#USA bivalve fossil

[uk-fossils]

Crepidula Fossil Bivalve – Lower Miocene, Clallam Formation, Washington USA, Genuine Specimen

A genuine and well-preserved Crepidula fossil bivalve from the Lower Miocene epoch, approximately 16–20 million years old. This fossil was discovered in the Clallam Formation of Northwestern Washington, USA, an important geological unit known for preserving a diverse assemblage of marine molluscs.

The genus Crepidula, commonly known as slipper shells, is a marine gastropod mollusc (often mistaken for a bivalve due to its shell shape) with a distinctive internal shelf structure. This specimen reflects the shallow marine environments of the early Miocene in the Pacific Northwest.

Fossil Type: Gastropod (commonly called a slipper shell, not a true bivalve)

Genus: Crepidula

Geological Age: Lower Miocene (approx. 16–20 million years ago)

Formation: Clallam Formation

Depositional Environment: The Clallam Formation was deposited in a shallow, warm marine setting with good water circulation, supporting abundant marine life. The sediments include sandstone and siltstone beds that preserved mollusc shells in fine detail.

Morphological Features:

Convex outer shell with a smooth to slightly ridged surface

Internal “shelf” typical of Crepidula species visible in some specimens

Preservation may include original shell material or internal moulds

Notable:

Authentic specimen from the Clallam Formation, Washington State

A well-known genus with evolutionary and ecological interest

Ideal for fossil collectors, educators, and marine paleontology enthusiasts

Actual item shown – photo depicts the exact specimen you will receive

Authenticity: All of our fossils are 100% genuine natural specimens and come with a Certificate of Authenticity. The photo includes a 1cm scale cube for reference – please view the image for accurate sizing.

Add this genuine Crepidula fossil to your collection – a classic marine mollusc from the Lower Miocene seas of the Pacific Northwest, showcasing a beautifully preserved snapshot of ancient ocean life.

[ardentguilt]

Globidens Mososaur Tooth

The fossilised tooth of a Mososaur of the Globidens genus.

Mososaur from this genus had large, rounded teeth that were comparatively shorter than other types of Mososaur.

Globidens Mososaurs teeth were specialised for dealing with armoured prey, allowing them to crust the tough shells of prey such as turtles, ammonites, nautili and bivalves.

Globidens Mososaurs were of a relatively medium size as far as Mososaur go reaching around 5-6 metres in length.

They existed during the late Cretaceous period approximately 84.9 to 66 million years ago.

This tooth here was recovered from Morocco though fossils of this species have also been found in Angola, Brazil, Columbia, Syria and the USA.

[dragonmagick]

Feels like a perfect dragon treasure.

CALCITE IN FOSSIL BIVALVE

ID: CC11703

Gemmy light amber intergrown steeply pyramidal crystals of Calcite measuring to around 1.2cm line part of creamy white fossil Bivalve from Florida, USA.

https://www.crystalclassics.co.uk/product/cc11703/

[alphynix]

Thylacocephalans were a bizarre group of extinct marine arthropods that often looked like tiny alien creatures – and whose evolutionary relationships are still uncertain. Despite existing in oceans around the world for at least 350 million years, their fossil record is rather spotty and their internal anatomy is often poorly preserved, making it difficult to figure out anything more specific than "probably some sort of crustacean".

Possible thylacocephalans are known from as far back as the Cambrian, but one of the earliest definite members of the group was Thylacares brandonensis.

Living during the early Silurian, around 436 million years ago, in the region that today is part of Wisconsin, USA (found in the same fossil formation as last week's Venustulus), this species measured up to about 7.5cm long (3"). Its body was enclosed by a large bivalved carapace, with protruding stalked eyes and what may have been a pair of antennae, along with smaller raptorial limbs than its later relatives.

While it was less specialized than other thylacocephalans it was probably a similar sort of swimming predator, catching prey with its spiny limbs.

