Bryozoan+Starfish?

[Mochaccino]

Hello,

 

This is another old collection piece without provenance, and I was hoping someone could tell me if they recognize anything or guess its age. It's a plate of bryozoans, but I think I see a couple starfish peeking out from underneath.

 

[rocket]

the starfishes are great, I think it is possible to prep them (KOH or airbrasive)

reminds me to Thamnopora from the Martin Formation of Verde Valley, Arizona

Have seen a slab with starfishes from there some years ago

 

Edited February 6 by rocket

[Yoda]

That is a really nice hash plate. 

[Isotelus2883]

Bromide formation Echinoderm layer?

[Darktooth]

It is a very interesting piece. Has alot going on.

[connorp]

Certainly looks similar to lots of Cincinnatian rocks. I suspect cleaning up the brachiopods would be the best route to ID.

[Isotelus2883]

I have a piece with similar bryozoans from the Mtn. Lake Mbr of the Bromide Fm. Apologies for the blurry photo.

[Mochaccino]

On 2/6/2024 at 2:25 AM, rocket said:

the starfishes are great, I think it is possible to prep them (KOH or airbrasive)

reminds me to Thamnopora from the Martin Formation of Verde Valley, Arizona

Have seen a slab with starfishes from there some years ago

 

 

On 2/6/2024 at 5:41 AM, Isotelus2883 said:

Bromide formation Echinoderm layer?

 

On 2/6/2024 at 7:58 AM, connorp said:

Certainly looks similar to lots of Cincinnatian rocks. I suspect cleaning up the brachiopods would be the best route to ID.

 

18 hours ago, Isotelus2883 said:

I have a piece with similar bryozoans from the Mtn. Lake Mbr of the Bromide Fm. Apologies for the blurry photo.

Thanks everyone! Looks like a few possible candidate localities it could be. The starfish seem worth cleaning out so I'll reassess after some prep.

[rocket]

cannot wait to see the starfishes, quality looks fantastic!!!

[FossilDAWG]

I think the twigg-like fossils are bryozoans, not Thamnopora corals.   Certainly the Martin Formation Thamnopora have larger corallites relative to the size of the "twigs", and have a rougher appearance.  Also for what it's worth I have never heard or seen any publications mentioning articulated echinoderm material, much less starfish, in the Martin.  All my Martin material was in dolomite limestone, and the fossils were all silified and had to be prepped with acid. @DPS Ammonite may be able to comment as he is very familiar with the Martin and the Verde Valley.

 

Don

[DPS Ammonite]

24 minutes ago, FossilDAWG said:

I think the twigg-like fossils are bryozoans, not Thamnopora corals.   Certainly the Martin Formation Thamnopora have larger corallites relative to the size of the "twigs", and have a rougher appearance.  Also for what it's worth I have never heard or seen any publications mentioning articulated echinoderm material, much less starfish, in the Martin.  All my Martin material was in dolomite limestone, and the fossils were all silified and had to be prepped with acid. @DPS Ammonite may be able to comment as he is very familiar with the Martin and the Verde Valley.

 

Don

I agree with Don; not Thamnopora from the Martin Formation. Would love to see purported starfish from the Martin.

 

See Thamnopora from Chasm Creek in the Verde Valley, Arizona.

Edited February 8 by DPS Ammonite