Search the Community
Showing results for tags 'cretaceous'.
Found 2,591 results
-
The North Sulphur River was picked over but I still managed to have some good finds.
-
Hello all I wonder if anyone can help me with this invert. It is from the area between Moab and I-70, in a formation identified as Mancos Shale by a former BLM paleontologist. Roadside Geology of Utah places this area as Cretaceous. The shell is 3cm long and and about 2.75cm side. The distinguishing feature is a grove running down the center on the longer dimension. There is sign of horizontal banding. I have looked in the Atlas of Cretaceous Life online, Index Fossils of No. Amer., Invertebrate Fossils by Moore et al and “Mid-Cretaceous molliscan record from west-central New Mexico. The closest pictures I find are in Invert Fossils, p 252, figure 6-34 as suborder Productacea juresania, but this item is Pennsylvanian-Permian. There are several other earlier brachiopods that look similar, but nothing cretaceous with this indent down the middle. The indent does not look like damage, but actually structural. I think, for some reason this is a mollusk, but may be wrong. I don’t know to what extent the surface of the shell was damaged in removing the overlayer. I will post another picture. Thanks for your help. Tom
-
From the album Cretaceous Shark Teeth
An extremely rare Cretoxyrhina mantelli w/ cusplets from a new site in Morocco. -
From the album Cretaceous Shark Teeth
An extremely rare Cretoxyrhina mantelli w/ cusplets from a new site in Morocco. -
From the album Cretaceous Shark Teeth
Cusped Cretoxyrhina mantelli from Kansas -
From the album Cretaceous Shark Teeth
Cusped Cretoxyrhina mantelli from Kansas -
So, this is my first post here, and I have what I imagine might be an unusual case for this forum. I work for a travelling dinosaur exhibit, setting up a display of real fossils. Within the last year, our owners purchased a number of dinosaur fossils from a dealer (ie, an acquaintance of theirs) and shipped them to our CEO's home, who later sent them to our company's repair shop to have travel cases built, before shipping them to our show on the road. Somewhere in all of that, some of the fossils' original information was lost. I reached out to our executives who promised to look into it and get back to me, but naturally, they would forget, I would remind them, they would never get back to me, and I spent multiple months in that cycle. So, here's everything I know: I originally assumed it was a Triceratops scapula, because it had been offhandedly mentioned to me that was one of the purchases. However, I learned that the scapula was sent to our second show, and after comparing it to images of skeletons, I ruled that out. I changed my guess to Triceratops Ulna. A very well known paleontologist (whose name I won't reveal here) visited our show as part of a media promotion this summer, and when asked, took a look. He initially didn't disagree with my assessment, but a few days later emailed me, saying that after additional analysis of the pictures he took, he had changed his mind to Triceratops tibia, and later, after consulting a colleague who specializes in Ceratopsians, he asserted it was a Triceratops Fibula. Some time later, I finally talked to someone in accounting, who was able to get me the various invoices, which was somehow less helpful than you'd think it would be. But it did let me get in touch with our dealer, who is notoriously secretive and doesn't share much in terms of sourcing. She did reply to me, however, telling me it is an... Edmontosaurus humerus. Or at least that was the highlighted bone in the diagram she sent me, which is the closest piece of "official" documentation that I've seen since it was purchased. However, this looks different to the same bone on mounted skeletons of Edmontosaurus as well, at least to my eyes. tl;dr: I no longer trust anybody. Multiple conflicting identifications, I don't know where it came from, other than a mention in the dealer's email that it's from the Hell Creek formation. Company is restructuring, so getting responses from anyone is a miracle. I can upload better pictures of the fossil later if necessary. I no longer put this piece on display because I simply don't know what to call it. Help.
-
Today I had the pleasure of meeting up with @frankh8147 once again, to hunt the Cretaceous streams of New Jersey. I arrived much earlier than expected after leaving my house by 1am. So I stopped at Dunkin Donuts and grabbed a breakfast sandwich. It was still dark when I got to the site. Frank said that he would probably get there between 7:30- 8:30 so I took my time organizing my gear. As soon as it was light enough I started heading down to the stream. I startled about 8 deer as I made my way to the trail. I really appreciate see wildlife early in the morning. This was my 3rd trip to this site. I had an idea of where I would hunt until Frank got there. So I headed upstream to where I felt would be a good start. I was surprised by how many trees had fell since my last visit. Once I got to the spot I soon got to work. When Frank first told me about this particular spot, he said that the finds were more scarce but they also tended to be more of the rarer finds. Today that proved to be true. I seemed to go through my sifter many times without a single fossil. Then every once in a while there would be something, either a sharktooth, crab claw, belemnite piece, or enchodus tooth. But nothing spectacular and most not in the best condition. I knew going in, that it being the end of summer, no rain and low water levels, there was no new material so this was not a surprise. I was hoping that when Frank got there he could find a more productive spot. After a bit Frank showed up. He told me about a couple of possible spots, not too far downstream. After awhile we tried a couple different spots and not finding too much (atleast for me, Frank had a couple nice finds, that hopefully he will share later) finally it happened, I found my first Mosasaur tooth! When I saw it in my sifter I thought it was too good to be true. I have been looking for one for 12 years. It is not big as it is only 12 mm but it is in rather nice condition. I didnt get excited till Frank confirmed ID. That is one of the things that I like about hunting with Frank. He is a good guy and he is very knowledgable. I really enjoyed hearing about the different things that he has found there over the years. We hunted till about 1pm and then it was time to head home. All in all it was a good time and I cant wait to get back. Here are some pics. 1st is the mosasaur.