———

Nix Illustration | Tumblr | Pillowfort | Twitter | Patreon

[phenomenalgems]

🐚💕 This cluster of fossilized calcite-replaced bivalve shells is a classic Floridian specimen! The cluster combines white shells with a clamshell that has been totally replaced by golden yellow calcite—a unique feature that sets this piece apart. As seen under UV, the calcite shell glows with amazing greenish-yellow brightness! Appealing and unusual, and a must for any fossil collection. 🐚 $78 shipped US—dm for details or comment to claim. 🌌 Keep an eye out for tons of new specimens in this week’s shop update, leading up to my biggest sale of the year! Visit PhenomenalGems.Etsy.com for details. 😍 #fossils #clamshell #fluorescent #uv #blacklight #ruckspit #fortdrum #okeechobee #florida #usa #floridabeaches #rocksandminerals #mineralspecimens #crystals #naturelovers #sciencelovers #motherearth #bigsale #phenomenalgems #rockshop #etsy #etsyshop #etsycrystals

[geotourism]

Triassic Beds of Lake Lugano and Ticino In Switzerland

Lake Lugano Switzerland

Lake Lugano is a glacial lake in southern Switzerland and borders Italy. It is situated between the Alps and the Lepontine Alps in the canton of Ticino. The lake and surrounding area are popular tourist destinations, with many villas situated around the shores. The average water temperature at Lake Lugano is 10 degrees Celsius in the summer and 2 degrees Celsius in the winter. It has a surface area of 48.7 km² and a maximum depth of 288 m. The lake is fed by the River Ticino and has a drainage basin of 9,000 km². The main towns on the shores of the lake are Bellinzona, Lugano, Mendrisio, and Locarno. The lake is popular for its recreational activities such as boating, fishing, swimming, and windsurfing.

Popular Attractions on the Lake

Lake Lugano is a popular tourist destination in Switzerland. The lake is surrounded by mountains, making it a picturesque location. There are many popular attractions on the lake, including the Villa Diodati, the Botanical Garden, and the Villa Silvia. Lugano Mountain is the highest peak in the canton of Ticino and the highest point in Switzerland. The mountain is part of the Pennine Alps and is located in the municipality of Lugano. It has an elevation of 2,997 meters. Lake Lugano is known for its amazing views, and there are many top attractions located around the lake. Some of the top attractions include the Villa d’Este, the Villa Monastero, the Castelgrande, and the Botanical Garden.

Geology of the Area

The lake is 48.7 km2  in size, 63% of which is in Switzerland and 37% in Italy. It has a maximum width of about 3 km at the bay of Lugano. A maximum depth of 288 m is found in the northern basin.  The pyramid-shaped, wooded mountain of Monte San Giorgio is located beside Lake Lugano and is regarded as the best fossil record of marine life from the Triassic Period (nearly 245 million years ago). Diverse marine life flourished within this lagoon, including reptiles, fish, bivalves, ammonites, echinoderms, and crustaceans. The area comprises Triassic carbonate formations, mostly within the protected area, which outcrops between both older volcanic and more recent sedimentary formations of the Southern Alpine Series in the buffer zone.

Permian andesites and rhyolites of volcanic origin are exposed on the north face of lake Lugano. Jurassic limestone formations occur on the lower slopes which dip at the mountain foot under the sediments of the Po valley. The Middle Triassic sequence occurs in beds of limestone more than 1,000 m thick. The Triassic sequence includes conglomerate and sandstone (Bellano formation), reef limestone, dolomites and bituminous shales (Besano formation – the main fossil-bearing horizons), marls, limestones and gypsum (Pizzella marls), marine dolomites and dolomitized oolitic limestone (Tremona beds).

Activities on and around the Lake

Lake Lugano is a great destination for a lake vacation. It is surrounded by mountains, making for beautiful scenery. There are many popular Spots located around the lake, making it a great place to enjoy some recreation. Some of the most popular include swimming, boating, fishing, and hiking. A day trip to Lugano is a great way to enjoy the sights and sounds of the city without having to stay there overnight.

