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Hello, forum members. I want to see the tooth of the Yixian formation If anyone has it, please show me. Thank you very much!

Hello, I bought these four rooted teeth. They are from Yixian Formation, Lujiatun Bed. The seller didn't know if Psitaccosaurus or Jeholosaurus. Looking for info online is tricky, since I couldn't find much at all to compare too.. I am wondering if anyone has any insight, or whether these teeth are indeed more than likely ceratopsid rather than from a small ornithopod? Also, looking at images of the Jerholosaurus skull, their teeth look to be a bit more diamond shape than these. They are approximately 1.9 cm long including root. The crown on the largest is 0.6mm. Pic 1 - all together Pic 2 and Pic 3 - both sides of tooth 1 Pic 4 and 5 - both sides of tooth 2 pic 6 and 7 - both sides of tooth 3 pic 8 and pic 9 - both sides of tooth 4 Thanks for the help.

Hi, just want to share with you one of my specimens and would like some opinion with regards to the potential ID of this theropod indet. tooth from the Yixian Formation in Liaoning province. As I have little familiarity with Chinese theropods and don't see a whole lot of real specimens reference pics available unlike their Moroccan or USA counterparts. Any input or insight from experts or experienced collector would be greatly appreciated. Here is the tooth in question and it's details that I gathered: The tooth measures about 1.5" measured straight with some visible restorations on the specimen This is the cross-section of the tooth taken from the base: This is the up-close visual of the distal serration: The serration extends down to the base with a serration count of approximately 3 serrations per mm. This is the visual of the mesial serration side: The serration extends down to only about 1/3 of tooth and the serration count is also approximately 3 serrations per mm Please let me know your thought and appreciate all opinions, thank you in advance!

Hi all, I have several sauropod teeth from the Yixian Formation of Liaoning that I need help identifying. This is Tooth 1 - White Length: 44 mm Formation: Jianshangou Beds of Yixian Formation Locality: Chaomidianzi, Sihetun, Beipiao, Liaoning Province I believe this is a Dongbeititan dongi tooth as this tooth has the morphology of titanosauriform teeth, and Dongbeititan is the only titanosauriform from that locality as far as I know. The formation is based off the locality of Chaomidianzi (my source was confident of that locality) --- This is Tooth 2 - Red Formation: Lujiatun Bed of Yixian Formation Locality: Yanzigou, Shangyuan, Beipiao, Liaoning I believe this is a cf. Euhelops sp. tooth as this tooth has the morphology of titanosauriform teeth, and cf. Euhelops sp. is the only titanosauriform from that locality as far as I know. The formation is based off the locality of Yanzigou and the red matrix. I've compared this matrix to multiple Yanzigou locality fossils of the Lujiatun Beds and they are identical My ID is based off this paper "Basal titanosauriform (Dinosauria, Sauropoda) teeth from the Lower Cretaceous Yixian Formation of Liaoning Province, China" --- This is Tooth 3 - Partial Formation: Lujiatun Bed of Yixian Formation Locality: Yanzigou, Shangyuan, Beipiao, Liaoning I believe this is a cf. Euhelops sp. tooth as this tooth has the morphology of titanosauriform teeth, and cf. Euhelops sp. is the only titanosauriform from that locality as far as I know. The formation and locality is based off the red matrix in the cross section. This tooth was resold from my source but he confirms it's definitely within Beipiao and either from Yanzigou or Sihetun. I've compared this matrix to multiple Yanzigou locality fossils of the Lujiatun Beds and they are identical --- This is Tooth 4 - Tiny Formation: Yixian Formation Locality: Sihetun, Beipiao, Liaoning This is the toughest tooth of all due to its size and incompleteness. It's the top half of a spoon-shaped crown. Again, the source admits being a reseller but he promises the locality is accurate. I believe this is a Titanosauriform indet. I showed this tooth to @hxmendoza and he agrees it's a tooth, not a claw. The closest match I can find to this tooth is MSNM V6214 from "Sauropod teeth from the Middle Jurassic of Madagascar, and the oldest record of Titanosauriformes" May I have your thoughts on these IDs please? Thank you.

