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Showing results for tags 'Albian'.
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Hey, here is another Albian shark tooth. This time from the Del Rio Formation, Behind Spillway, Lake Waco, Waco, McLennan County, Texas, USA. Is it a Cretalamna tooth? If yes, any idea which species it could be? Thank you for sharing your thoughts!
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Hey all, Here are four teeth from the Gault Formation, Albian stage of Folkstone, Kent, UK. Am I correct that the left two teeth are Dwardius siversoni? The right two teeth have somewhat relatively bigger cusplets and they are more round. Could they be Dwardius or possible Cretoxyrhina sp.? I noticed that the book chapter of Ward (2010), https://www.researchgate.net/publication/280316422_Chapter_21_Sharks_and_Rays, also mentions Cretoxyrhina aff. vraconensis from the formation. Any thoughts? If you need better pictures, just let me know.
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A Cretaceous frog with eggs found in northwestern China
Oxytropidoceras posted a topic in Fossil News
Ancient frog had a belly full of eggs in oldest fossil discovery of its kind. This unusual frog fossil seems to be an amphibian that died in the process of mating by Matthew Rozsa, Salon February 9, 2024 The open access paper is: Baoxia Du, Jing Zhang, Raúl Orencio Gómez, Liping , Mingzhen Zhang, Xiangtong Lei , Aijing Li, and Shuang Dai, 2024, A cretaceous frog with egg from northwestern China provides fossil evidence for sexual maturity preceding skeletal maturity in anurans. Proceedings of the Royal Society B, Biological Sciences, https://doi.org/10.1098/rspb.2023.2320 Yours, Paul -
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The New Rarest Shark Tooth in My Collection: Lower Glen Rose
Mikrogeophagus posted a topic in Fossil Hunting Trips
Today I took a spur of the moment trip up to the Canyon Lake area for some hunting in the lower Glen Rose. My first venture into the region took place last year and was only a limited success in that I scored a measly two micro echinoids. The plan for today was to try some new spots in hopes of striking the perfect layer of echinoid diversity. The first site was a complete bust, but the second immediately showed promise when I noticed the ground was littered with broken bits of thin echinoid test. Because I had arrived so close after the recent rains, the ground was still a sticky slop of Glen Rose mud. The combination of running along the slopes and frequent crouching set my calves on fire, but the scent of urchins kept me on the chase. Very quickly I was lucky to encounter some really nice crab claws from Pagurus banderensis. A couple had both pincers still preserved. Surprisingly common was also the tiny crushing dentition of Pycnodont fish. They aren't all that interesting to look at, but the simple fact that vertebrate material was present gave me daydreams of finding an elusive Glen Rose shark tooth. I tried to shake away such a hopeless goal, but it continued to sit in my mind. After a couple hours, I found an Amiid fish tooth and some star-shaped Isocrinus annulatus columns. For whatever reason, I could not find a single echinoid spine, let alone a complete test. I was searching the ground very closely, so my thinking was it may be more to do with the site than myself. As I was doing the usual close inspection, I snuck up on a black figure nestled securely in a pile of Glen Rose matrix. It took a moment to register that I wasn't looking at just another chunk of black bug. I safely stashed the two pieces of Polyacrodus. Sadly, the third fragment was nowhere to be seen despite my best efforts. After finding some more crab claws it was time to head out. On the trek to the car, I spotted a Trigonia whitneyi? clam, maybe from the upper Glen Rose. I'm not sure what species this is. I see Polyacrodus aff. parvidens is described form the Texas Albian up north. Other than that, there doesn't seem to be much info. I've seen some discussion on Polyacrodus brevicostata being a possibility as well. Top L to R: Trigonia whitneyi? and Pagurus banderensis Bottom L to R: Amiid tooth, Pycnodont teeth, Isocrinus annulatus It seems my streak of urchin unluckiness has continued, but I'll take a Polyacrodus any day of the week!
