Oct 30, 2024 · My assumption was that lamniform sharks didn't really take off until the steady decline of the old Jurassic era regime like ichthyosaurs and plesiosaurs (pliosaurs) into the Cretaceous that were eventually devastated by the Cenomanian-Turonian (OAE 2) extinction.

Apr 20, 2024 · Hey all, Here are four teeth from the Gault Formation, Albian stage of Folkstone, Kent, UK. Am I correct that the left two teeth are Dwardius siversoni? The right two teeth have somewhat relatively bigger cusplets and they are more round. Could they be Dwardius or possible Cretoxyrhina sp.? I not...

Nov 11, 2024 · 11-15 - Worn shark teeth, likely odontaspidid 16 - Likely geological, but could be a particularly worn crocodile tooth. 17 and 21 - Look fossiliferous. Heterodontus cf. lerichei? Worn batoid tooth plates? 18-20 - More worn shark teeth, again likely odontaspidid 22 - Definitely a tooth of some description. Trichiurus sp.?

Jul 7, 2022 · So, in speaking to @digit, I was convinced to make a wooden sifter to replace my current PVC pipe one, and in doing so, make a guide on how! So first things first - I followed Ken’a tips and his post here from years ago: So the materials: - 4 pieces of 1”x3”x20” lumber. I …

Nov 10, 2024 · I found this along the Shark River in New Jersey - is it a very worn shark tooth (no enamel) or merely a suggestive rock? It even has what resembles a cusplet on one side. Also pictured are a couple other teeth fragments from the same area for comparison. Any help would be appreciated!

Nov 11, 2024 · The only one I can identify with any conviction is Sphyrna tiburo (the Bonnethead Shark) the smallest of the genus. They have very characteristic lower anterior teeth and crushing teeth for posteriors (they have a diverse diet including lots of invertebrates).

Aug 2, 2020 · Bull shark (Carcharhinus leucas): Dusky shark (Carcharhinus obscurus): With respect to 3, the ranges of the two extant lemon shark species (see below from Ebert 2013) are very different. If the fossil species had the same range as the extant two species, where your teeth were found would be a good help in the teeth id.

Jul 6, 2011 · Yes, you can find Cretaceous-age teeth in quite a few parts of Montana. I have no exact locality data but consider the following:

Dec 12, 2024 · Na pierwszy, bardzo starty ząb wybrałbym Otodus obliquus. Drugi ząb, ten większy po lewej na trzecim zdjęciu, może należeć do Jaekelotodus robustus.

Jun 17, 2015 · Ocean City Maryland is not near any outcrops of verte-fossiliferous sediment that I can think of. A large and deep excavation in downstate Delaware exposed a lot of Miocene vertebrate fossils but generally speaking the middle of the delmarva peninsula only has some very small low exposures on the eastern shore of the chesapeake along some rivers. the Choptank …