Also read- The Great Plains USA: History, Facts, Map And Geology

Morcote village

Morcote is a popular village located on the shores of Lake Lugano. There are many restaurants and shops located in the village. Morcote is also home to Morcote Castle, which is a popular tourist attraction. Apart from this Lugano villages include, Bellinzona, Cossonico, and Sarnico.

Lake Ticino, Switzerland

Lake Ticino is a large lake in the Swiss Alps and it is also the second deepest lake in Switzerland. The lake is popular for boating, swimming, fishing, and hiking. There are many places located around the lake, including the Finsteraarhorn, the Jungfrau Region, and the Seelisberg. It is surrounded by some of the most popular tourist attractions in the country. There are plenty of activities to enjoy on and around the lake, including swimming, hiking, boating, and skiing. The weather and temperature can vary depending on the time of year, so be sure to check the forecast before your visit.

[reseau-actu]

Un étudiant universitaire a trouvé des traces d’un impact météoritique à l’intérieur d’anciennes palourdes fossilisées. Lorsqu’un grain de sable pénètre dans la coquille d’un mollusque, cela l’irrite. Il entoure alors le grain avec de la nacre, pour se protéger. Plusieurs couches de nacre se déposent ensuite, jusqu’à former une perle. Ici, ce n’est pas ce qu’il s’est produit : les billes conservées dans les mollusques seraient directement issues d’un ancien impact de météorite. Mais il s’agit tout de même de perles plus que rares, contenant des informations historiques précieuses.

Alors qu’il ramassait des palourdes fossilisées de l’espèce Mercenaria campechiensis dans une carrière du comté de Sarasota (Floride) en 2006, Mike Meyer, alors étudiant de premier cycle à l’Université de Floride du Sud, ne s’attendait pas à découvrir les traces d’un astéroïde lorsqu’il entama son étude. Certains bivalves (la classe de mollusques en question) se trouvant sur son site de recherche datent de plusieurs millions d’années, et les sédiments piégés dans ces derniers après leur mort fournissent un enregistrement des conditions de l’époque, et donc de l’histoire géologique de la Floride.

La matière contenue dans ce type de fossiles, à laquelle Meyer s’attendait encore une fois, est généralement composée de foraminifères, des organismes unicellulaires dont l’espèce dominante change en fonction des conditions climatiques. Mais un jour, il remarqua la présence de minuscules billes de verre translucides. Elles étaient presque sphériques, excluant la possibilité que ce soit des grains de sable. Ses responsables de projet d’étude et lui-même n’ont pas réussi à identifier les objets, nécessitant un approfondissement. Il a donc conservé 83 billes, qu’il a placées dans une collection privée.

Les billes découvertes par l’équipe sont presque sphériques vues à l’oeil nu, mais sous un fort grossissement, on peut distinguer des irrégularités (bosses et creux). Crédits : Mike Meyer

« Ce n’est qu’il y a quelques années que j’ai eu du temps libre pour me consacrer à nouveau à cette étude », a déclaré Meyer dans un communiqué, maintenant titulaire d’un doctorat et travaillant à l’université de Harrisburg. « Je me suis donc dit, laissez-moi juste repartir de zéro et me remettre au travail ».

Emplacement du site et information stratigraphique. A) Image satellite de la zone de collecte. L’encadré montre l’emplacement dans le comté de Sarasota, en Floride (USA), avec la zone spécifique, la carrière, et le site (étoile) mis en évidence. B) Stratigraphie du site de prélèvement de l’échantillon. L’encart présente un spécimen de Mercenaria campechiensis, montrant les sédiments intérieurs à partir desquels les microsphères de cette étude ont été trouvées. C) Une vue de la carrière, avec des “lits de coquilles” ; les coquilles abondantes de bivalves et de gastéropodes sont visibles. Crédits : Mike Meyer, Peter J. Harries et Roger W. Portell

Après avoir comparé les billes à toutes sortes d’objets géologiques qu’il connaissait, Meyer a conclu qu’il s’agissait de microtectites (une tectite étant un fragment de roche fondue et expulsée en dehors du cratère d’impact d’une météorite), de minuscules fragments de verre projetés lorsqu’un objet substantiel s’enfouit dans la Terre. Les résultats de son étude ont été publiés dans Meteoritics and Planetary Science.

