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Found 19 results

  1. A number of years back Tammy and I had a great day in the field digging for shark teeth at the Ernst Quarry in Bakersfield, CA. We were joined by longtime forum member Tony @ynot who drove down from northern CA to meet us. Those interested can read about that trip here: http://www.thefossilforum.com/index.php?/topic/60863-shark-tooth-hill-ernst-quarry-hunt-on-2016-01-22/ A number of the nicer loose teeth were wire-wrapped into necklace pendants and given away as presents and a few teeth still in the sandy matrix were prepped out for display (some of which are presently on display in an exhibit at the FLMNH display museum). The bulk of the rest of the interesting teeth are being donated to the FLMNH collection as the museum's collection was a bit deficient in STH material (a few larger teeth donated over 50 years ago). As these are going into the museum's collection I want to have good IDs on the specimens. The hooked Cosmopolitodus (Isurus) planus teeth are reasonably distinctive and I think I have a handle on at least the obvious curved uppers. The rest of them I am not certain of the proper ID and I'm hoping for some help from folks who are very familiar with this locality. I'm starting out with the larger white/mako teeth and then I'll be sorting through the smaller ones. If I have questionable teeth in some of the smaller ones I'll add additional photos. I've labeled all of the teeth with numbers and letters so that there will be no confusion in identifying which tooth we are discussing. Looking forward to getting these teeth sorted out and also learning a bit more about the shark fauna of a site that I've had the fun of collecting (if only once). Cheers. -Ken All of the teeth in image 1 look to be the Hooked-tooth White/Mako (Cosmopolitodus planus) and seem to be all from the upper right quadrant of the jaw. More help on these would be greatly appreciated: Thanks for looking. Cheers. -Ken
  2. My wife and I just returned from a trip out west (western USA for our international friends) which featured a trip to the famous Miocene site near Bakersfield; Ernst Quarry or Sharktooth Hill, whichever name you prefer. As most of you know this site it well known for the rich fauna of sharks teeth, marine mammal bones and other related items and has been written up numerous times on TFF going back over the years. We had originally planned this trip a year ago, but a family emergency caused us to reschedule. So we decided to try again this year and picked late April to try and avoid the "rainy" season and beat the start of the summer heat. One out of two isn't bad - haha. We had beautiful blue skies but unfortunately had an unseasonably early heat wave that had the temps climbing into the upper 90's! My main goal of this trip was to find some of the beautifully preserved, richly colored, good sized sharks teeth (Mako's being the most common) that I have seen millions of pictures of and read dozens of trip/ID reports about here on the Forum. It seemed with a diligent amount of work digging and sifting, I was sure to come away with a bagful of beauties! This is where my caution part comes in. We had a good trip, but the results were no where near our expectations. I have been fossil collecting for over 40 years and have had plenty of down days/visits/trips, but when we walked away with maybe a dozen teeth and the largest complete one at just over an inch long from a site that represents supposedly one of the richest around after a whole day of steady digging, suffice it to say, we were a bit let down. We worked steadily throughout the day, tried several different spots and outlasted everyone. As the day heated up most of the folks were gone by very early afternoon, we had the place to ourselves for the last couple of hours before we bailed out just after 4 pm (the car thermometer read 99 when we left). We had to be out by 5. From what I saw of about half the other collectors that I talked to, were similar results, a modest number of teeth, nothing very large. Someone may have found a ton of great stuff, but I did not hear or see it. So, my caution is not that this place is not good, don't go: no, not at all. It is to keep your expectations realistic. There is no doubt I oversold this to myself. I found some nice teeth as you will see below, just not the size or quantity that I thought was the norm out of here. It could be I had a down day, it could be I didn't know the best spots to dig, it could be the quarry just does not produce like it used to, it could be that I just didn't move enough dirt to support my expectations, it could be a lot of things. But when I raised my expectations to high levels on a trip half way across the country that this was the focus of, I guess I kind of set myself up. Keep it real!!! I mostly bring this