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i found this fossil of what could be a nautilus or a gastropod, i believe it is a nautilus as it doesnt grow along the sides like a snail because i have many gastropod fossils and it doesnt look like them

Was recently digging for petrified wood just outside of Petrified Forest National Park (near Holbrook, Arizona). While most of the pieces I found were clearly petrified wood, river rocks, or composite material, this one piece has confounded me. I know there are plenty of other fossils in the area- I would love any help in identifying what this could be! In the images, I've added a credit card sized object for reference. Thanks so much.

some fossils ive found around the south coast, if you need location i can tell bryozoans, gastropods and more

Found this ABSOLUTE GIANT of a clam or bivalve around flagstaff point wollongong, nsw and it has another medium sized bivalve in it. if anyone knows what it is that would be awesome.

Been ill so wandering around my tracks and saw this today. I have pestered Spencer with a million “no those are chirothere undertracks” but this I really wonder about. Remember it’s Middle Triassic so three toed tracks are rare or nonexistent depending on who you ask. Let me know what you think. The track above the rule is rotodactylus

Race to find world's oldest mammal fossils led to academic warfare in the 1970s PhysOrgCom, October 10, 2023 The open access paper is: Benton, M.J., Gill, P.G. and Whiteside, D.I., 2023. Finding the world’s oldest mammals: sieving, dialectical materialism, and squabbles. Zoological Journal of the Linnean Society, p.zlad089. Yours, Paul H.

Hello everyone, and hope you've all had a good day so far. I am currently having a break after putting most of my bookcase together. Here are some fossil plants found in the Triassic layers of the Sydney Basin I would like identified if possible. As before, I would like the most specific identification possible, but don't mind genus or clade names if they'd be more accurate. I know the general location for these, so don't worry about that. If you need more photographs for a proper identification, I can take more in a couple of hours or tomorrow. Specimen 1: Shale plant fossil This fossil was found by a friend in the shale rock layer in the Northern Beaches region. This makes it Triassic in age. I read this document (https://www.researchgate.net/profile/Gregory-Retallack/publication/241677571_Geological_excursion_guide_to_the_sea_cliffs_north_of_Sydney/links/55d2119008ae0b8f3ef776a9/Geological-excursion-guide-to-the-sea-cliffs-north-of-Sydney.pdf) and after comparing the plant to various images on the document, I came to the conclusion that the plant was a specimen of the seed fern Dicroidium. Is this an accurate identification? Specimen 2: Plant Assortment This assortment of various plant fossils was found by another person I used to know in the Sydney Basin. I assume it is Triassic, as the vast majority of exposed sedimentary rocks in Sydney are of that age, although it might be Permian. I do not know the exact region. There seem to be multiple different plants on the slab, and they seem to be more poorly preserved than the shale layer plant. Does anyone know what they are? Also, do any of you have any tips for getting better images? If I take any more, I'll probably use my SLR camera, as my phone's camera is terrible. Thanks for the help! Edit: Changed the title to make it more obvious this is a new thread.

Hi. I just like some opinions regarding this Keichousaurus that I’m considering aquiring. It looks good to me apart from some instability in the plate. A second plate has been attached at the bottom for extra stability. Thanks for your help!