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Vous allez aussi aimer : Un mystérieux verre jaune se trouvant dans le désert égyptien serait le résultat de l’impact d’une météorite !

Lors d’une collision importante, les micro-protéines contenues dans un organisme peuvent s’éloigner les unes des autres de manière significative. Lorsque cela se produit, il y a une combustion du sodium. Les concentrations élevées de sodium découvertes par Meyer suggèrent donc un impact météoritique local.

Les microsphères vues au microscope électronique à balayage (MEB). Chaque bille fait en moyenne 0.2mm de diamètre. Barres d’échelle : A-B = 50 μm, C = 1 mm, D-G = 50 μm. Crédits : Mike Meyer, Peter J. Harries et Roger W. Portell

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Les microtectites conservées dans les palourdes semblent dater de 2 à 3 millions d’années, mais une datation plus précise est prévue. Aucune autre preuve d’un impact de météorite n’a été trouvée dans la même région de Floride à cette époque, mais un cratère de taille modeste aurait pu s’éroder depuis.

Cependant, il existe des éléments soulevant des doutes quant aux conclusions de Meyer. Les billes de verre trouvées par Meyer et son équipe se situaient sur plusieurs couches de la carrière étudiée (quatre couches au total), indiquant que les mollusques les auraient absorbées sur une longue période de temps. Cela pose problème car il est très peu probable qu’un lieu précis soit touché plusieurs fois de suite par des météorites sur une longue période de temps.

Mais Meyer avance une explication convaincante à ce constat. Une seule et même collision aurait pu déposer des microtectites, ailleurs. Depuis là, ces dernières auraient été lentement érodées avant d’atteindre la carrière et finir dans les palourdes.

Source : Meteoritics and Planetary Science

[uk-fossils]

Fossil Pectin Shell – Eocene Epoch, Clallam Bay Washington USA, Genuine Bivalve Specimen

A well-preserved Fossil Pectin Shell (scallop) from the Eocene Epoch, approximately 40–50 million years old. This specimen was collected from the Clallam Formation near Clallam Bay, Washington State, USA, a site known for producing beautifully preserved marine invertebrate fossils from the early Paleogene period.

Pectin shells belong to the family Pectinidae, a group of marine bivalves distinguished by their fan-shaped, radially ribbed shells. This fossil showcases the elegant symmetry and surface ribbing typical of this family, preserved in fine-grained sediment.

Fossil Type: Bivalve (Scallop) Shell

Geological Age: Eocene – Ypresian to Lutetian Stages

Formation: Clallam Formation

Depositional Environment: The Clallam Formation was deposited in a shallow marine environment along a continental shelf. Calm conditions and fine silts contributed to the exceptional preservation of molluscs, echinoderms, and other invertebrates in the fossil record.

Morphological Features:

Distinct fan-shaped shell outline

Radiating ribs across the surface

Some specimens retain hinge or growth lines

Notable:

Classic marine invertebrate from the Eocene of the Pacific Northwest

Ideal for educational displays, fossil collectors, or palaeontology enthusiasts

The photograph shows the exact item offered for sale

Authenticity: All of our fossils are 100% genuine natural specimens and come with a Certificate of Authenticity. Please refer to the scale image for exact size – each square or cube equals 1cm.

This Eocene Pectin shell from Clallam Bay offers a glimpse into the marine ecosystems of ancient Washington. A beautiful and scientifically valuable specimen for any fossil enthusiast.

[uk-fossils]

RARE: Paracymatoceras hillii Fossil Nautilus – Albian, Cretaceous – Texas, USA – Alice Purnell Collection – 100% Genuine with Certificate

Offered here is a rare and scientifically important fossil nautilus of the species Paracymatoceras hillii from the Albian stage of the Lower Cretaceous period, dated to approximately 113 to 100.5 million years ago. This exceptional specimen was found in Texas, USA, and comes from the renowned Alice Purnell Collection, known for its meticulously catalogued, museum-grade fossil specimens.