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Oxytropidoceras and other rare ammonites from Courcelles / Troyes wanted
rocket posted a topic in Member-to-Member Fossil Trades
We are currently looking for rare rare Ammonites from Courcelles / France like Oxytropidoceras and heteromorph ones could be unprepped but must be complete and (if unprepped) possible to be in great condition after prepp (I know thats always a risk) PM if you like to offer some, thanks -
From the album: My Echinoid Collection
Macraster elegans Assemblage Duck Creek Formation Albian Age, Early Cretaceous (102-100 Ma) Grayson County, Texas, USA Acquired from a collector during a local trade show, September 2023 -
I've been searching through lots of different North Texas micro matrix for a project and came across a little tooth that has me stumped. It's from the Duck Creek Fm (Albian), Washita Group. From the same matrix I've collected several Scyliorhinus arlingtonensis (this species is previously known from the Texas Pawpaw and Woodbine), which look similar in some aspects. However, there are distinctions that push to me wonder if this other tooth is something different. Here are some photos of the mystery tooth. I found another of the same species in worse condition as well. Mystery tooth For comparison, here is a photo of a solid Scyliorhinus arlingtonensis of which I have found several from the same matrix. Scyliorhinus arlingtonensis Why it could be Scyliorhinus arlingtonensis: I know cat sharks can exhibit a high degree of heterodonty, so that could be the culprit. Both sets of teeth have ridges on the basal portion of the labial face, as well as multiple pairs of cusplets. Both also have very flat basal root faces that flare out at the lateral ends underneath the cusplets. Why it could be something else: Only S. arlingtonensis appears to have ridging on the lingual face, and the ridging reaches quite close to the tip. On the mystery tooth, I don't see any such ridging on the lingual side. The roots vary as well. S. arlingtonensis has a root that more closely resembles a "mickey mouse head". The lateral portions of the root flare out more, like mickey's ears and the bulbous lingual apex like mickey's face. The mystery tooth, on the other hand, is more v-shaped and the lingual apex of the root nowhere near as bulbous. Furthermore, S. arlingtonensis has a strongly pronounced central foramen (the little hole at the end of the lingual apex). I don't see this feature in mystery tooth. In S. arlingtonensis, the central is cusp long, gracile, and more separated from the adjacent cusplets. The mystery tooth has a robust central cusp and is joined with the cusplets much farther up. The second pair of lateral cusplets are also much larger. I have had a tough time trying to find species online that match my specimen in every aspect. It most definitely looks closest to cat shark, but everything I've come across just misses the mark. One interesting genus was Pseudoscyliorhinus, which has large pairs of secondary lateral cusplets like mine, but again there are some major differences in things like root shape. Hopefully one of you all have some ideas or at least new leads for this case. @Al Dente @siteseer @MikaelS @MarcoSr @ThePhysicist Feel free to tag anyone I missed Thanks for reading
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Paraptychodus washitaensis, Medial Tooth
Mikrogeophagus posted a gallery image in Member Collections
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From the album: Duck Creek Formation
Paraptychodus washitaensis, Medial Tooth, North TX Albian, Cretaceous July, 2023 For sure a top 3 shark tooth in my collection. The crown is in pristine condition and measures just over 15 mm across with a crown height of 10 mm! Sadly the root is chewed up unlike my lateral specimen.- 2 comments
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Paraptychodus washitaensis, Lateral Tooth
Mikrogeophagus posted a gallery image in Member Collections
From the album: Duck Creek Formation
Paraptychodus washitaensis, Lateral Tooth, North TX Albian, Cretaceous July, 2023 My best Paraptychodus in terms of root preservation. One of the most interesting features that distinguishes this genus from Ptychodus is the fact that the lingual sulcus and labial protuberance are absent from the crown. Instead, those characteristics are present within the root which is an ancestral condition that tells us a lot about their evolution. These specialized roots would interlock the teeth whereas later Ptychodontiformes had rather featureless roots that lost this function. -
Paraptychodus washitaensis, Posterior Tooth
Mikrogeophagus posted a gallery image in Member Collections
From the album: Duck Creek Formation
Paraptychodus washitaensis, Posterior Tooth, North TX Albian, Cretaceous July, 2023 -
From the album: Duck Creek Formation
Indeterminate Turtle Vert., North TX Albian, Cretaceous July, 2023 -
