Friday, August 29, 2014

Conularia from Bolivia

These are some Conulariids from Bolivia that I received as part of "grab bags" of fossils I purchased on E-bay. Nothing was labelled but based on pictures from this seller on E-bay, I have tentatively assigned ID's. All come from the Belen formation (Devonian, Emsian stage) and were found in an area south of La Paz.

Specimen #1 - Conularia brevis?



Specimen #2 - Conularia quichua? this is a 3-D specimen.



Specimen #3 - Paraconularia ulrichana (I found the label for these next two specimens)



Specimen #4



Wednesday, August 27, 2014

Parmorthis waldronensis brachiopod from the Waldron Shale

Another brachiopod from the diverse Waldron Shale (Silurian, Wenlock epoch) is Parmorthis waldronensis. It reminds me a little bit of Pseudoatrypa reticularis of the Devonian (because of one valve being convex and the other nearly flat) and Dalmanella multisecta of the Ordovician (because of the shape of the interarea). It also has a strong resemblance to Resserella elegantula specimens that I've found in the Irondequoit limestone near Lockport, NY.

Brachial valve
Anterior
Pedicle valve
Posterior
Profile

It turns out that a little research on the Fossilworks.org website (formerly Paleodb.org) shows that Parmorthis is a synonym of Resserella. So the resemblance is because they are one in the same. I will have to update the label to indicate Resserella waldronensis.

Monday, August 25, 2014

Schuchertella subplana from the Waldron Shale of Indiana

Schuchertella subplana is a relatively flat brachiopod but it is not a Strophomenid because both of it's valves are convex (rather than one being convex and the other concave). The specimen below comes from the Waldron Shale (Wenlock Epoch) in Bartholomew Co., IN.

Brachial valve
Anterior
Pedicle valve
Posterior
Profile


Saturday, August 23, 2014

Meristina maria brachiopod from the Waldron Shale

Since I mentioned the brachiopod genus Meristina in my last blog post I figured I should at least post an example of one. This is Meristina maria from the Waldron Shale of Shelby County, IN. It has a very deep sulcus and the pedicle valve is not as long as the brachial valve.

Brachial valve
Anterior
Pedicle valve
Posterior
Left profile
Right profile

I purchased this fossil from a dealer along with a number of other fossils from the Waldron shale. The Waldron shale is Silurian aged and dated to the Wenlock epoch.

Thursday, August 21, 2014

Merista tennesseensis brachiopod from Tennessee

Today I have a brachiopod specimen called Merista tennesseensis from the Silurian (Wenlock epoch) aged Bob Limestone member of the Brownsport Formation. It was found near Bath Springs, TN. I was confused when I saw the name at first because of the similarity to Meristella (let alone Meristina!) but it is a completely different genus.

Brachial valve
Anterior
Pedicle valve
Posterior
Profile

I found a couple of records on Yale's online collection of fossils in their Peabody Museum for Merista tennesseensis. This one was the only one that had a decent specimen picture.