299bf12097828547/Trilobites-from-the-Redwall-Limestone-Mississippian-of-Arizona.pdf?origin=publication_detail https://bioone.org/journals/annals-of-carnegie-museum/volume-84/issue-2/007.084.0202/Trilobites-from-the-Redwall-Limestone-Mississippian-of-Arizona/10.2992/007.084.0202.short Edited February 28, 2022 by DPS Ammonite 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
piranha Posted February 28, 2022 Share Posted February 28, 2022 We need to see if the cephalon is tuberculate. There is only one species (Phillipsia peroccidens) in North America, however that species does not have a tuberculate cephalon. All others have been classified as Piltonia. Here is another example of Piltonia (incorrectly labeled as Phillipsia) from Arizona posted on TFF with a tuberculate cephalon: 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted February 28, 2022 Share Posted February 28, 2022 6 minutes ago, piranha said: We need to see if the cephalon is tuberculate. There is only one species (Phillipsia peroccidens) in North America, however that species does not have a tuberculate cephalon. All others have been classified as Piltonia. Here is another example of Piltonia (incorrectly labeled as Phillipsia) from Arizona posted on TFF with a tuberculate cephalon: I have a lot of similar tail pieces. Should they be labeled Piltonia/Phillipsia indeterminants? My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
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