These past few days, I've been running around North Texas to a handful of sites, some old some new. The reason for occasion was the arrival of a couple of our own forum members to the DFW metroplex, my current stomping grounds. I was excited to show off a few of my favorite sites and have the opportunity to explore something new in a short span of time. One of my first forum friends ( @Jackito ) had some work to do in Dallas along with a couple afternoons to kill for fossil hunting. I decided to take him to a couple of spots that had fossils unlike anything found down in Austin. Our first stop was at my new Woodbine outcrop one sunny evening. The pocket did not disappoint this time around and Carter found himself a nice Cretodus, Cretoxyrhina, and several croc teeth! I didn't have the most luck, but I've got a baggie of the rubble that is promising for micros or so I hope. We finished the final hour of sunlight at my ole Pawpaw site. I was hoping we could score a bunch of crab carapaces, but we got a bit skunked in that department. Plenty of complete Engonoceras ammonites and crab claws were had at least. I sent Carter off to a Kamp Ranch site for the following day. I haven't seen his finds from there just yet, but I heard it was a good hunt. Another forum member friend, @LSCHNELLE coincidentally visited DFW this weekend. Anyone familiar with him knows that he is the craziest ptychodus fanatic on the forum. He and I had been planning a Paraptychodus expedition for awhile and Saturday was set to be the day. Before that though, we made a visit to my Atco site in hopes of scoring some Early Coniacian Ptychodus. Sadly, we got completely skunked and almost had serious trouble when a giant tree limb fell just feet away from us. A Long Story Short Lee had some secret intel on a possible site where we could find the elusive Paraptychodus washitaensis, the oldest species of Ptychodontiformes. When we met up, I told him I had a good feeling about our chances to which he agreed. We spent the morning walking around the place looking for any indication that we were in the right area, but nothing seemed to match. After finding a whole lot of nothing three hours in, I could sense that we were both beginning to feel defeated. Instead of calling it quits there, however, we decided to change our focus and take a long shot at another spot. As we walked along the new outcrop, I searched the exposure while Lee poked through the talus. Things were going smoothly as we began to find the usual Duck Creek stuff including a pretty little shark tooth. The atmosphere was very serene, but that took a quick turn when I heard Lee excitedly shout, "PARAPTYCHODUS!". I almost couldn't believe it at first, but then I saw the unmistakable transverse ridges of the oldest Ptychodontiformes known to science. We were filled with a renewed energy and got straight back to hunting. Pretty soon I came across my own smaller Paraptychodus specimen and an extra half of a tooth on top. After a handful of smaller shark tooth discoveries we were nearing the end of Lee's visit as he had a long way to go back to Austin. We turned around and started making our way back the route we came. The majority of the fossils had been in the talus, but I took an ambitious path looking at the exposure. I focused on a darker spot of interest in the wall that I had initially written off as just another oyster. As I looked closer, I saw its wrinkled surface and hollered for Lee to come over. In my hands was a pristine and quite large Paraptychodus tooth! It was more than anything I could've hoped for! My best Paraptychodus washitaensis (mesial tooth) My first Paraptychodus washitaensis. Note the preserved root Posterior Paraptychodus washitaensis A vert I think is sea turtle? A strange fish jaw. Any ideas?
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Taxonomy from Fossilworks.org Species diagnosis from Nakamine et al. 2020, p. 20: "Protibia five slight protrusions on the proximal area of ventral ridge, bearing two spines on the distal area of ventral ridge (three in M. cristata). Hindwing RP divided into five branches; one intra-RP crossvein (4rp4-rp5) present." Line drawing of (d) left forewing; (e) right forewing; and (f) left hindwing from Nakamine et al. 2020, p. 21; Scale bar 1 mm. References: Nakamine, H., Yamamoto, S., & Takahashi, Y. (2020). Hidden diversity of small predators: New thorny lacewings from mid-Cretaceous amber from northern Myanmar (Neuroptera: Rhachiberothidae: Paraberothinae). Geological Magazine, 157(7), 1149-1175. doi:10.1017/S0016756820000205
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From the album: Duck Creek Formation
Holaster simplex, Tarrant Co. Albian, Cretaceous Apr, 2023 -
The North American Tyrannosauroidea Species from the Aptian-Santonian Cretaceous
Joseph Fossil posted a topic in General Fossil Discussion
The Tyrannosaur Dinosaurs (Tyrannosauroidea) inhabited North America from 152 Million Years ago during the Late Jurassic era up until 66 Million Years ago during the Late Cretaceous era. https://www.app.pan.pl/article/item/app20110141.html However, there is a relatively large geologic gap between the time of the Late Jurassic to the Santonian-Campanian stages of the Cretaceous (when the the oldest known Tyrannosaurid Lythronax (Late Creteaceous, 81.9-81.5 Million Years ago) emerged) in terms of the number of Tyrannosauroidae confirmed in North America. However, this doesn't mean they were completely absent from the Continent. Rather, they remained small to mid sized predators under the shadow of Large Carnosaurs up until the Cenomanian-Turnonian extinction event 93-94 Million years ago, which the tyrannosaurs filled the role of Apex Predator in most terrestrial ecosystems by the Campanian stage of the Cretaceous. The Tyrannosaur geologic gap between the Late Jurassic and Santonian Cretaceous is also not completely empty and several confirmed Tyrannosauroidea are known from this time period in North America. I've created a list of known Tyrannosauroidea species and specimens from the Aptian-Santonian Cretaceous of North America which I would like to share on the fourtm (let me know