Trip to Deer Lake - Orwigsberg, PA - Mahantango Formation (Middle-Devonian)

[Masonk]

Hi All,

I took a trip a couple weeks ago (6/19) out to Orwigsburg, PA to Deer Lake to hunt for Middle-Devonian fossils.

 

Interesting location as the exposed formation (Mahantango) is situated in the parking lot of a local restaurant. 

 

It was a hot one, but I managed to find some shade under a few small evergreens.

 

Spent a few hours at the site and did fairly well overall. Found one Trilobite and a section of Cephalopod. 

 

Plenty of Crinoids, Brachiopod, Gastropod Steinkerns, Bryozoan and Bivalves.

 

[Masonk]

Trilobite (cephalon and part of thorax of Eldredgeops rana?) and section of Cephalopod (Bactrite?)

 

 

 

 

[Masonk]

Several Gastropod

 

 

 

 

 

[Masonk]

Brachiopods - I believe all are Mucrospirifer sp. 

 

 

 

 

[Masonk]

Orthonata undulata 

 

 

 

Not sure what the center impression would be, if anything. Brachiopod?

 

 

 

Brachiopod bottom right

 

Bryozoan bottom right  (Cystoporida?)

 

 

 

Edited Monday at 08:04 PM by Masonk

[Masonk]

I believe these are all also bivalves, although top right could be a brachiopod?

 

 

Pleurodictyum sp. (bottom left)

 

Palaeoneilo sp.?

 

Palaeoneilo sp.?

[Masonk]

More Brachiopods!

 

 

 

Devonchonetes sp.?

 

Devonchonetes sp.?

 

 

 

 

[Masonk]

 

Goniophora hamiltonensis?

 

Bryozoan with a brachiopod or bivalve steinkern?, Crinoid at bottom. 

 

[Masonk]

 

 

Tentaculites bellulus?

 

This is conical shaped and has ridges. Assuming a straight shell cephalopod or gastropod?, Crinoid and Brachiopod bottom right. 

 

Crinoid stem

 

Crinoid stem

 

Crinoid

 

Crenistriella sp.?

 

Edited Monday at 07:41 PM by Masonk

[Masonk]

 

Bryozoan

 

Crinoids

 

Bryozoan, Crinoid, Brachiopod 

[Masonk]

And the final group

 

 

Mostly Crinoids

 

 

 

Brachiopod and Crinoid

 

Brachiopod and a small Gastropod. 

 

Brachiopod and Bryozoan

 

[Masonk]

Thanks for looking! Please feel free to correct any of my IDs. I'm still learning and won't take offense. 

[Fossildude19]

42 minutes ago, Masonk said:

Bryozoan

Bryozoan, Crinoid, Brachiopod 

 

 

The "bryozoans" here all appear to be thoracic segments of Dipleura dekayi.

[Masonk]

8 minutes ago, Fossildude19 said:

 

 

The "bryozoans" here all appear to be thoracic segments of Dipleura dekayi.

 

Thanks, Tim! I've never seen one up close and wasn't aware they had such a pronounced texture.

 

Pretty cool! Gives me hope I may one day find a complete example.