Tuesday, September 2, 2014

Platyceras bistrami gastropod from Bolivia

This is a gastropod fossil called Platyceras bistrami from the Belen formation (Devonian, Emsian stage) of Bolivia. It seems to be distinguished from other species by the undulating surface of it's shell. This is just a cast of the shell but the ripples are preserved well. Also, P. bistrami (when I write it that way it makes me think of Pastrami) has a tighter coil to it's shell than other species.





This specimen was found south of La Paz, Bolivia and I purchased it off of E-bay.

Sunday, August 31, 2014

Metacryphaeus sp. trilobite from Bolivia

I posted in an earlier blog entry about some Trilobite fossils I had from Bolivia. At the time I could not tell what the genera was of them because there were no labels. Well I found the specimen below in a box with some older E-bay purchases and it has a label calling it Metacryphaeus sp. (which makes my job that much eaiser!). It is preserved in a neat pose that looks like it was buried in the mud, with just it's head exposed, while it awaited prey.








This specimens come from the Belen formation (Devonian, Eifelian stage) south of the capitol of Bolivia, La Paz.

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