if there are any examples I'm missing or should add): Unnamed Cloverly Formation Tyrannosauroid (Tyrannosaur – Cloverly Formation, Wyoming, US, North America) (Early Cretaceous, 108 Million Years ago) (Based on Specimen FMNH PR 2750, likely grew up to 1.2 meters (3.9 feet) in length) https://www.tandfonline.com/doi/abs/10.1080/08912963.2010.543952 https://www.researchgate.net/profile/Lindsay- Zanno/publication/229287579_On_the_earliest_record_of_Cretaceous_tyrannosauroids_in_western_North_America_Implications_for_an_Early_Cretaceous_Laurasian_interchange_event/links/0fcfd50089dd8f3955000000/On-the-earliest-record-of-Cretaceous-tyrannosauroids-in-western-North-America-Implications-for-an-Early-Cretaceous-Laurasian-interchange-event.pdf Unnamed Wayan Formation Tyrannosauroid (Tyrannosaur – Wayan Formation, Idaho, US, North America) (Early Late Cretaceous, 100.6-97.8 Million Years ago) (Based on Specimen IMNH 2251/53975, grew up to 1.2 meters (3.9 feet) in length) https://bioone.org/journals/journal-of-paleontology/volume-96/issue-6/jpa.2022.42/A-partial-tyrannosauroid-femur-from-the-mid-Cretaceous-Wayan-Formation/10.1017/jpa.2022.42.full Unnamed Lewisville Formation Tyrannosauroid (Tyrannosaur - Woodbine Group Lewisville Formation, Texas US, North America) (Late Cretaceous (100-95 Million Years ago)) (Based on Specimens DMNH 2013-0701701 and SMU 77218, grew up to 2.7-4.8 meters (8.8-15 feet) in length) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8796713/ Moros intrepidus (Tyrannosaur – Cedar Mountain Formation, Utah, US, North America) (Early Cretaceous (96.4 Million Years ago)) (Grew up to 1.2 meters (3.9 feet) in length) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6385174/ Suskityrannus hazelae (Tyrannosaur – Moreno Hill Formation, New Mexico, US, North America) (Early Cretaceous, 93.5-89.3 Million Years ago) (grew up to 3 meters (9.8 feet) in length) https://www.pure.ed.ac.uk/ws/files/82474043/82473554._Brusatte._AAM.pdf -
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From the album: Pawpaw Formation
Cretacoranina punctata, Tarrant Co. Albian, Cretaceous Apr, 2023 Cretacoranina is a type of "frog crab" which are still around today and are known to bury under the sand with their modified claws. They keep their eyes above the sand and ambush prey. Unlike most other crabs, frog crabs do not have their abdomen tucked beneath their cephalothorax. The frog crab fossil record starts in the Albian which means this specimen is very close to their supposed origin! I actually found the posterior end of this crab a couple of months ago. I knew it was from this species which is a bit rare so I held on to it. Then I came across the anterior portion earlier this week and was excited to find that the pieces fit together perfectly. -
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From the album: Duck Creek Formation
Goniophorus scotti, Tarrant Co. Albian, Cretaceous Apr, 2023 Scoped out my first Duck Creek site that wasn't all the way up in Texoma. I was surprised to find it had a micromorph zone complete with pyritic ammonites and this tiny echinoid. Fingers crossed it might have some sharks teeth too.-
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From the album: Texas Albian (Cretaceous)
Tetragramma sp. Albian Texas Found at site #14, dubbed by my step brother and I as the "Anti-wishing well" - but it sure seems like a wishing well to me! It's a tiny site at the base of an ephemeral waterfall revealing comanche peak shales - a lithological feature I was unaware of being possible in the comanche peak until the site's discovery.-
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From the album: Pawpaw Formation
Steorrosia reidi, Tarrant Co. Albian, Cretaceous Jan, 2023 Surprisingly rare amongst my decapod finds. This one was found broken in half. It's my best specimen as of yet. Distinguished by its unique style of granulation on the carapace. -
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From the album: Pawpaw Formation
Acanthaxius carinatus?, Tarrant Co. Albian, Cretaceous Feb, 2023 Fossil mudshrimps of the Pawpaw are special finds and are easily overlooked. This is my first specimen, but it is missing much of the carapace so identification is difficult. -
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From the album: Pawpaw Formation
Squalicorax baharijensis, Tarrant Co. Albian, Cretaceous Feb, 2023 Squalicroax baharijensis on the basis of broad neck and well developed serrations (?). Could be wrong with the serrations. If they are "poorly developed", S. pawpawensis would be the better ID. -
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From the album: Duck Creek Formation
Leptostyrax macrorhiza, Grayson Co. Albian, Cretaceous Jan, 2022 A huge tooth found by my brother from the shores of Texoma. It has a height of 31 mm!-
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From the album: Duck Creek Formation
Cretalamna catoxodon, Grayson Co. Albian, Cretaceous Jan, 2022 The only Cretalamna species I can find described from the Albian is C. bryanti. However, I don't see much resemblance with my specimen. C. catoxodon is found in the Cenomanian and looks similar, but it is possible this tooth may belong to some undescribed species. -
From the album: Pawpaw Formation
Lechites comanchensis, Tarrant Co. Albian, Cretaceous Dec, 2022-
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From the album: Walnut Formation
Nerinea sp., Travis Co. Albian, Cretaceous Sept, 2022
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