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Showing results for tags 'serrations'.
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I decided to separate the 2 finds here from my finds from Saturday. One is pretty enough to have its own thread.. This is a upper jaw section of Hemiauchenia macrocephala from the University of Florida Vertebrate Paleontology Database. M3, M2, M1 upper right maxilla Here is almost my best find Saturday... As I picked it out of the sieve, I knew it was an upper jaw camelid, most likely Hemiauchenia. I took it over to my kayak and snapped a couple of photos. I have been educated , mostly by Harry in other threads to recognize 100 % enamel teeth (no dentine or cementum) and what that means... In this case, an young adult camel has a barely erupted tooth, still in the process of growing roots, when it was likely killed by a predator a couple of million years ago. (I like to imagine stories). Look at the 2nd last tooth ... all enamel, a bare hint of root... Initially I thought this might be the M2, but looking at this last photo, comparing to the UF 271830 jaw, I switched to the M3.. Can you see why? I sent it to Richard Hulbert last night asking insight on the filigree pattern. I said "almost" above... There is a broken fragment of a tooth that I almost tossed (NEVER toss anything you do not recognize as a rock). Serrations on a 50 mm fragment !!!! That gets my imagination going. While Megs are all over Florida, there has never been a fragment found at this location.. It is not impossible that a Meg might have wandered in to an unlikely location.. Another possibility is Great White.. We have found some small GWs, but none over 2 inches.. This would be from a max sized GW... So , shark experts could tell me what they know about serrations from larger sharks. these look uniform . exact same size... and if someone does not recognize this as Meg or GW there is yet another possibility of large teeth with serrations...
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I recently added a few new big teeth to my collection which prompted me to take some pics of the largest teeth I have from 3 species - Carcharodon hastalis, Carcharodon carcharias and Otodus megalodon. One of the recent acquisitions is the 2.7" C. hastalis. It's not in great condition but it's not every day you come across a specimen this size so I had to buy it! While the 2.7" C. hastalis and 2.6" C. carcharodon teeth are approaching maximum size for each species.... the O. megalodon teeth make them look small. A little perspective on just how large that shark got!
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Can anyone tell me what type of shark this came from? I found it in Caspersen, FL. It’s 3/4in.
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Big spinosaurus tooth with Pathology and serrations?
JorisVV posted a topic in General Fossil Discussion
Here by my new Spinosaurus Aegypticus tooth from Taouz, Morocco. It is 4 1/2 inches. The colors are less common than your regular Moroccon Spinosaurus teeth. It has 0 restoration done to the tooth, and the quality is very high. Which I find special about this one. Noticed some slight patho and serrations on this tooth too? Could someone explain the patho perhaps.
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Why are mesial serrations more worn than distal?
Nanotyrannus35 posted a topic in Questions & Answers
This is kind of an oddly specific question, but out of the four theropod teeth that I have, all of them have the mesial serrations worn down, while the distal are pristine. Is this due to feeding wear? Or environmental factors? Could it possibly be that the mesial serrations are more fragile? Thanks for any answers. -
Hello! I apologize for my long absence. I transferred over to UW-Madison back on January, so I’ve been busy with school and life. I have messaged other members in the past about this enigmatic theropod tooth that I had purchased from a friend here on the forums a few years ago. I’ve been told that it is either Dromaeosaurid or Tyrannosaurid, but I’m still unsure. Since I am interested in studying vertebrate paleontology studying the Mesozoic era, a paleontologist at UW-Madison invited me into the lab and we got a decent enough picture of the (rather worn) serrations on this tooth. He’s not quite sure himself, mainly because he mostly works with Triassic materials pertaining to Phytosaurs. Regardless, I got this tooth for a great price and I still love it.
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From the album: Nanotyrannus35's Dinosaur Teeth
About 1 inch long. Gifted to me by @Troodon-
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I'd gotten this tooth fragment from the lance formation of Weston county, Wyoming, it has some serrations and I think that it might be identifiable. The curvature of the fragment. And with this last one, I'm not sure if I'm doing it right. A photo of the tooth with a millimeter scale to show serration density. (it seems to me that there is around 3 serrations per millimeter) Thanks for any help.
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From the album: Sharks
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- carcharodon
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From the album: Dinosaurs
Tyrannosauridae Hell Creek Fm., Powder River Co., MT, USA ~ 3.6 / mm Notice that the enamel is still clear, with the dentine visible underneath. If Nanotyrannus is valid, then this is Nanotyrannus. -
Hello, I found these in a bowl of Otodus obliquus teeth in a jersey shore gift shop. I’m assuming they’re from Morocco. The serrations tell me they’re something different but I don’t know what. Any ideas?
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Recovered the below bone from the Peace River a few weeks ago and put it aside thinking it was a partial bird bone or small reptile. On closer examination I can see serrations running along the length of the two sides. This now has me thinking Ray barb. The specimen is 26mm long by 10mm at the wide joint end. Any input would be appreciated. Thanks.
