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Found on a fossil hunting guided tour in Morris island South Carolina

I am doing some research on some of my newer interesting finds and am struggling a bit on this ray mouth plate: I have a local book that lists it as a Pleistocene cownose ray (Rhinoptera sp.), but in doing literature searches, I cannot find any pictures that have the same design for the "adjoining teeth" (I know that specimens this complete are hard to find). I understand that there are multiple species of Rhinoptera and that it is difficult to tell them apart. I am also finding conflicting information on when the Rhinoptera genus came about (so far, I have found Oligocene, Miocene and Pleistocene). I found this in a creek that is heavily Oligocene but where I have found a layer of Miocene fossils, which I believe (if I understand what I have read) is actually a Pleistocene lag deposit. Can anyone clarify if this can actually be IDed down to the genus (and if Rhinoptera is correct)? Thank you...I have spent the last two days just trying to gather enough information for two fossils for the Collection Reference Museum.

I thought I posted this earlier, but I don't see it, so I assume it didn't save. My apologies if it's a duplicate! I'm having trouble IDing this tooth, found in Summerville in a creek that has mainly Oligocene but definitely has some Miocene from an overlying lag deposit: Slant height is 23mm, width is 17mm. Here are my thoughts: 1. Sand tiger: curve is consistent with sand tiger, but it doesn't have cusps, a nutrient groove, the "bulge" typically in the center of the root, or the typical root shape. Other sand tigers I've found here, all having the root bulge: 2. C. hastalis: both the root and crown seem a little narrow for a hastalis, and the tooth has perhaps too much curve. New tooth on left, with two other hastalis (I believe): 3. I. oxyrinchus: the crown does feel more "blade-like", but the root shape just doesn't match, and the crown seems a little narrow. New tooth on right next to what I believe is an oxyrinchus: So, what am I overlooking? Also, feel free to correct any incorrect IDs on my comparison teeth. Thanks for the help!

Found this tooth in the Summerville area yesterday in a creek that has both Oligocene and Miocene fossils (Miocene comes from a Pleistocene lag deposit). My guess is a thresher of some sort, as I found 3 other threshers there yesterday, but this one looks different than the others (and the 4 or 5 other ones I've found in the last year). I just don't know what else it could be, if not thresher. The root here made me think Paratodus, but it otherwise doesn't look like a benedini: Two more typical threshers found in same creek yesterday (ones I find usually have little cusps also): New tooth on right, tooth previously IDed on forum as thresher on the left: 14 mm slant height. Root is 4 mm thick at thickest part, while the blade is only 1-3 mm. Thanks for any input!

I found two fossilized jaw segments yesterday that I need help IDing, please. I believe the first is either barracuda or wahoo, but I've done a little research and am still not sure how to tell them apart. My guess is wahoo, based on the tooth thickness increasing as it gets closer to the root, but some descriptions I've seen of wahoo teeth describe them as "needle-like", which these are not. Jaw section is 50mm long. Tooth goes from about 1 mm thick at the point to about 5mm at the base. Found in an area that is heavily Oligocene but with a small amount of Miocene (coming from an overlying Pleistocene lag deposit). Jaw #2 I believe is cetacean... something like an echoventator. I previously found a similar one in the same creek, but the spacing between those teeth were greater (both have the double-root teeth). This creek is also Oligocene with some Miocene from overlying lag deposits. 62mm long and 32mm tall. Wet to show the double-root tooth sockets better: New jaw on left, other from same location on right: I hate to @ people if I don't have to but, from reading old posts, I think @Al Dente and @MarcoSr can probably ID wahoo vs. barracuda. Thanks so much!

These are some bits of coral and a shark tooth I found on the beach at Myrtle Beach, South Carolina, this morning. Obviously there's not much geologic context, so I don't expect much, but can anyone tell me more specifically what they are? Or how old they are (are they even actually fossils?)? The scale bar in the shark tooth photo is about a centimeter.

