Thursday, July 24, 2014

Meristella arcuata & Kozlowskiella raricesta brachiopods from the Onondoga formation

I found these two types of brachiopod on the floor of a old quarry near Syracuse, NY. They come from the Edgecliff member of the Onondoga formation (Devonian, Eifelian stage). They are fairly weathered but based on the paper "STRATIGRAPHY OF THE ONONDAGA LIMESTONE (DEVONIAN) IN CENTRAL NEW YORK By William A. Oliver, Jr (Bulletin of the Geological Society of America VOL. 66. PP. 621-662. JULY 1954)." I have some tentative ID's.

I think these are Meristella arcuata brachiopods Not enough detail for me to determine the pedicle vs. the brachial valve.

Specimen #1


Specimen #2






Then there is this Kozlowskiella raricesta valve (I think it's the pedicle valve)



Tuesday, July 22, 2014

Large Crinoid stems from the Onondoga Formation

This past May I visited an old quarry south of Syracuse, NY that exposed part of the Onondoga formation (middle Devonian, Eifelian stage). The floor of the quarry exposed part of a Biostrome (an area that surrounds a reef but is not the reef itself) that is contained within the Edgecliff member. One particular layer was chock full of large diameter, stoloniferous crinoid stems.

Specimen #1 (reassembled)




Specimen #2 (reassembled)




In places the stems seemed to be the substrate upon which everything else resided. For example, this Fistuliporid bryozoan....



.... and the base of fenestellid type bryozoan.

There is a paper called "STRATIGRAPHY OF THE ONONDAGA LIMESTONE (DEVONIAN) IN CENTRAL NEW YORK By William A. Oliver, Jr (Bulletin of the Geological Society of America VOL. 66. PP. 621-662. JULY 1954)" that has been helpful in identifying some of the fossils I found, but there is not much info for Bryozoans.

Sunday, July 20, 2014

Mucrospirifer thedfordensis brachiopod from the Widder Formation

I'm very late to be posting about Mucrospirifer thedfordensis which is one of the most common fossils found in the Widder formation at Arkona. It is similar to M. mucronatus but does not have as much ornamentation on the shell surface and is "plumper". The specimens below are still missing a part of the hinge line which would have extended out another centimeter or two beyond the shell on either side.

Brachial valve
Anterior
Pedicle valve
Posterior
Profile

This next specimen has a number of epibionts attached to it's surface. Brachial valve
Anterior
Pedicle valve
Posterior
Profile

Looks like we have some Spirorbis worm tubes....
... and Hederella bryozoans

The Widder formation is middle Devonian in age (Givetian stage) and roughly corresponds to the Ledyard mbr. of the Ludlowville formation in New York.

Friday, July 18, 2014

Three Cenozoic gastropods from France

These first two shells come from the Neogene (Miocene series) age sediments in the Gironde state of France (near Bordeaux). First is Cerithium margaritaceum


Next is Turritells terebralis

Then its Clavilithes noae from the Paleogene (Eocene series, Lutetian stage) which was collected near Paris, France.




Thanks to Gery for sending me these fossils!

Wednesday, July 16, 2014

Anastrophia internascens brachiopod from the Waldron Formation

When I see a brachiopod name with "strophia" in it I tend to think of shells with a convex dorsal valve like Strophodonta or Strophomena. Anastrophia, however, is a Pentemerid type brachiopod from the Silurian aged Waldron Formation near Pegram, TN (Silurian, Wenlock epoch, Sheinwoodian to Homerian stage).

Brachial valve
Anterior
Pedicle valve
Posterior
Profile

I'm glad I bought this specimen from  reputable dealer who had a good ID on it. Trying to figure out Rhynconellid ID's can be very tough.