up as I often see on here that people would love to go here, it is on their bucket list, etc, etc. Again, I'd encourage you to visit, just keep your expectations in line, dig as much as you possibly can, and you will probably find the mother lode! Ok, enough of my blathering. The trip was fun, we did find some nice teeth, the preservation of them is excellent for the most part and I am working my way through some matrix I brought back which contains some very cool little teeth in there. Here is what we found: The whole kit and caboodle with my tentative ID's scribbled on the paper towel. I will follow with close ups of most of them. This was actually the first tooth we found, just an edge sticking out of the chunk of matrix (on left). On the right is after a bit of prepping so you can see the whole tooth. I think I'm going to do a bit more shaving down but leave this in the matrix. The round object by the root is just a pebble that was in there. I also found another small sharks tooth as I was removing matrix that is no longer in the picture. These Cosmopolitodus hastalis are the most common tooth found in the Round Mountain Silt from what I read (and my 1 day experience). These Cosmopolitodus planus (Hooked or Curved Mako) were neat and more the size I though we would encounter. Unfortunately, neither of these are complete. These tiny ones we managed to see as we were sifting. Since my napkin writing I have learned they are indeed a Carcharhinus, but the species seems to be an ongoing topic of discussion (not uncommon for this genus from what I have found). In the matrix I am picking there are lots more of these but that will be a topic for a future Micro post. These three are some of my favorites, very neat little teeth. Since the napkin writing, I have found the the upper sharks tooth may not be Hemipristis but rather a Hexanchus upper anterior. If anyone can corraborate from this picture that would be great, otherwise I'll probably make an ID post for a couple of these items to sort them out. These small ones are also nice. I see I did not take a picture of the most diagnostic side of the Squalus, but it does have the finger like extension to below the root on the other side. I also have found several more of these in the fine matrix. And lastly for this group a neat little bone that I believe is a cetacean periotic. I saw another post in which @Boesse identified a similar looking one as Aulophyster morricei, but there were some differences between this one and that post which I don't know if its due to simple variation within the bone or it is a different animal. Again, if I can't get a confirmation or different ID based on this one picture, I'll be happy to create an ID thread. We also found a lot of bone, I brought home a bag full of some of the bigger chunks I found in one area. I only recognize some rib fragments (second pic) and a possible beat up vert (third pic in middle). I'm not sure what the rest of the fragments represent. And finally, just a quick bit on the matrix I brought back. I did a quick sieve separation in the field just to have a mix of different sizes. This turned out to be a waste of time as the matrix was too damp to properly sieve. When I got back home and had water available, I was able to quickly run it through a small series of sieves and get down to some pickable matrix. I used a window screen (about 12-14 mesh) and a 40 and 60 mesh sieve. 95% of the matrix was fine silt (hence the name of the Formation) and went through the 60 mesh and therefore contains nothing that I'm going to spend time on (60 mesh is 0.25 mm, too small for me to try and pick with the equipment and dexterity that I have). The material caught on the 13 mesh contained almost all the sharks teeth but only represented a small baggie of the couple gallon bags of matrix I was able to fit in my luggage. You can see in the picture below the small bag of matrix to the right and the little beaker contains about 26 cm3 of fossil material picked (about 17% of the bag volume). This is mostly small fragments of broken bone but there are lots of shark and ray teeth in there as well as a few other items (future post in Micro section). I have only looked at the 40 and 60 mesh material a little bit. The 40 has a few very small ray teeth, and some fish teeth (and more broken bone fragments). I have not seen much in the way of identifiable fossils in the 60 mesh material yet. That is all for now, thanks for following along. I appreciate any thoughts or comments on my ID's or anything else. Mike
  3. I found this tooth at Sharktooth Hill near Bakersfield, CA. It is Miocene from the Round Mountain Silt. It doesn't quite match any of the specimens at Elasmo.com with Alopias latidens being the closest. It is one inch tall. Any helpful feedback would be very appreciated. Thanks and have a good one.
  4. fossilsonwheels