Paracymatoceras hillii represents a genus of extinct nautiloid cephalopods that closely resemble modern nautiluses in shell shape but differ in suture complexity and internal chamber arrangement. These marine animals used gas-filled chambers within their coiled shells to control buoyancy and likely fed on small marine organisms while drifting through warm Cretaceous seas.

This fossil specimen displays excellent preservation of the shell’s coiling, form, and suture lines, making it both a valuable research piece and a stunning display item.

Geological Context: The Albian Stage of the Lower Cretaceous was a time of widespread shallow seas across what is now North America. These seas supported an abundance of marine life, including ammonites, nautiloids, bivalves, and marine reptiles. Fossiliferous sites in Texas have long been prized for their richness and exceptional preservation of marine fauna. Specimens like this Paracymatoceras provide crucial insights into nautiloid diversity and palaeoecology during the Cretaceous.

Key Details:

Species: Paracymatoceras hillii (Fossil Nautilus)

Fossil Type: Extinct marine nautiloid cephalopod

Age: Albian Stage, Lower Cretaceous (~113–100.5 million years ago)

Location Found: Texas, USA

Provenance: From the Alice Purnell Collection

Condition: Excellent preservation with clear spiral form and original shell detail

Authenticity: 100% genuine fossil, supplied with a Certificate of Authenticity

Scale: See photo with 1cm rule square/cube for accurate sizing

Photo: The exact specimen shown is what you will receive

Scientific & Collector Value: Fossil nautiloids are significantly rarer than ammonites, and examples like Paracymatoceras hillii are especially valuable due to their scientific use in biostratigraphy and their visual similarity to modern-day nautiluses. This specimen’s association with the Alice Purnell Collection adds an extra layer of provenance and trust, making it highly desirable for collectors, educators, and researchers.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Fast & Secure Shipping – Expertly packaged and promptly shipped for safe delivery.

Don’t miss the opportunity to own a rare and well-preserved Paracymatoceras hillii nautilus fossil from the Albian of Texas, USA—a true collector’s piece from the world-famous Alice Purnell Collection.

[uk-fossils]

RARE Fossil Triassic Ammonite INYOITES OWENI Thaynes Limestone Elko Nevada USA Authentic Specimen

This listing features a RARE and authentic ammonite fossil of Inyoites oweni, a ceratitid ammonoid from the Thaynes Limestone Formation, collected in Elko County, Nevada, USA. This scientifically significant specimen is from the Lower Triassic period, and is provided with a Certificate of Authenticity.

Inyoites oweni is classified as follows:

Order: Ceratitida

Superfamily: Inyoitoidea

Family: Inyoitidae

It dates to the Olenekian Stage of the Lower Triassic, approximately 247–251 million years ago, shortly after the Permian-Triassic mass extinction—the most severe biodiversity loss event in Earth’s history. Ammonoids such as Inyoites were among the early marine life to repopulate Triassic oceans.

The Thaynes Limestone Formation represents a shallow marine depositional environment characterized by carbonate mudstones, limestones, and occasional interbedded shales. This setting supported a thriving marine ecosystem including ammonoids, bivalves, gastropods, and marine reptiles.

Morphological Features:

Evolute, discoidal shell with widely spaced whorls

Prominent ribbing along the flanks

A relatively large umbilicus

Ceratitic suture lines, less complex than later Mesozoic ammonites

These features distinguish Inyoites oweni from other Early Triassic ammonoids and make it an important fossil for biostratigraphic correlation and evolutionary studies.

The specimen in this listing is the exact one shown in the photographs. Scale rule cubes/squares = 1cm. Full sizing details can be found in the images.

