Jump to content

Placoderm Find Likely


trilobite nut

Recommended Posts

Was cruising the south pit in Arkona today. Met up with Rick and spent the day searching with him. I saw a big slab of limestone and something looked funny, so I started hammering a chisel very delicately. This is what I uncovered and it was enough for me to go back to the van and get the cement saw to cut the rock and bring it home. I'm pretty sure, as is Rick, that it is a placoderm fin...we'll see what else is in there!

post-12582-0-74315400-1397960143_thumb.jpg

Edited by trilobite nut
Link to comment
Share on other sites

Well, working through the limestone and that ain't no placoderm fin. I have no idea what it is right now. I'll post pics when I'm closer to making it identifiable and ask for assistance in that. :)

Link to comment
Share on other sites

I suppose this post should have gone into the Fossil ID thread. Sorry about that, but I was pretty sure what I had...now, I still am but it ain't what I thought I had...I think...anyway, blasted the limestone away, and found this thing to be much bigger than I thought. Researching, I found the shape, color, texture, species of brachs in the matrix around it, were all very well in line with what I found on page 220 of the book, Strata and Megafossils of the Middle Devonian Silica Formation; Herbertocaris wideneri, which is further described on page 222. I believe that this piece I have may be a piece of the lateral caudal process. It appears the animal had a caudal plate where the process attached to the body. This plate is illustrated to be roughly the shape of one end of this piece I have. Everything else, you will see in the pics. I say Hebertocaris, not only for the factors listed, but the size of the specimen too.

Any and all opinions are welcome and valued.

post-12582-0-79629300-1398299074_thumb.jpg post-12582-0-45292500-1398299088_thumb.jpg post-12582-0-73775200-1398299101_thumb.jpg post-12582-0-05432300-1398299117_thumb.jpg post-12582-0-56323100-1398299132_thumb.jpg post-12582-0-84974400-1398299141_thumb.jpg post-12582-0-52462000-1398299158_thumb.jpg post-12582-0-60303900-1398299168_thumb.jpg

Edited by trilobite nut
Link to comment
Share on other sites

Cool find, Jim!

I did't realize phyllocarids got so big!

Thanks for posting it.

Regards,

    Tim    -  VETERAN SHALE SPLITTER

   VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png    VFOTM  --- APRIL - 2015       MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg        IPFOTM -- MAY - 2024   IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png

_________________________________________________________________________________
"In every walk with nature one receives far more than he seeks."

John Muir ~ ~ ~ ~   ><))))( *>  About Me      

Link to comment
Share on other sites

Sorry Jim, not my area of expertise.

It does look like one pic I found of Protitanichthys. >HERE<

But, I don't know - most of the placoderm arthrodire bits I've seen have had bumps all over them.

But middledevonian is probably more familiar/knowledgeable about your area.

I would defer to him in this.

Regards

Edited by Fossildude19

    Tim    -  VETERAN SHALE SPLITTER

   VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png    VFOTM  --- APRIL - 2015       MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg        IPFOTM -- MAY - 2024   IPFOTM5.png.fb4f2a268e315c58c5980ed865b39e1f.png

_________________________________________________________________________________
"In every walk with nature one receives far more than he seeks."

John Muir ~ ~ ~ ~   ><))))( *>  About Me      

Link to comment
Share on other sites

I saw that pic and right away I noticed huge differences in the "grain" of the two specimens. Of course, fossilization can do funny things in different areas...I trust middevonian to point me in the right direction. He is a mountain of knowledge!

Link to comment
Share on other sites

Interesting find, would not mind seeing it in person when we meet up.

I'll be bringing a few samples of what we are looking for Friday just to wet your appetite .......

Link to comment
Share on other sites

Hi!
This is definitely a piece of fish, the cancellous bone is nice to see.
Why do you think, this a piece of a placoderm? For my opinion, it also could be a piece of a bony fish.

Cheers,

Nils

Link to comment
Share on other sites

The only reason I originally suspected placoderm is if you look at the original picture, before prep out, the exposed part looks remarkably like the shape of the fin.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...