    STH Pinniped tooth

    I recently got this unusual, at least to me, marine mammal tooth. I am pretty sure it’s Pinniped but beyond that I’m not sure. Marine mammal fossils are not something I have a great deal of knowledge about. I suspect it could possibly belong to an Odobenid as opposed to Allodesmus. I have never had any teeth from the STH Walruses in my collection so I’m going solely off some research I did. It’s a really cool tooth whatever critter it belonged to. Any thoughts ??
  5. The specimen was found at Ernst Quarries, Temblor formation, round mountain silt. This reminds me of a ray plate except the plate is somewhat wedge shaped, with very thin teeth (?). One longer “tooth” remains in the matrix. Sorry I couldn’t clean it up better, while attempting to do so, it popped out of the matrix. I hope to glue it back in place to complete the prep, but the risk of further damage may change my mind. This prep has revealed multiple specimens, changing the plan and approach again and again. Nice problem to have,right? The last photo shows one of three larger specimens in the original matrix. I will seek additional IDs and prep advice in separate posts.
  6. Sharktooth Hill Trip Report Part 1 – building the sifting table Hi everyone, After my first trip to Sharktooth Hill in June, I was hooked. I immediately started making plans to return and, this time I’d come better prepared. This forum has provided an amazing source of ideas and helpful people and inspired me to build a sifting table for my next trip to STH. A huge thanks to those who have helped me by answering questions, providing pictures and ideas, and helping me troubleshoot. I gathered as much info as I could and then tried to combine all the best ideas into one contraption to fit my needs. I’m excited to try this beast out next week! It’s big! The screen is 37.5” x 21” and the table stands about 4 feet tall but I will lower it if the height proves too high to load easily. I don’t want to sacrifice “wobbly-ness” though, because I’m hoping that’s going to do a lot of the sifting work for me. Plus, my son and I are 6’5” and 6’4” so a tall table should be ok. I used SCH 40 PVC and the 2 rectangular bases are glued while the 4 legs are removable to allow for compact storage/transport. In limited testing everything stayed together but I’ll bring some PVC glue with me in case I need to solidify it in the field. I'll also bring my PVC cutter for “disassembly” for the way home if need be. The bottom tier is ¼” mesh and has 6 “T” brackets to make sure it stays on top of the PVC frame. I bolted on a handle to allow it to be shaken one- or two-handed. There are no pointy parts on the inside (trying to avoid bleeding as much as I did on my last visit to STH). The top tier is ½” mesh and sits inside the bottom tier. Corner braces in the bottom tier (see above) allow the upper tier to sit low enough that it won’t dislodge but high enough that the contents can move freely across the bottom mesh. Initially I was disappointed that the large size and my inability to “tighten” that mesh caused it to sag noticeably once it was loaded up with soil. I remedied this with the addition of an adjustable bracket along the midpoint. But then when I put the top tier inside the bottom tier I realized I’d created a teeter-totter (doh!) and had to chisel out a groove on each side to allow it to fit in there. I’m very excited to go give it a try and I hope you all find this pre-trip report interesting. I’m happy to answer any questions and/or accept suggestions for improvement. And thanks again to all the helpful people on this forum whose previous pictures, design notes, and conversations encouraged me to attempt this (and make this post). I’ll send a follow up trip report after I get home. Cheers!
  7. ThePhysicist

    Carcharodon planus

    From the album: Sharks

    "Hooked white shark/mako" Round Mountain Silt Fm., Sharktooth Hill, Kern Co., Bakersfield, CA, USA
  8. We have our Secret Santa package all ready to go and just got done organizing our loose shark teeth. I found a bunch of STH material that I had set aside for a trade that never materialized. I totally forgot I had them so here they are. This is a package deal, I don’t want to split them up. Saves on shipping. This would make a cool Christmas gift for somebody and we aren’t asking much in return. Sharks- Carcharodon hastalis, Carcharodon planus, Galeocerdo, Physogaleus, Carcharhinus, Triakis, Galeorhinus, Mustelus, Sphyrna, Cetorhinus, Heterodontus, Squalus, Squatina, Batoids- Myliobatis, Dasyatis, Mobula, verts, denticles, partial stingray barb. None of the teeth are large. I believe the largest hastalis and planus are 1.5”. Very nice array of colors though. With Christmas around the corner, we’ll throw in some Cretaceous teeth from Russia too. My primary interest would be Heterodontus, Isurus (desori, oxyrinchus, retroflexus ) , scyliorhinus and other cstsharks but I’m open to any shark teeth except Moroccan stuff. PM us if you’re interested or you want a picture of something specific.
  9. fossilsonwheels

    STH Micros in need of ID help

    I am fairly comfortable with the STH micros as far as identification goes but I found a few things that I need some help with. First up is one that I am 90% sure on the ID but I want to be sure. I believe I found a couple of Raja teeth. The first one I found looks to be complete and tiny, a little over 1mm. I know skate teeth are somewhat uncommon in this fauna and this would be my first one.
  10. fossilsonwheels