- 66 replies
-
- 12
-
-
- mosasaur
- sharkteeth
- (and 2 more)
-
As I'm forever on the look out for unidentified theropod teeth, just thought I'd pop this one up for a second/third opinion. It's listed online as Carcharodontosaurus, but I'm not 100% feeling it. The base width appears to be quite narrow, and the serrations seem to strongly increase in size towards the apex. The larger denticles almost look chisel shaped and there's an apparent lack of interdental succuli present too. Probably just positional variation of a Carch, but always worth a double check. Length is approx. 3.5cm. There are sadly no photos of the cross sectional view. Close up of distal denticles:
-
Seeking opinions re: probable Hesperornithiform bones (and other associated miscellania)
Norki posted a topic in Fossil ID
After numerous attempts to locate a certain elusive and geographically remote late Cenomanian bonebed in the Pasquia Hills of Saskatchewan, I was recently successful at finding some of the material and bringing it home. This bonebed was deposited approximately 94 million years ago near the north-eastern margins of the Western Interior Seaway during a period of sediment starvation, resulting in the accumulation and formation of a bioclastic conglomerate made mostly of teeth, bones, and coprolites. Most striking is the abundance of Hesperornithiform bird fossils from the site, namely Pasquiaornis. More information can be found in this study here. Individual bones and teeth are easy to extract from the relatively soft matrix which can usually be broken down either with hand tools, water, or vinegar. The most commonly occuring fossils are shark and fish teeth, including Hybodus, Ptychodus, Carcharias, Squalicorax and Enchodus. Other teeth include those of birds and reptiles, mostly plesiosaurs. Besides the teeth, bone fragments, coprolites, chunks of bentonite, pebbles, fish scales and fish vertebrae are also abundant. My question is whether the bones I have tentatively identified are from Pasquiaornis, and also if anyone has other opinions and conclusive IDs on some of the other miscellaneous fossils I've included. If necessary I can take more photos, and may keep this thread updated with further discoveries as more material is sifted. Photo 1: A sample of the bonebed before prepping. This particular chunk features relatively small fossils, others were made primarily of larger inclusions, Photos 2, 3: Some complete and fragmented long bones, suspected to be from Pasquiaornis, Photo 4: Teeth suspected to originate from Pasquiaornis, along with a suspected claw at the bottom left of the photo, Photo 5: Other miscellaneous fossils from the bonebed, including an assortment of shark, fish, and plesiosaur (?) teeth. Also a sample of some of the bone fragments, vertebrae and coprolites commonly found within the material, Thanks for your attention. Any additional information or questions are greatly appreciated.- 6 replies
-
- 2
-
-
- bird teeth
- favel formation
- (and 14 more)
-
In order to obtain more information on NJ Fossil hunting laws, specifically sharks teeth, is there a contact either at the NJ State Museum or another organization that could be a definitive voice on the subject? I personally understand the laws in Colts Neck, Big Brook, etc, but need to get a grasp on all regulations in NJ. As well, if anyone has contacts for the Florida Museum or Floridian organization for similar inquiry, I would appreciate it. Thanks for any help.
-
Here is great article about the rocks and sequence of events that happened at ground zero causing the great Cretaceous extinction: https://news.utexas.edu/2019/09/09/rocks-at-asteroid-impact-site-record-first-day-of-dinosaur-extinction/ https://www.foxnews.com/science/scientists-uncover-new-evidence-of-the-asteroid-that-killed-off-the-dinosaurs
- 3 replies
-
- 2
-
-
- chicxulub
- cretaceous
- (and 1 more)
-
What do you guys think of this tooth
will stevenson posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hi guys this is from hell creek And is described as a tyrannasurid what do you think of it -
A find from earlier this year. Creek bed on the surface here in West KY, (Graves County). Got it because it was different. (I started truly hunting fossils for my son who loves dinosaurs more than anything.) I had no idea as to what it might be but the shape kept me thinking I'd seen it before. I happened to be looking at Mosasaurs one day & happened to see a Moroccan peg-toothed specimen. Researched if they might have lived in the sea here. Saw a paper about Globidens which had some illustrations, then found out about Alabamaensis. Thought I had a jaw fragment minus teeth of one of those. Now I highly doubt it, but you are the people to ask! Who is it, JohnJ who has the quote about convincing yourself to believe anything?