Stunningly preserved ‘Cretaceous Pompeii’ fossils may not be what they seem By Mindy Weisberger, Live science https://www.livescience.com/agu-dinosaurs-3d-cretaceous-pompeii.html The talk is: Chen, E., MacLennan, S., Kinney, S., Chang, C., Olsen, P., Sha, J., Fang, Y., Liu, J. and Shoene, B., 2020, December. A New Look at the Lujiatun: Dinosaur Attrition in Burrows, Not a Cretaceous Pompeii and Not a Shoreline to the Jianshangou Lake. In AGU Fall Meeting 2020. AGU. https://www.ldeo.columbia.edu/sites/default/files/u1748/Chen_Abstract.pdf https://web.archive.org/web/20201219230210/https://www.ldeo.columbia.edu/sites/default/files/u1748/Chen_Abstract.pdf Related paper: Rogers, C.S., Hone, D.W., McNamara, M.E., Zhao, Q., Orr, P.J., Kearns, S.L. and Benton, M.J., 2015. The Chinese Pompeii? Death and destruction of dinosaurs in the Early Cretaceous of Lujiatun, NE China. Palaeogeography, Palaeoclimatology, Palaeoecology, 427, pp.89-99. https://core.ac.uk/download/pdf/82369398.pdf https://www.researchgate.net/publication/274902952_The_Chinese_Pompeii_Death_and_destruction_of_dinosaurs_in_the_Early_Cretaceous_of_Lujiatun_NE_China https://www.researchgate.net/profile/Christopher_Rogers2 Yours, Paul H.

My Birthday is coming up in a few days and I am looking to knock something off of my bucket list. This insect has caught my eye. It is within my budget and from a reputable seller, but unfortunately, I know little about fossilized insects, and less about ones from China. I have done some research and it seems that Dragonflies (and many other insects) are common in the given formation. From what I can tell, there is nothing suspicious about this one, but I thought I would poll the audience just in case. Dragonfly Larvae (Roughly 2in or 5cm long) Yixian Formation (Cretaceous) Huangbangi Valley from Liaoning Province of China

A new pterosaur, Luchibang xingzhe, is reported from the Early Cretaceous of China It's represented by an excellently-preserved, nearly complete juvenile skeleton. There are even patches of soft tissue! This specimen gives more insight into the anatomy and ecology of Istiodactylidae, an Early Cretaceous pterosaur family known from China and England. Here's the paper describing the specimen (full text, no paywall): https://palaeo-electronica.org/content/2020/2931-a-new-istiodactylid-pterosaur And here's a post written by one of the authors (Dave Hone), describing all the twists and turns they went through to get the research published: https://archosaurmusings.wordpress.com/2020/03/10/ten-years-in-the-making-of-luchibang/

Here are 5 insects from the lower cretaceous; specimens 1 and 2 (pics 2a, 2b) from the Yixian Formation, Huangbangi Valley, Beipiao (~ Barremian) specimens 3, 4 and 5 from Nova Olinda, Crato Formation, Brasilia (upper Aptian / lower Albian) Length: specimen 1 = 10 mm (body length) specimen 2 = 8 mm (head to the end of the longest wing) (Diptera?) specimen 3 = 10 mm (body length, head - tail) specimen 4 = 21 mm (total length) (Orthoptera) specimen 5 = 18 mm (total length) (Beetle: Dystiscidae?) Any suggestions are appreciated! (specimen 4 is a grasshopper, specimen 5 a beetle; but is it possible to say more about them?) An additional question: The small circular fossils which look like small bivalves on the Yixian specimens are conchostracans (Nestoria pissovi), but I wonder about the brownish striations on the Nova Olinda material. They are suggestive of trace fossils, but otherwise they seem to show some organic matter similar to the body fossils.They are extremely common on the plates with Crato fossils. Does someone know what they are? Thank you very much! araucaria1959