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I recently found a small lot of mammal teeth from Sharktooth Hill. I am doing an education program about marine mammal evolution and they looked like cetacean teeth so I bought them. I am new to fossil forum but not new to collecting marine mammal fossils. I know that you can not get a species ID from cetacean teeth but I am hoping I can get a little additional information or perhaps a suspect so to speak. I believe that the first 3 pictures are of an unidentifed Odontoceti, maybe a Kentriodon of some sort. The first two teeth were both right around 1.5 cm. The third tooth was a little over 1 inch. I am fairly certain the 4th picture is of the unidentified Odontoceti species that is mistakenly called Prosqualodon errabundas by some collectors and dealers. I think it was the Coastal Paleontologist blog that said this was an undescribed species of large dolphin. It is about 1.75 inches long and has a very inflated root. The last picture looks more like an Allodesmus than a cetacean to me but I could be wrong. If anybody has an thought or opinion, I would greatly appreciate any information.

My son found this in the water at Flag Ponds Park near Calvert Cliffs. Based on a quick look at some of the displays at the Marine Museum, I think it's part of a vertebra of a marine mammal. Does that sound right? It's pretty well eroded so I assume it had been tossed around for a while and it looks like part of the exterior was broken off to show some of the interior of the bone. I'm sure it's too beat up to know the species, but based on the shape and size (almost three inches at the widest) is it possible to guess whether it's porpoise, seal, or something else? Thanks for any input.

Here are a few different pieces I picked up near Santa Cruz, hoping to learn a bit more from everyone here and get some help with ID's. My guess was a smaller marine mammal, maybe a pinniped rib?

Hello Fossil Forum! I live in Northern California, and have been learning about the geology and fossils of our area so I am very excited to have found this forum. From what I have found so far, I believe the fossils I have been collecting are from the Purisima formation based on the location and appearance. These were collected near Santa Cruz, so hoping to get some more info and possible identification.

Hi, As I described in my trip report last week (http://www.thefossilforum.com/index.php?/topic/56838-kyushu-fukuoka-pref-ashiya-machi-japan/) I went to Ashiya machi and found what looks like to me a bone. The outcrop is from oligocene period and the matrix is made of sandstone. Found fossil were bivalve, shark teeth, and turittella which suggest a sea environment. Could you help me to ID this fossil ? I will say fossil because I do not even know if this is a bone as it would be the first time I found one. I read that at this place was discovered sort of big penguin called Plotopterum and sea mammal like seals. I read somewhere that birds bones and mamal bones were quite different so even if we cannot put any ID on this maybe, I still have the hope that someone can tell me if it's a bird or a mammal. I am waiting forward to reading your suggestion and post. David

Hi, I found these 2 strange bones in a small miocene outcrop in southern california. I also found about 10 misc. shark teeth and abundant bone fragments. These bones are about 2cm long and 1.4 cm wide. What are they? Thanks.

Hi! I found this on the beach of a freshwater lake in Uruguay that has in the past been part of the pacific ocean. I think it is an inner ear bone of some marine mammal, but I don't know from how long ago or from what kind of animal. I'm sorry that there's no scale, but it's an inch and a half long, one inch wide and on average about 1cm thick and the holes are about 2mm diameter). Can anyone help?? I can give more information about the location if it would be useful. Thanks!!

A couple of finds, a couple of questions: I have found dolphin teeth, but this one seems different than the ones I normally see -- Is this just a different dolphin tooth position, or some other marine mammal? On the 2nd fossil, I have found LOTS of turtle shell, and never one patterned like this one. I originally thought it was a pigeon -- as in clay pigeon... Can one of the turtle experts ID the type of turtle? Most of the pretty pattern turtle shells are from mud turtles. Thanks for all responses