-
.thumb.JPG.d64a00de120fb553baacff5149461632.JPG)
Bivalve from the Cretaceous Merchantville Formation, New Jersey
Jeffrey P posted a gallery image in Members Gallery
From the album Cretaceous
Liopistha alternata Bivalve/clam Upper Cretaceous Merchantville Formation Matawan Group Weller's Ravine Matawan, N.J. prepared by Ralph Johnson -
I found this tooth in some matrix from the Lance formation from Wyoming. It reminds me a little of a croc tooth, but could it be something else. The division markers are 1mm. Thanks
- 7 replies
-
- 2
-
-
- cretaceous
- croc
- (and 1 more)
-
That little vial of micros from the Mesaverde formation is the gift that keeps on giving. I dissolved some of small bits of matrix in vinegar. Still no batoid teeth but a couple of shark teeth did emerge. Mesaverde Formation, Rollins Member Colorado The first is a candidate for the smallest shark tooth in my collection. At most it is 1mm and I think it is another possible Cat Shark tooth. Quite similar to some NJ teeth I found on line. I am open to other possibilities as far as an ID goes. Regardless, it is one very cool looking micro tooth
-
From the album Plants
Betulites sp. Upper Cretaceous Cenomanian Dakota Formation Ellsworth Kansas USA Length 6cm / 2 inch -
Hello everyone, I was wondering what the Maximum size for a late Cretaceous Cretalamna was? I have this tooth from Mississippi which clocks in at 1 29/32” (with root chipping), and can’t find much information as to the largest size that the genus reached in the Cretaceous.
-
From the album Vertebrates
Thorectichthys rhadinus Murray & Wilson, 2013 Upper Cretaceous Cenomanian / Turonian Akrabou Formation Gara es Sbâa Agoult Morocco Length 5cm / 2" Murray & Wilson described two Thorectichthys species from Gara es Sbâa: T. marocensis with a very pronounced body depth and T. rhadinus (from “rhadinos” meaning slender, tapering or lithe) in reference to the body depth being much less than in T. marocensis. These fish are quite often mistakenly offered as Satericthys sp or Triplomystus sp. Lit.: Two new paraclupeid fishes (Clupeomorpha: Ellimmichthyiformes) from the Upper Cretaceous of Morocco. Mesozoic Fishes 5 – Global Diversity and Evolution, G. Arratia, H.-P. Schultze & M. V. H. Wilson (eds.): pp. 267-290, 8 figs., 2 tabs., 2 apps.-
- 1
-
-
- akrabou formation
- cretaceous
- (and 3 more)
-
So the new museum of Naturalis Biodiversity Centre in Leiden, the Netherlands was opened the past weekend and besides having a completely new building and a bunch of new stuff. The T. rex Trix is also back from being on tour in our new dedicated dinosaur hall. But I wanted to share something particular and I'll leave showing the rest of the new museum to others. I volunteer at the museum in the dinosaur prep lab, and over the past years the dino lab team has been prepping away at a whole bunch of Triceratops horridus specimens. It was originally found in 2013 when the museum was looking for a T. rex. Instead they found a number of Triceratops bones in Wyoming. Still wanting a T. rex they looked on. Eventually this T. rex was to be what became the Trix specimen. One of the most complete T. rexes in the world. After getting the T. rex the museum went back to the first location to start digging up those Triceratops bones. It later turned out to be probably the biggest collection of post cranial bones of Triceratops ever found divided between two sites right next to each other. I joined the team about 3 years ago. At first we were just prepping a variety of the bones to see just what we had. It was soon decided that we'd prep one of the skeletons from the upper site and mount that in the new upcoming museum. In the upper site we only had 2 individuals so that it would be easier to distinguish between the different individuals as one of them was much smaller. And now the skeleton is done and standing proud in the new museum. The specimen, now named Dirk, was named for one of the volunteers. There's quite a few bones present. All of the remains were found disarticulated and we don't have a complete skull. We have the braincase, one brow horn, left squamosal, left quadrate, right quadratojugal, both nasals and both dentaries, left articular complex as well as the rostral beak. For the large limb bones we have almost all of them. We're only missing the coracoids and the left ulna. Most of the toe bones as missing but we have a few of the hind toe bones. We have partial vertebrae of most of the back and around half the ribs. The sacrum is missing but the rest of the pelvis has all the real bones. For the tail we only have a single vert and chevron. Personally I've mostly worked on the skull bones such as the nasals and dentary as well as vertebrae. I also did some putty work on the arm bones. All of the missing bones were 3d printed. The scans are mostly based on the Lane specimen. And who knows, maybe we'll have a few more Triceratops skeletons mounted in the future. But there's still a lot of prepping to do.
- 8 replies
-
- 8
-
-
- naturalis
- ceratopsian
- (and 4 more)
-
I found this tooth in Ramanessin Brook near Big Brook. The guy leading the group said it was a broken shark tooth but he was in a hurry and barely looked at it. I don’t think it looks like a shark tooth. The first picture shows the sharp edge on the front of the tooth.
-
Picked this item up in Driggs, ID. I believe the area is Cretaceous and can see several imprints and bits and pieces but am wondering what this could be. Any ideas or help would be appreciated.
-
-Copy(1024x994)(800x777).thumb.jpg.38aefdee27c3a7e2d333c3260856fa86.jpg)