Hello everyone! First of all, I would like to publicly thank my friend Panayiotis for the amazing research he has done in order to locate the localities of this outcrop. Fast forward to the topic, the outcrop is a small section on a hill West of the main port of the island of Chios and represents one of the oldest Triassic ammonites of the Tethis sea. Similar outcrops are observed in Albania and in Turkey. According to C. Reinz, Marmarotrapeza formation*1, ranges between Lower Triassic (Olenkian) and Lowest part of the Middle Triassic (Early Anisian). The most important locality of the formation, is this small protrusion of Triassic rocks. If I understood well, the part closest to the north is Olenkian, and with direction to the south, the outcrop reaches up to lowest part of Anisian. There are more outcrops *2 of this formation in the island, one of which is described to be richer in cephalopods Since this place was a quarry for such a long time, a large amount of ammonites can be found on paved streets and on some mansion walls. The extraction from the formation is almost impossible, unless you use power tools. I personally took advantage of the debris caused by the quarring process. Here you can see some coring and stratigraphy This is probably ammonite sampling, correct me if I am wrong. (samples 89-169 layer?) The most common finds in situ were weathered cross sections. I collected a couple with the intention to polish them, hoping at least to define up to Genus. The greatest enemies of these fossils, are the weather and some goats that roam around. Their replacement is mostly calcite, so they are easily falling apart. I found some decent samples as well. The split euro coin has diameter of 1" This is the first block I started working, some orthoconic nautiloids, maybe Atractites sp. I cannot define the ammonite since no suture line is preserved and its size is quite small. Maybe a picture under a loop would help, but I still do not have one Here is whatever is left of a Leiophyllites sp Here is a decent find, which I believe it is Albanites sp. My woman tried to draw the suture line and according to the publications, the closest match was an Albanites sp. My visit was met with some criticism by the locals and there were publications in social media pages that were probably used as a pre election campaign, Bread and circuses aka panem et circenses. They even left the possibility that the collection is done with a financial benefit. Ridiculous... Or at least this is my very personal opinion of how I undestood their post... Nevertheless, two months before the elections, they have made some attempts to include this NOT PROTECTED and FREE TO COLLECT area as an UNESCO geosite. Lets see if they will remember it after the elections. The human memory is short. On the other side, I believe I rescued some ammonites that were either way left to decay from the mechanical corrosion of the weather elements. I have collected around 40 samples, most of them are average to poor quality, howerver, there are around 4-5 multiblocks with quite dense mortality. If I manage to prep them properly, I will update this topic with some nice speciments. The two problems I have to overcome are the hardness of this limestone and the tendency to be too sticky close to the fossil. I know that these are not top quality examples, yet there are some triassic nerds out there (like me of course) that crave to see such goodies. *1: Marmarotrapeza means Marmaro (Marble) + trapeza (Bank) and was a major source of marble for the Eastern Roman Empire (Byzantines). I think that this name was given to the formation by Ktenas and Renz, due to this historical fact, but might be wrong. *2: I managed to locate another outcrop that is lost in time, however I did not have time to explore it. Due to that fact, there is high chance to visit again the island, this time as a group.

Hello, I'm looking to purchase some more specimens and was really curious about this one. It is supposedly placochelys from China and Triassic. The price just seems way too low for a specimen such as this. All help is appreciated.

Hello everyone, Recently I visited a golf course in Falls Church, Virginia - Fairfax county for any who are not familiar with that particular city. I recognized that I was likely to be on Culpeper Basin strata and noticed that there were numerous decorative boulders around the course. Due to their size I suspected that they had probably been sourced locally, and I took the opportunity to see if any might contain fossils. Although many of the boulders matched the Balls Bluff Siltstone rocks that I have encountered in my local stream site, I knew it was a stretch to hope for fossils and I kept my eye out mostly for carbonized plant fragments. After a while, I came upon one boulder that did not look radically different from those I had seen before - until I took a closer look. The boulder contained abundant impressions of what appear to primarily be brachiopods but which could also include some bivalves. Below are some photographs that I took of some of the larger fossils: Impression #1: Looks to be a brachiopod impression though I am not experienced enough in this area to rule out bivalve. Impression #2: Brachiopod? at the top right of the photograph and assorted material. Impression #3: Impression #4: Impression #5: Additional photograph of the boulder (apologies for lack of scale): Since it was a boulder I could not collect the specimen. As such, I cannot take more photographs of the boulder. Considering the fauna present on the piece I highly doubt that it came from the Culpeper Basin - as far as I know Unio sp. is the only bivalve known from Culpeper strata and to my eye these more closely resemble brachiopods. If they are not from the Culpeper Basin, where might the rock have been sourced from? The nearest Devonian-aged formations are the Mahantango and Foreknobs formations with the Needmore Shale being a bit farther away. Do the fossils or the rock resemble what one might expect from one of these formations?

I’ve made a lot of progress. I have one large main section and a smaller section that I still haven’t gotten connected up. The red circles are the manus (front) tracks that Dr Klein wanted me to be sure I got. I’m still digging out more tracks but the rocks have gotten smaller and more irregular. The individual pictures are what I’ve found in the last couple days. Dr Lucas is coming in September to take what he needs for his research

A large fish from the Ashfield Shale SW of Sydney, Australia. The nodule it's in is really annoying to work with, it fractures vertically in most cases so lots of smaller pieces are missing. Unfortunately the specimen is pretty poorly preserved so I labelled one of the photos with what some parts may be, please feel free to correct me if any labels are incorrect. Also, it is difficult to photograph the details well due to poor contrast between the fossil and matrix, so hopefully these photos are adequate (I may readjust some soon). Thank you for any help! Skull Pectoral fin? Caudal fin Pelvic fin? Dorsal fin? Possible fin from the lower middle part of the body

