Streptelasma (Enterolasma) strictum ? coral from the Bois D'Arc formation of Oklahoma.

I can't find very much info on the corals that are found within the Bois D'Arc formation so I have been comparing what I found with similar examples from the Kalkberg formation of New York which is of equivalent age. I found numerous examples of a small, conical rugose coral that had prominent raised lines running along the flanks.  It looks very similar to Streptelasma (Enterolasma) strictum from the Kalkberg formation.

Specimen #1

Specimen #2

I found the specimens shown on this page in the Bois d'Arc formation (Cravatt member) near Clarita, OK which is Devonian in age (Lockhovian stage). The Bois d'Arc and Haragan formations interfinger with each other and are roughly the same age (Devonian, Lockhovian stage). They are both roughly correlative to the Helderberg fauna of New York and thus are contemporaneous with the Coyemans, Kalkberg and New Scotland formations.

Lichenalia sp. bryozoans from the Bois D'Arc formation of Oklahoma

Among the more easily identified bryozoan fossils that I found in the Bois D'Arc formation are these Lichenalia sp. examples. It's a small, encrusting fossil that I often found as loose discs. They likely started their colonies on a solid surface and could have used a crinoid segment or ostracod molt as a base. None of the examples that I found have the underside clean enough of matrix for me to tell. for sure. The fossils resemble a net with lots of small openings side by side with each other with little to no room between polyps. They appear to grow from a central point and likely budded off new growth as it expanded outward. Each colony would be clones of the first individual polyp to settle the substrate.

The specimens below could represent multiple species. I'm not enough of an expert to discern the differences.


Specimen #1

Specimen #2 (with crinoid holdfast)

Specimen #3

Specimen #4

These specimens look very similar to some I have found in the Kalkberg formation of New York but I labelled those as possibly being Paleschara or Leioclesma.

From the Givetian stage of the Devonian I have some examples of Lichenalia from the Wanakah Shale of New York, and the Hungry Hollow member of the Widder Formation in Ontario.

I found the specimens shown on this page in the Bois d'Arc formation (Cravatt member) near Clarita, OK which is Devonian in age (Lockhovian stage). The Bois d'Arc and Haragan formations interfinger with each other and are roughly the same age (Devonian, Lockhovian stage). They are both roughly correlative to the Helderberg fauna of New York and thus are contemporaneous with the Coyemans, Kalkberg and New Scotland formations.

Levenea subcarinata pumilis brachiopod from the Bois d'Arc formation of Oklahoma

One of the more common brachiopods that I found in the Bois d'Arc formation is Levenea subcarinata pumilis. It is similar to Rhipimelloides oblata except for a few key features. The hinge line is wide and straight and the presence of a wide, shallow fold/sulcus structure. Otherwise they share some similar traits like the rounded shape to the shell and the  pedicle valve extending slightly past the brachial valve. Another difference are the fine costae on the valve surfaces which on L. subcarinata pumilis are more curved instead of straight. the margin between the valves is flat except for where it bends to follow the fold/sulcus.

Specimen #1 - Brachial valve

Anterior

Pedicle valve

Posterior

Profile

Specimen #2 - Brachial valve

Anterior

Pedicle valve

Posterior

Profile

The specimens I found in the Bois d'Arc formation are larger than those that I have from the Haragan formation. This is also noted by Amsden and he attributed this to clearer waters with less sediment in the Bois d'Arc.

I found the specimen shown on this page in the Bois d'Arc formation (Cravatt member) near Clarita, OK which is Devonian in age (Lockhovian stage). The Bois d'Arc and Haragan formations interfinger with each other and are roughly the same age (Devonian, Lockhovian stage). They are both roughly correlative to the Helderberg fauna of New York and thus are contemporaneous with the Coyemans, Kalkberg and New Scotland formations.

References:
"Stratigraphy and Paleontology of the Hunton Group in the Arbuckle Mountain Region, Part V - Bois d'Arc Articulate Brachiopods " Amsden, 1958, Oklahoma Geological Survey Bulletin 82

Unknown Rhynchonellid brachiopod from the Bois d'Arc formation of Oklahoma

This next brachiopod is a bit of a mystery to me. I can not find any decriptions or images that match it in Amsden's "Stratigraphy and Paleontology of the Hunton Group" papers nor in Hall's "Paleontology of New York". It is a triangular to sub-pentagonal shaped shell with slightly convex to flat valves. There is a slight sulcus and fold but they are mostly expressed near the anterior margin. The pedicle valve's beak extends beyond the brachial valve and recurves so that the umbo opening is parallel with the valve. Both vales have strong, regular costae that affect the margin such that it follows the folds of the costae instead of being flat.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

This fossil looks as though it could be a Rhynchotreta type brachiopod. I found a Rhynchotreta in the Irodequoit Rochester Shale formation near Lockport, NY but that is Silurian in age. But the shell morphology is similar.

I found the specimen shown on this page in the Bois d'Arc formation (Cravatt member) near Clarita, OK which is Devonian in age (Lockhovian stage). The Bois d'Arc and Haragan formations interfinger with each other and are roughly the same age (Devonian, Lockhovian stage). They are both roughly correlative to the Helderberg fauna of New York and thus are contemporaneous with the Coyemans, Kalkberg and New Scotland formations.

Nucelospira ventricosta from the Bois d'Arc formation of Oklahoma

This little, rounded shell appears to be a Nucleospira based on the shape.  I found it in the Bois d'Arc formation in Oklahoma. The brachial valve is slightly smaller and less convex than the pedicle valve but both are nearly perfectly circular. My fossil is smooth on the surface of the valve, at least in the areas where there is still shell, but it should be covered with lots of tiny, needle like spines. They likely either did not preserve well or were weathered away. There is a small beak on the pedicle valve which extends slightly past and curves towards the brachial valve. The umbo at the peak is perpendicular to the rest of the shell. There is no obvious fold or sulcus present.

There is a Nucleospira ventricosa listed as being found in the Bois d'Arc and Haragan Fm.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

Compare this specimen to one from the Kalkberg formation of New York.

I found the specimen shown on this page in the Bois d'Arc formation (Cravatt member) near Clarita, OK which is Devonian in age (Lockhovian stage). The Bois d'Arc and Haragan formations interfinger with each other and are roughly the same age (Devonian, Lockhovian stage). They are both roughly correlative to the Helderberg fauna of New York and thus are contemporaneous with the Coyemans, Kalkberg and New Scotland formations.

References:
"Stratigraphy and Paleontology of the Hunton Group in the Arbuckle Mountain Region, Part V - Bois d'Arc Articulate Brachiopods " Amsden, 1958, Oklahoma Geological Survey Bulletin 82