Mahantango Formation Invert ID

[Vin 5]

Hello everyone,

These were all found in St. Claire, PA. Mahantango Formation. Anybody know what these are?

 

#1. Looks like octopus suckers in brown outline. Is it a coral?

#2. Crinoid star stems?

#3. Cylindrical molds, what are these?

 

[Vin 5]

#4. Looks like a brown burrow but segmented. Another crinoid?

#5. Looks like an iron filled brachiopod or clam?

#6. Some brachiopod?

 

[Vin 5]

#7. Starfish?

#8. Trilobite?

#9. Another trilobite?

#10. Segmented trace. Trilobite or something else?

[Huntonia 600]

51 minutes ago, Vin said:

 

These appear to be orthocone nautiloids.

[connorp 1,550]

I agree that #3 are orthoconic nautiloids. Maybe #4 as well, not entirely sure from the picture though. #6 is a nice looking spiriferid brachiopod, maybe @Tidgy's Dad will have an idea on the species.

[Tidgy's Dad 15,169]

Mucrospirifer. 

Probably Mucrospirifer mucronatus. 

[Vin 5]

Thanks guys!

[FossilizedJello 36]

I do believe they are trilobite sections from the body. Looking forward to seeing if anything else gets IDed

[EMP 251]

@Vin

 

1 - Looks like some kind of invertebrate burrow, looking at it top down. A closer picture might make a difference though. The "corals" may be bryozoans. 

 

2 - Looks to be a crinoid stem

 

3 - Mold of a straight shelled nautiloid is my guess

 

4 - Infilled burrow I believe

 

5 - I think that's mineral staining

 

6 - Mucrospirifer mucronatus

 

7 - That's actually the tips of a brachiopod sticking out from the shale. Imagine looking at a sea shell head on (from the side)

 

8 - Looks like part of a Dipleura dekayi thorax. Cool find!

 

9 - Same as above

 

10 - Too big for a Tentaculites sp., at least from what I've seen in the Mahantango. Maybe another straight shelled nautiloid, Michelinoceras sp.? 

[Vin 5]

On 8/6/2020 at 11:21 PM, EMP said:

@Vin

 

1 - Looks like some kind of invertebrate burrow, looking at it top down. A closer picture might make a difference though. The "corals" may be bryozoans. 

 

2 - Looks to be a crinoid stem

 

3 - Mold of a straight shelled nautiloid is my guess

 

4 - Infilled burrow I believe

 

5 - I think that's mineral staining

 

6 - Mucrospirifer mucronatus

 

7 - That's actually the tips of a brachiopod sticking out from the shale. Imagine looking at a sea shell head on (from the side)

 

8 - Looks like part of a Dipleura dekayi thorax. Cool find!

 

9 - Same as above

 

10 - Too big for a Tentaculites sp., at least from what I've seen in the Mahantango. Maybe another straight shelled nautiloid, Michelinoceras sp.? 

 

Thanks a lot for the Identification, the trilobites made me really happy!

Cheers