Trigonarca matheroniana Fossil

Trigonarca matheroniana (d'Orbigny, 1844) is a pelecypod fossil. This genus might be known as Arca (Linnaeus, 1758). It existed during the Cretaceous Period (about 120-70 million years ago ). This fossil was found in Uchaux, France. Fossil was on display at Natural History Museum Vienna (Naturhistorisches Museum Wien) (August 2024).

Pterotrigonia vaelsiensis Fossil

Pterotrigonia vaelsiensis (Boehm, 1884) is a pelecypod fossil. It existed during the Cretaceous Period (about 120-70 million years ago ). This fossil was found in Uchaux, France. Fossil was on display at Natural History Museum Vienna (Naturhistorisches Museum Wien) (August 2024).

Pterotrigonia thoracica Fossil

Pterotrigonia thoracica (Morton 1834) pelecypod is the official state fossil of Tennessee. It existed during the Cretaceous Period (about 70 million years ago - Maastrichtian). This fossil was found in Coon Creek, Tennessee USA. Fossil was on display at Natural History Museum Vienna (Naturhistorisches Museum Wien) (August 2024).

Shell Fossils at Florence Italy Mineral Museum

Here are some pictures from a mineral museum of calcite specimen found in the state of Florida of the United States. Fossils are probably the Giant Venus Clam fossil (aka Mercenaria permagna) of the Fort Drum Member, Nashua Formation of Ruck's Pit in Okeechobee County, Florida, USA. This animal lived in the Calabrian Stage (780,000 years ago to 1.8 million years ago) of the Pleistocene Epoch of the Quaternary Period.

Specimen was on display at the la Specola Museo Di Zoologia Ceropastica e Mineralogia (Florence, Italy) (August 2024).

Paraconularia with Cypricardinia Pelecypod Fossils

 

Paraconularia (Sinclair, 1940) with Cypricardinia (Hall, 1860) pelecypod fossils shown in the pictures. Fossils were found in Floyd County Indiana USA. The fossils date to the Mississippian Period. Thanks to Kenny for images.

Modiolopsis Pelecypod Fossil

This brachiopod fossil appears to be a Modiolopsis (Hall, 1847) from the Ordovician Period. It was found in the Logana Member of the Lexington Limestone for Franklin County, Kentucky, USA. Thanks to Kenny for the picture.

Modiolodon Pelecypod Fossil

This pelecypod fossil appears to be a Modiolodon (Ulrich, 1894) from the Ordovician Period. It was found in the Logana Member of the Lexington Limestone for Franklin County, Kentucky, USA. Thanks to Kenny for the picture.

Anadara transversa Sea Shell

This shell appears to be a Transverse Ark shell or Anadara transversa (Say, 1822). It was found by a 17 year old Lucien Pearson Beckner in 1889 at Naples, Florida, USA. Mr. Beckner was a mentor to Professor James Conkin (1924-2017) and his natural history collection was left to him upon his death.

 

Chione elevata Shell

 

This shell appears to be a Florida Cross-barred Venus shell or Chione elevata (Say, 1822). It was found by a 17 year old Lucien Pearson Beckner in 1889 at Naples, Florida, USA. Mr. Beckner was a mentor to Professor James Conkin (1924-2017) and his natural history collection was left to him upon his death.

 

Modiomorpha concentrica Pelecypod Fossil

Here is another Louisville area fossil on display in the Deep Time Exhibit. It is a Modiomorpha concentrica (Conrad, 1838) which is an extinct clam. It was found in Silver Creek Formation of Clark County Indiana USA. It dates to the Middle Devonian Period.

The picture was taken in June 2023 on the first floor of the Smithsonian Museum of Natural History in Washington D.C. USA.

Learn more about this at Smithsonian Department of Paleobiology Collections USNM PAL36267:

http://n2t.net/ark:/65665/3144474e8-1fcc-4ffe-8535-3b86911109aa

Caritodens demissa Pelecypod Fossil

 

The Caritodens demissa (Conrad, 1842) pelecypod fossil found in Jefferson County, Indiana USA (near Madison). Fossil dates to the Ordovician Period. The book Index Fossils of North America by Hervey W. Shimer and Robert R. Shrock 1944 lists this fossil as Pterinea demissa (Conrad, 1842) of the Upper Ordovician Period (Maysville-Richmond). It is described as "Distinguished by its strong concentric growth lines and large anterior ear." The genus Pterina was named by Georg August Goldfuss (1782-1848) in 1832. Original species named Avicula demissa in 1842 by Timothy Abbott Conrad (1803-1877) in the Journal of Academy of Natural Sciences in Philadelphia Volume VIII page 242, plate XIII, figure 3.

Thanks to Kenny for the image.