Specimen Overview:

Species: Inyoites oweni

Fossil Type: Ammonoid Shell

Formation: Thaynes Limestone

Age: Lower Triassic (Olenekian Stage)

Location: Elko County, Nevada, USA

Preservation: Natural limestone matrix with detailed shell impression

This Inyoites fossil is a rare post-extinction survivor species, ideal for collectors of Triassic marine life, evolutionary paleontology enthusiasts, or educators seeking genuine examples of early Mesozoic fauna.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

[uk-fossils]

Fossil Barnacle, Miocene Epoch, Hampton Virginia USA | Authentic Marine Invertebrate Specimen + COA

Fossil Barnacle – Miocene Epoch, Hampton, Virginia, United States

This authentic fossil barnacle comes from the Miocene-aged marine sediments of Hampton, Virginia, part of the geologically significant Chesapeake Group. Dating back approximately 15 to 10 million years, this fossil represents a once-thriving marine invertebrate that lived in the warm shallow seas covering the coastal southeastern United States during the Miocene Epoch.

Fossil Type & Classification:

Type: Invertebrate Fossil (Barnacle – Cirripede)

Phylum: Arthropoda

Subphylum: Crustacea

Class: Maxillopoda

Subclass: Thecostraca

Infraclass: Cirripedia (barnacles)

Order: Sessilia (acorn barnacles)

Family & Genus: Undetermined for this specimen (commonly Balanus species in the region)

Geological & Stratigraphic Details:

Location: Hampton, Virginia, USA

Formation: Likely part of the Chesapeake Group (e.g. Eastover or Yorktown Formations)

Epoch: Miocene (Neogene Period)

Age: ~15–10 million years ago

Depositional Environment: Shallow marine shelf with sandy to silty substrates, excellent for epifaunal marine organisms such as barnacles

Biozone: Associated with bivalves, gastropods, corals, and crustaceans of the Mid-Atlantic Miocene

Morphology & Features:

Calcareous plates forming the barnacle wall typically hexagonal or polygonal

Well-defined orifice and base plate characteristic of sessile barnacles

May occur as a solitary specimen or in cluster formation

Preserved in sandy matrix or as isolated calcareous fossil, showing growth ring patterns

Notable: Barnacle fossils like these are important for reconstructing nearshore marine habitats during the Miocene. Their presence in the fossil record helps researchers interpret palaeoecological conditions, such as salinity and substrate preferences, in ancient Atlantic coastal environments. Hampton and other Chesapeake localities are internationally known for Miocene marine invertebrate diversity.

Specimen Details:

Origin: Hampton, Virginia, USA

Fossil Type: Barnacle (Sessile Cirripede)

Geological Epoch: Miocene

Formation: Chesapeake Group (specific unit unconfirmed)

Size Reference: Scale cube = 1cm (see photo for full specimen size)

Note: The specimen shown in the listing photo is the exact item you will receive

Authenticity & Quality: This is a 100% genuine fossil, carefully sourced and not altered or reconstructed. It comes with a Certificate of Authenticity.

Why Choose This Fossil? Great for:

Marine invertebrate fossil collections

Educational displays in palaeontology or marine biology

Natural history décor and gifts

Miocene fossil enthusiasts and US coastal collectors

Shipping & Packaging: All items are packaged securely using eco-conscious materials and shipped with tracking. Fossils are handled with care to ensure safe delivery.

Own a real piece of North America’s Miocene shoreline with this fossil barnacle from the marine sediments of Hampton, Virginia.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

[phenomenalgems]

🐚💕 This cluster of fossilized calcite-replaced bivalve shells is a classic Floridian specimen! The cluster combines white shells with a clamshell that has been totally replaced by golden yellow calcite—a unique feature that sets this piece apart. As seen under UV, the calcite shell glows with amazing greenish-yellow brightness! Appealing and unusual, and a must for any fossil collection. 🐚 $78 shipped US—dm for details or comment to claim. 🌌 Keep an eye out for tons of new specimens in this week’s shop update, leading up to my biggest sale of the year! Visit PhenomenalGems.Etsy.com for details. 😍 #fossils #clamshell #fluorescent #uv #blacklight #ruckspit #fortdrum #okeechobee #florida #usa #floridabeaches #rocksandminerals #mineralspecimens #crystals #naturelovers #sciencelovers #motherearth #bigsale #phenomenalgems #rockshop #etsy #etsyshop #etsycrystals