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From the album: Dinosaurs
To me, serrations are such a fascinating tool. They were independently evolved many times in many different animals. They concentrate force into smaller points (increasing the pressure = Force/Area) so that the thing being bitten would break or cut along the line of serrations. They also are great for "sawing" through things such as muscle. T. rex definitely made great use of this adaptation. Topmost (greyscale) image from "Physical evidence of predatory behavior in Tyrannosaurus rex:" https://www.researchgate.net/publication/249649164_Physical_evidence_of_predatory_behavior_in_Tyrannosaurus_rex Most of the pictures (color) in this collage are from two associated fragments of what I am certain was a T. rex tooth from the Hell Creek Fm., SD based on the size and shape of the serrations. The images with the scale markings have been scaled to match each other. More on theropod serrations: "Developmental and evolutionary novelty in the serrated teeth of theropod dinosaurs:" https://www.nature.com/articles/srep12338 -
TEST DATA NEEDED - Quantitative Method for Identifying Campanian Age Tyrannosaurids of North America
dinosaur man posted a topic in Questions & Answers
This experiment is by @Troodon, @Omnomosaurus and me @dinosaur man. Thank you for participating!!- 9 replies
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Been doing some work with a dissecting scope and noticed this serrated barracuda tooth. Tooth is from the Old Church Formation (Oligocene). Is this common for small barracuda teeth?
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Tyrannosaurus Rex tooth fragment (serrations)
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
Closer view of serrations. -
Tooth of a velociraptorine raptor. Specifically the serrations of the tooth are typical of Saurornitholestes.
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From the album: Fossil Collection
Tyrannosaurus rex tooth fragment from the Hell Creek formation. -
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Marine Fossil Three Serrated Edges Late Pleistocene to Pliocene Southern California
MightyPretzel posted a topic in Fossil ID
Happy holidays everyone. I would greatly appreciate help identifying the following specimen. It was collected in the Santa Susana Mountains of Simi Valley, Ventura County, California. It came from the Saugus or Pico Formation. Saugus is late Pleistocene to late Pliocene while Pico is middle Pleistocene to Pliocene. My uncertainty regarding the exact formation arises from the fact that (1) it was float material already weathered out of the formation it came from and (2) based on limited research and knowledge, I believe there has been a lack of consenus regarding differentiation of the two formations (see recent work by Richard Squires et al. in Valencia and R. Squires in Newhall). I assume it is marine since all of Pico is marine and Saugus is non-marine to marine. At first I thought it was a shark tooth when I picked it up but I threw that thought out the window when I realized it had three serrated edges. Measures 22 millimeters long and 6.5 millimeters wide. It is 4 millimeters tall on one end and 9.5 millimeters tall on he end that has the needle structure. There are three to four 'bumps' on both long sides on the end with the needle. The bumps look evenly spaced. I can and will do my best to provide additional info if needed.
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Hi! I have a tooth tip from hell creek formation but I dont know if its nano or rex, the serration count fits within the t-rex range with 2 serrations/mm , but I do think its quite slender for a rex tooth. What do you think? I tried my best to get a photo of the serrations but it wasn't very easy. The tooth tip is just 16 mm.
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Hey all, I am once again coming to you, as this board has some incredible people on it with a vast wealth of knowledge. I have a question about the genus Pseudocorax. Do they have serrations, or don't they? Welton and Farrish write that the crowns of P. granti are smooth..."cutting edges smooth and very thin." Yet I see photos on the net of P. affinis that definitely have serrations. Does ones specie of Pseudocorax have serrations while another doesn't? Thank you in advance for any information relating to this! Randy
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Hey everyone, I don't have a lot of comparative material at hand, so I am asking for your help. I am working on a large shark fauna from the Cabezon area of New Mexico. The teeth are very beat up, possibly due to wave action on offshore sand bars. However, upon close inspection of the better teeth I have discovered that the serrations on the lingual side of the teeth contain indentations (or possible enable folding...see the photo). I have some squalicorax teeth from the Turonian, about 25 miles from this site, that were described in the New Mexico Museum of Natural History and Science Bulletin 52 (Bourdon, et. al., I was the tail end author) that also have these features. The closest we could identify these teeth were to slap a cf. or an aff. on them. Those of you who have identified to species squalicorax, could you check and see if they also have these lingual indentations or folds? Are these normal on all squalicorax species? Thank you!!! Randy Pence
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I have done some more research on the squalicorax that I posted about a few weeks ago. I ended up examining 886 teeth or fragments thereof. Of these, 79 showed a fossilization process in which the serrations (and sometimes the whole cusp) was covered with a white mineral. 48 were so worn that sometimes the serrations could barely be made out. 254 were too small or fragmented to be of any use (which does not preclude that they were of the same species as the rest). The remaining 632 all had the ornamentation that is so unusual. They can be found only on the labial side of the cusp (forgive my previous posts saying that they were on the lingual side...a stupid mistake on my part), and the majority are on the mesial edge of the cusp, although a smaller percentage have the ornamentationon the distal edge, and even fewer have them on both. . There are three types of ornamentation, the least common being a horizontal band below the top of the cusp. The second type consists of a small circular indentation, and can be found anywhere on the serration. The most common is a vertical triangle, with the apex of the triangle towards the top of the serration. I have no clue as to whether this is due to ontological heterodonty, sexual dimorphism, placement within the jaw, or something else. If anybody could check their S. falcatus examples (the closest that these teeth resemble), or any other Coniacian squalicorax, and see if this ornamentation is found beyond the fauna I am working on. I have corresponded with Mike Everhart (Oceans of Kansas), and this is new to him. All help will be greatly appreciated! I will post two pictures here, then two more immediately after. Thanks again! Randy
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From the album: Sharks and fish
Hybodus Houtienensis shark spine Permian to Cretaceous shark (impressive!!!!!) beautiful serration teeth down the back. -
I came across this tooth in a local shop. Could only get two pics but I zoomed in on one to show the cutting edge. The tooth is labeled "carnosaur" and it's close to one inch in length. Not sure if this tooth is dinosaur or crocodile. I came across a previous thread here on the forum with pictures of a similar cutting edge that suggested it may be a mosasaur. Hoping for a possible ID before a possible purchase. Thank you!
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