Oligocene cetacean bulla?

[wellwellwell]

Hello!

With the extension of warmer and calmer weather in my area, I have recently taken to the dark arts of sifting gravel beds in search of fossils.  Previously I have avoided this because it’s a lot of work, but I have been enjoying finding the higher quantities of fossils and other things... 

I know there are a couple of different exposures on this river’s banks, a marl with fresh shells and Miocene vertebrate material, and a reworked gravel layer with a bit more worn mixed material including either  angustidens or ariculatus shark teeth. Pictures included. These are usually very worn.  The gravel beds in the river below such deposits have been where I sift... 

In one such area I find a rich diversity of shark teeth and cetacean fossils(mostly bones chunks, earbones, and a few teeth) the whale material is the most interesting to me...

I think I found a partial tooth from a heterodont whale, it is broken and worn, consistent with the older shark material.  I hope the pictures tell the tale.  My post is about mammal earbones that have been quite frequent  and show a consistency of wear with the older material.  They also have a consistent form, though worn, that is quite different from Miocene earbones that I’ve found here and elsewhere.  I’m wondering if these are identifiable to oligocene cetaceans?

I Have included 3 pics of what I think is the heterodont cetacean tooth
2 of the older sharks teeth

2 photos of the what I think may be the older earbones (The group of 3)

2 photos of what I think are Miocene earbones 

 

All of these fossils were found in the same bed of gravel along with many more sharks teeth and whale bones and a few more recent whale teeth(they look like what I have found at other Miocene formation sites)

I’m curious if this rings any bells, I totally understand if they are to worn for an id of any specificity.  I know there are some experts on this forum and I appreciate anybody’s opinion/ thoughts!

 

thanks!

[wellwellwell]

These images seem low res I’m going to try some bigger versions of the bones/tooth in question