Amnigenia catkillensis Pelecypod Fossils

 

This post documents a scan of large insert found in New York State Museum Bulletin 49 published December 1901. The paper is listed as Value of Amnigenia as an Indicator of Fresh-Water Deposits of New York, Ireland, and the Rhineland by John M. Clarke (pages 199-203; plate 11).

These pelecypods are listed as Amnigenia catkillensis (Hall, 1885) which were originally described by Vanuxem in 1842 as Cypricardites catskillensis. Researchgate web site lists genus renamed by Weir in 1969 to Archanodon. Fossils date to the Devonian Period.

Image is from plate 11 described as "a slab of limestone bearing 33 individuals of this species all with closed valves and buried in the mud at various angles across the lines of sedimentation." It was found in the Oneonta sandstone of Clarke Quarry at Oxford, New York, USA. The specimen was presented to the New York State Museum by E.E. Davis, esq. of Norwich, New York. The plate is sized at approximately 14 by 10 inches (35.5 x 25.4 cm)

Leptodesma marcellense Pelecypod Fossil

 

Here are a series of images drawn by Elvira Wood in 1901 which she used to show fossil pelecypod called Leptodesma marcellense (Hall). She described and illustrated it in the 1901 paper Marcellus (Stafford) Limestones of Lancaster, Erie Co. N.Y. on pages 190. Illustrations on plate 9 figures 16 and 17.

A Clam Fossil and Its Friends

 

Pictured above is a hash plate from the Calloway Creek Formation of Spencer County Kentucky USA. The main fossil is a mostly intact Caritodens demissa (Conrad, 1842) clam fossil with some interesting fossils on or around it. Below is unidentified 4mm diameter bryozoan fossil on the clam fossil.

Near the bryozoan on the shell is the 1.5 mm cephalon of unidentified trilobite fossil seen below.

Near by is the spine of an unidentified trilobite fossil measuring about 4 mm.

Off to the side of the shell is the pygidium of probably a Flexicalymene trilobite fossil about 5mm in size.

Thanks to Kenny for the pictures of his recent fossil find.

Pelecypod fossil originally described by Timothy Abbott Conrad in 1842 as Avicula demissa in "Observations of the Silurian and Devonian systems of the U.S., with descriptions of new organic remains" Journal of the Academy of Natural Sciences of Philadelphia, v. 8, no. 2, p. 228-235.

Plate XIII figure 3

Find on Internet here:

https://www.biodiversitylibrary.org/item/79280#page/260/mode/1up

Cypricardina scitula Pelecypod Fossil

 

These are pictures of a clam fossil called Cypricardina scitula (Herrick). It existed in the Mississippian Period. The fossil was found in Carwood Formation of Washington County, Indiana USA. Thanks to Kenny for the pictures and nice find!

Cypricardinia arata Pelecypod Fossil

This image is of several very nice Cypricardinia arata clam fossils. They were found in the Waldron Shale of Clark County, Indiana USA. The fossils date to the Silurian Period (Wenlock Epoch, Sheinwoodian to Homerian Stage).

Thanks to Kenny for the image.

Inoceramus pictus Bivalve Fossil

This image is of an Inoceramus pictus (Sowerby) pelecypod fossil. It was found in St. Parres (Yonne), France. The fossil dates to the Late Creteous Period (Cenomanian). It was displayed at Muséum National D'Historie Naturelle Jardin Des Plantes Paléontologie et Anatomie Comparée, Paris, France.  Image taken August 2016.

Pecten jacobaeus Great Scallop Fossil

These images are of the Pecten jacobaeus pelecypod fossil. The animal existed in the Pliocene Epoch (4-3 million years ago) of Neogene Period. Fossils were discovered in Capasanta Isola di Planosa Livorno Italy.

Picture taken at Orciano Pisano Whale Exhibit in Museo di Geologia e Paleontologia Florence Italy (Università degli Studi di Firenze) in August 2019.

Pecten Scallop + Coral Fossil

I am not sure where or what time period this fossil is from. It appears to be a Pecten pelecypod fossil with small coral colony attached.  Looking at the indentation in the shell it may have had more colonies attached at one time.

It was part of the James Conkin collection.

Cast of Large Ambonychia Clam Fossil with Bryozoan

This fossil mold appears to be an Ambonychia clam with both valves and is big enough to almost cover the palm of a hand. The clam fossil may have several colonies of cyclostome bryozoan (though only their holdfasts remain). I don't see where the zooids would bud out of their protective structures.The branching pattern seen in the pictures can be found on quite a few clam molds at the site this fossil was collected.
On both sides there are remnants of another bryzoan in what seems to be Prasapora simulatrix.

It looks like the shell eroded away and the bryozoan set up shop on the mold but on both sides. Not sure how this was accomplished at the same time which leads me to believe they grew on one side till the fossil was turned over and then new colonies grew on this water exposed side. Just a theory...

This fossil was found in Bullitt County, Kentucky, USA. It might be from the Grant Lake Formation. The fossil dates to the Ordovician Period.