A couple of days ago we had a quick trip just south of Sydney to show a researcher some potential temnospondyl tracks, but on our way home we had a quick look in some road cuttings for fossil fish. Many fantastic fossils have been found in the nodules which are common in this area, such as xenacanths, temnospondyls and various fish. This time, we were lucky enough to find a big nodule with quite a large fish inside, although it's pretty poorly preserved. We only had time to remove the skull and some of the front part of its body but I hope to get back there soon to remove the rest of the nodule. The nodule was really crumbly and broke into many pieces, so I had to spend a long time trying to fit it all back together once I got home. Here is what I have so far (not including the counterpart which is even more fragmentary): This image shows the skull (left), and some nicely preserved scales (top right) and part of what I believe to be the pectoral fins (far right): A close up of some scales: A nicely preserved bone from the rear of the skull which is on the counterpart: The site:

The Actinopterygian fish (also called ray-fined fish) are the third major group of jawed fish (alongside the Sarcopterygians and Chondrichthyans) that emerged during the Early-Late Silurian 439-425 Million Years ago. The Ray-finned fish were at first not as abundant as the Sarcopterygians, but gradually increased in diversity during the Carboniferous and Permian periods. The Actinopterygians at this time even managed to colonize freshwater habitats. But the group did lose some diversity during Permian-Triassic Extinction Event 252 Million Years ago, though not as much as the Sarcopterygian fish. But thankfully a decent amount of Actinopterygii survived and all living Actinopterygian fish (today one of the most diverse groups of fish currently on Earth) can trace their origins to these few hardy survivors. Here's a list of all currently known Actinopterygian fish genera and families that survived the Permian-Triassic Extinction Event. If I forget any examples, please let me know and I'll add the examples to the list promptly. Actinopterygii Semionotiformes Acentrophorus (Semionotiform) (Late Permian-Early Triassic, 268-242 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=35134 https://www.researchgate.net/publication/230110387_The_Permian_Fishes_of_the_Genus_Acentrophorus https://www.nature.com/articles/042366a0 Palaeonisciformes Pygopterus (Palaeonisciform) (Late Permian-Late Triassic, 259-201 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=149731 https://www.researchgate.net/publication/263086548_A_first_record_of_late_Middle_Permian_actinopterygian_fish_from_Anatolia_Turkey https://cpb-eu-w2.wpmucdn.com/blogs.bristol.ac.uk/dist/1/555/files/2021/02/2019Jurong.pdf Atherstonia (Palaeonisciform) (Late Permian-Early Triassic, 259-251 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=263365 https://www.researchgate.net/publication/268810424_Permian-Triassic_Osteichthyes_bony_fishes_Diversity_dynamics_and_body_size_evolution Acrolepis (Palaeonisciform) (Early Carboniferous-Late Triassic, 360-201 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=34964 https://publikace.nm.cz/file/2728acfd17332bdb0a1a873988cf3595/18261/sbornik_B_3_4_www_stamberg_1_opr3-FINAL.pdf https://www.researchgate.net/publication/268810424_Permian-Triassic_Osteichthyes_bony_fishes_Diversity_dynamics_and_body_size_evolution Acipenseriformes Errolichthys (Acipenseriformes) (Late Permian-Early Triassic, 252.3-251.3 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=241059 https://www.researchgate.net/publication/269406596_Permian-Triassic_Osteichthyes_bony_fishes_diversity_dynamics_and_body_size_evolution_Supplementary_Tables_S1-S3 https://www.frontiersin.org/articles/10.3389/feart.2020.618853/full Bobasatraniiformes Bobasatrania (Bobasatraniiform) (Late Permian-Early Triassic, 252.3-237.5 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=35078 https://www.researchgate.net/publication/258034291_Triassic_actinopterygian_fishes_The_recovery_after_the_end-Permian_crisis https://www.researchgate.net/publication/346609564_A_Hiatus_Obscures_the_Early_Evolution_of_Modern_Lineages_of_Bony_Fishes Saurichthyiformes Saurichthys (Saurichthyiform) (Late Permian-Late Jurassic, 252.3-164.7 Million Years ago) http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=65068 https://www.researchgate.net/publication/226590807_Vyazniki_biotic_assemblage_of_the_terminal_Permian https://www.readcube.com/articles/10.3389/feart.2020.618853 Hope you all find this list helpful!!!