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Hello Everyone! It's been a minute since I've had the pleasure of finding any fossils worth posting here, but I was lucky enough today to squeeze in a couple hours of hunting. I noticed several sets of footprints around my usual hunting site - others had picked through the material recently. Undeterred, I made my way along the river visually scouring every square inch of exposed grey-brown Oligocene formation and gravel. Im glad I stuck with it because I was rewarded with several nice (albeit small) teeth from the extinct mega-tooth white shark, Carcharocles angustidens as well as a slew of smaller teeth. Then, just as I was ready to start hiking back to the car, I noticed the root of a VERY large mako tooth sticking out of the ground. When I pulled it up I was reminded of the sword in the stone..it just kept going and going. At a little over 2.8" it's one of the largest Isurus desori teeth I've ever personally seen. It's in great condition with exceptional color to boot. Thanks for taking a look and as always... Happy hunting! SOSC

I recently found this large 2.5 inch Isurus desori tooth and it got me thinking… what is the largest Isurus desori/oxyrinchus tooth out there? Feel free to post some large ones!

Hey all, I wanted to share a large Isurus desori tooth I found this weekend in Charleston, SC. It measures just over 2 1/4 inches and is the biggest I have personally found!

Hello. I found this tooth about a year and a half ago in the spoil piles outside the Aurora Fossil Museum. I was wondering if anyone could help me identify it? I think it might be a mako tooth (Isurus oxyrinchus?). Also, does anyone know why one side of the root is much smaller than the other? Is that damage? Or maybe due to jaw position? Thanks for your help.

Hello. I was wondering if anyone could help me with some fossil identifications. Thanks for any help. First, here is a Green River formation fish plate. I know the fish are Knightia, but I don't know how to differentiate the species. I think they are Knightia eocaena. Can anyone confirm the species? Thanks. Next, here is a shark tooth I found while digging on the Ernst ranch in Bakersfield, California. It is either Carcharodon hastalis or Isurus desori. I'm not great at telling the two apart. Can anyone confirm the species? Thanks. Last, here is an ammonite I received from caldigger. He identified it as Aioloceras besiaiei. I think the species might have been misspelled and is supposed to be besairiei. I've seen these sometimes referred to as Cleoniceras. Does anyone know the difference between Aioloceras and Cleoniceras? Thanks.

Despite several visits to Sharktooth Hill and hundreds of teeth, I've yet to confirm a shortfin mako (Isurus oxyrinchus or is it Isurus desori?). Perhaps this is a possible candidate. Or maybe another C. planus or C. hastalis lower. To me, the features that make this one look different from those other common STH teeth are that it is relatively long with a narrow base/wide root, and also that little bend at the tip when viewed from the side (I think it shows up in the bottom two pics ok). It just stuck out as "something different" and I was able to eliminate a lot of other possibilities. So maybe I got my first shortfin mako? Thanks for your help!

We know that fossils are not the priority for people at the moment. They are not for us either but I have found a good amount of stress relief in going through a large donation we got. The material is all from STH and we have enough to make a trade. It was part of the donation actually. Extra fossils for sale or for trade to improve our collection. I would like to avoid sales or doing smaller trades just for shipping reasons so I decided to put the trade stuff out as one lot. Given the current state of the world, consider this a post corona virus trade offer. We would probably not ship for 2-4 weeks if not a bit longer so we would not expect immediate shipping. Nobody needs to risk a trip to the post office. I did however want to put it out there. I think a little engagement among fossil nerds may be a good thing at this time We tried to put together a pretty decent representation of the shark and ray fauna plus a variety of colors. Miocene Temblor Formation, Round Mountain Silt Member Kern County, California Carcharodon hastalis- 8 teeth, variety of positions, variety of colors, none bigger than 1.5" Cosmopolitodus planus- 8 teeth, upper and lower, beautiful color array Isurus desori- 1 tooth Hemiprisitis serra- 1 symphyseal tooth Hexanchus andersonii- one partial tooth (I think upper) Heterodontus- 1 lateral tooth Physogaleus- 4 teeth Galeocerdo- 3 teeth Carcharhinus- 3 teeth Squatina Squalus Galeorhinus Included but not pictured- a couple of Cetorhinus teeth and a Mustelus tooth. Various Batoid fossils. We are open to any shark tooth offers but we do have some specific needs/wants. I listed them below. GW teeth Squaliformes- any family except Squalus Orectolobiformes- Hemiscyllium, Rhincodon, Ginglymostoma (Eocene & Cretaceous) Otodus sokolovi Isurus oxyrinchus and retroflexus some specific Cretaceous material- Cardabiodontid, Squatina, Ginglymostoma, Cretorectolobus, Odontaspis, Cantioscyllium, Cretoxyrhina PM us if you have any questions, need to see additional pictures, or want to make an offer.

Hey everyone! I’m just looking for a confirmation seeing as i’m not very experienced. I found this in Summerville, SC, sticking out of the chandler bridge formation (late oligocene). I believe it is a tooth from the extinct mako, desori? Sorry, I don’t have anything to scale it with but it is about 1.75 inches long.

Does anyone else get confused between Isurus Hastalis and Desori? For example some hastalis lowers kinda look like desori. Is there a good way to tell between the two for sure?