Rappahannock creek and beach

[Rowboater]

Not many teeth but found a few cow shark (two only pieces), a few pretty small makos and a tiger shark tooth.  Two pieces similar to others IDed as sturgeon plate pieces.

 

Of the cow shark teeth, one is typical a few serrations; a second looks slightly different, stained but no serrations nor extra points (no apparent break); an upper tooth, a root with two points and two points with no roots.  The little makos (less than an inch=2.5 cm each) are perfect (nice for jewelry?).  Decent sized tiger.  Only a few sand tiger and a bunch of triangular, gray shark teeth,  Several drum teeth (but no angel teeth?) and a few skate teeth.

 

An interesting coral(?) rock, not the typical Miocene star corral.  Have to figure out how to post; copy paste didn't work.

 

 

[Rowboater]

[citronkitten]

Looks like a nice variety there!

[Andúril Flame of the West]

Nice cow shark teeth. I have been following your reports for a short while now and am also curious as to what could be the cause of the variation you are seeing in the cowshark teeth. I wonder if anything similar could be recorded somewhere in the literature...

 

The last piece is certainly different from what you usually find. The photograph is a bit blurry and details are difficult to make out, but I surmise that it could be a Paleozoic erratic with a coral or bryozoan. I have encountered abundant Cambrian-aged erratics in the Aquia formation containing Skolithos linearis burrows. Perhaps this could be a similar case. 

[Coco]

Hi,

 

The hexanchidae show a large heterodontia* on their upper teeth, while their lower teeth are all the same (long and with many denticles) except for the symphyseal tooth which is different.

 

Coco

 

Article in my signature about the selachian heterodontia.

[dries85]

Here's a Notorynchus primigenius jaw artificial tooth set put together by Stephane Knoll in his book 'Neogene Sharks of Antwerp'