The era between the Miocene and Pliocene (23-2.3 Million Years ago) was, like the Carboniferous era 300 Million Years before, a golden age for the Chondricthyans. Not only was there a massive explosion in the diversity of grey sharks, but there was the emergence of perhaps the largest number of large macropredatory shark genera (sharks greater than 3 meters (10 feet) in length) currently known in Earth's geologic history. This includes the Giant Thrasher Shark Alopias grandis (which grew up to 13 meters (feet) in length) and the famous Carcharocles (Otodus) megalodon (which grew up to 17 meters (55 feet) in length). https://www.science.org/doi/10.1126/sciadv.abm9424 But this golden era of the giant macro predatory sharks wouldn't last, for between 3.8-2.4 Million Years ago there was an extinction event of large marine fauna that killed at least 14% of large marine fauna genera, including Carcharcoles (Otodus) megalodon. Though it's not entirely clear what caused this extinction event (some have hypothesized it could've been a mild gamma ray burst), C.megalodon's decline was due to the closing of the Isthmus of Panama by 4.5 Million Years ago (an area that was a C.megalodon nursery), a decline in diatoms that caused a decline in the food sources of many whales like Cetothere whales including Cetotherium (a known food source of C. megalodon), and Competition with the recently emerged Great White Shark (Carcharodon carcharias) and Orcas (Orcinus). By the extinction events end, most of the Miocene's large predatory sharks were extinct. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6377595/ https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0084857 https://www.researchgate.net/publication/318160879_The_Pliocene_marine_megafauna_extinction_and_its_impact_on_functional_diversity https://royalsocietypublishing.org/doi/10.1098/rsbl.2020.0746 But there was a few genera that survived the extinction event 3.6-2.4 Million Years ago and lived long after it. These surviving taxon (likely surviving due to relying on different food sources then other large sharks of the miocene-pliocene) lived previously alongside C. megalodon and some survived up to at least the early Pleistocene (120,000-100,000 years ago). Here's a list of the large (non Great White Shark (Carcharodon carcharias)) macropredatory sharks of the late Pliocene-Early Pleistocene (If I'm missing any examples, let me know and I'll quickly add them). Hemipristis serra (Hemigaleidae, grew up to 3-5 meters (10-16 feet) in length) (Miocene-Pleistocene (Pleistocene strongholds: What is now Indonesia, Taiwan, South Carolina (U.S.), Alabama (U.S.), and Florida (U.S.)), 23.03-0.012 Million Years ago) Reconstruction 1 and 2 Image by artist @Tetrtophoneus, Image credit: https://www.deviantart.com/teratophoneus/art/Hemipristis-serra-871902574 Image by artist @HodariNundu (the two sharks below and next to the juvenile C.megalodon at the middle top are adult Hemipristis serra), Image credit: https://www.deviantart.com/hodarinundu/art/Mobbing-Meg-885731702 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=83182 https://www.fossilguy.com/gallery/vert/fish-shark/hemipristis/hemipristis.htm https://www.researchgate.net/publication/364591134_A_previously_overlooked_highly_diverse_early_Pleistocene_elasmobranch_assemblage_from_southern_Taiwan Parotodus benedeni (Otodontidae, grew up to 7.6 meters (24.9 feet) in length) (Oligocene-Pleistocene (Pleistocene strongholds: What is now South Carolina (U.S.)), 33.9-0.012 Million Years ago) Reconstructions 1 and 2 Image by artist @imAdro, Image credit: https://www.deviantart.com/imadro/art/Parotodus-benedeni-908901669 Image by artist @SameerPrehistorica, Image credit: https://www.deviantart.com/sameerprehistorica/art/Parotodus-Size-882947974 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=389883 https://www.petit-fichier.fr/2013/01/27/kent-b-w-1999-taille-parotodus-benedenii/? https://www.researchgate.net/publication/337937278_2019-canevet-a-review-of_the-extinct-genus-Parotodus https://www.app.pan.pl/archive/published/app63/app004542018.pdf http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&taxon_no=389883&max_interval=Quaternary&country=United States&state=South Carolina&is_real_user=1&basic=yes&type=view&match_subgenera=1 https://www.cambridge.org/core/journals/paleobiology/article/chondrichthyan-fossil-record-of-the-florida-platform-eocenepleistocene/2835CCEC27DC8EE0B24A5B62B1416618 Cosmopolitodus hastalis (Lamnidae, grew up to 5-7 meters (16.4-22.9 feet) in length) (Oligocene-Pleistocene (Pleistocene strongholds: What is now Japan, South Carolina (U.S.), Alabama (U.S.), and Florida (U.S.)), 30-0.012 Million Years ago) Reconstruction Image by artist @artbyjrc, Image credit: https://www.deviantart.com/artbyjrc/art/Going-to-need-a-bigger-boat-Lamnid-sharks-837971394 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=265174 https://actapalrom.geo-paleontologica.org/Online_first/Chan_Cosmopolidus_planus.pdf Note: Cosmopolitodus hastalis was an ancestor to the extant Great White Shark (Carcharodon carcharias), along with living alongside the Great White Shark (Carcharodon carcharias) between the Miocene-Pleistocene. However, Cosmopolitodus hastalis’s being a member of the genus Carcharodon has yet to be confirmed). I hope you all find this helpful?

I found a really interesting bone a week ago. Tonight I found a Research paper. Oligocene pancheloniid sea turtles from the vicinity of Charleston South Carolina U S A A Map of where these Sea Turtles were found: A photo picture of a right Humerous of a turtle named Carolinochelys wilsoni. It is approximately 16 cm in length, My find, basically a distal half of a Sea Turtle humerus is 8.2 cm. I am feeling good tonight. Sharing the joy. Morning coming quick. Going out hunting at 5:30 AM. Goodnight, Jack

I found these in a creek in Summerville SC. I’m still new at this and not sure what they are exactly. Any help I’d appreciated.

Hi there. I am new. I am hoping to see awesome stuff here and learn! And share what little I have and may find. Thank you for accepting me.

Hi there! I am new to not only this group but sea combing/searching for neat stuff. I was lucky enough to find a fossil sea urchin on my trip this past week to Myrtle Beach. I also found this. Initial (and secondary) thoughts had me thinking it was just a shell; however, after some more looking, something told me to hang onto it and look into it. Does anyone have an idea what it may be (or just a shell)? Thank you in advance.

Is this a symphyseal tiger shark tooth or something else? I'm struggling to get good pictures, since it's only an 8 mm slant height, so hopefully these will do. Compared to a posterior tiger: Thank you!

Hi everyone! I recently acquired a menagerie of fossils from South Carolina rivers and these three stood out. The first two appear to be skull pieces, most likely from fish but I have no idea what type. The last one I think is some sort of bizarre tooth though I have no idea from what. Cetacean maybe? Not sure exactly where in South Carolina these were found either unfortunately though lots of Megalodon, Auriculatus, and Hastalis were found with them so for age I'm guessing late Oligocene to early Miocene though there were some Pleistocene mammals mixed in as well. Any insight is appreciated as always! 1. measures 38.53 mm long, 28.39 mm wide, and 10.88 mm thick 2. measures 39.91 mm long, 26.65 mm wide, 12.06 mm thick 3. Not sure how teeth like these should be measured on the forum so I'm just going to measure it like a dinosaur tooth. "Crown height" is 29.04 mm, "Crown base length" is 21.74 mm, "Crown base width" is 9.29 mm