    More cool STH Micros

    We recently got some great STH Hexanchus teeth from @JBMugu and he was kind enough to send us some great micro matrix. I always enjoy searching for micro shark teeth and the STH material usually provides quite a few surprises. This batch was no exception. I have only searched about about half of the matrix but so far it has given us some really cool shark fossils. I found a few Hexanchus teeth which included a tiny lower (pic 1) and a few commisural teeth. In our previous searches, we found a total of 1 partial Hammerhead tooth. This matrix was, comparatively speaking, loaded with Hammerhead teeth. We found 6 small ones, mostly complete specimens and a large one. (Pic 2) We also found an Alopias tooth, a bunch of excellent complete Heterodontus teeth including a high number of anterior teeth, a lot of Triakis teeth, and much more. I think we came across another Squatina vertebra as well. One of the more interesting finds was a what appears to be the gill raker of a Basking Shark. (Pic 3) I am posting a few few pictures and will take more later on.
  11. I have found several smaller fragments before, but never an intact one. This one turned up at the end of a very long day and I fortunately spotted it as my son was shoveling matrix into the sifting table. I startled him mid-shovel by shouting "STOP!" when I saw a row of white points sticking out of some matrix. Son was just about to throw another shovelful on top of it. Nice reflexes by him to change course mid-air to avoid me (now shielding the tooth with my body - LOL). Worth it. :-) Definitely had potential but I didn't know how much root was going to remain. After some careful cleaning I was thrilled. I can see from those cracks why I've had such a hard time finding a complete one.
  12. After posting ID questions on a couple of STH whale bones that were mostly unidentifiable, I decided I'd post images of the one whale fossil I have that seems like a slam dunk ulna (Aside from an easily ID'd ear bone.). It may be debatable as to which specific family category, but at least its location on the whale is pretty certain, right? Too bad it's a partial, but it's all I have. It looks a lot like one that is called Tiphyocetus temblorensis in an image from the California Academy of Sciences. Tiphyocetus Temblorensis Even the mottled coloring is similar. As I mentioned, this specimen is from Bakersfield, Shark Tooth Hill area specifically. While people may have seen a fair number of these, I thought it was cool enough to post an image or two of. And, people will be happy to know, I don't entertain any thoughts of its being part of a whale jaw. In fact, I'm over-jawed about having this one. Cheers.
  13. Hello, While sorting through my Sharktooth Hill micro matrix I came across some very distinctive teeth that I'm hoping someone can identify. Image 1 shows three very similar teeth in different orientations. They differ from most others I've been seeing in that they ha ve 3 roots and three "tiers" - best shown in the orientation of the specimen on the far left (root, base, top). The other teeth in images 2 and 3 remind me of Squalus and I suspect that's what they are. But they seem to be missing a part (the exact same part) and don't appear to me to be obviously broken. Is there anything else they could be? Thank you very much!
  14. ScottM

    Unusual STH tooth

    Going through my recent find from Sharktooth Hill I came across this one that was very different from any others I've seen from there. Possible bramble shark? Not many options that look like this. Your thoughts on it are appreciated! Picture isn't the greatest, but I'm hoping it's distinctive enough.
  15. Hello, I'm new to this but hoping to get more involved. I went to the world-famous Sharktooth Hill (Bakersfield CA) last week and it did not disappoint! I am now trying to ID the ~150 teeth we found but I'm not very good at it (yet?). I did a bunch of the easier ones and had some on-site help from more knowledgeable collectors that was great. Lots of unknowns still, though. If anyone could offer any tips for how to go about IDing these teeth, that would be awesome (ex. Carcharhinus spp. Vs Negaprion? Or Isurus/Carcharodon planus Vs hastalis?) I also suspect I have some Isurus oxyrinchus/desori but not sure how to distinguish them from the rest. So, please feel free to point out what you think any of the pictured teeth are, and/or what features I should look for to get better at this. I can send additional angles of anything that might be helpful, as needed. Thanks in advance!
  16. When I started going through the package of donated STH fossils we got this week, this little fossil jumped out at me. It is a cetacean ear bone and it looks similar to a photo I saw of an ear bone identified as Liolithax kernensis, a primitive long-snouted delphinoid. I believe it is a fairly common find in STH. I can not be sure with the limited knowledge I have but it did look very similar. The more information I can get, the more information I can pass on to the kids so any opinions are welcome.
  17. Hello, found this tooth in the Round Mountain Silt formation in Bakersfield this weekend. The tooth had serrations, but they are worn down. At first I thought the tooth was a small meg, or a large hemi. Upon closer inspection it does not seem to fit either of those species well. The root is not consistent with that of a meg nor a hemi. Now I am thinking it could be some kind of Requiem shark. What do you guys think?
  18. From the album: Sharktooth Hill

    Family Dermochelyidae (leatherback turtles) Psephophorus californiensis Carapace Plates. The Upper shell (or carapace) are characteristically comprised of bony segments that interlock like a jig-saw puzzle. Miocene Leatherback Turtles attained lengths of 12 feet or more. The carapace were composed of 100 or more of these plates.
  19. RickCalif

    RayTeeth

    From the album: Sharktooth Hill

    Ray Dental fragments.....Slow Curve...Ernst Quarries.
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