Fossils for Sale - High-quality BRITISH and WORLDWIDE Fossils. An impressive selection of fossils, including Ammonites, Trilobites, Belemnites, Fossil Fish, Fossil Shark Teeth, Fossilised Insects in Amber, Dinosaurs, and Reptiles. UK Fossils was formed in 1988 and collects and preps our own fossils in the heart of the Jurassic Coast, collecting fossils from Lyme Regis, Charmouth and Somerset. Our passion for fossils is reflected in our carefully curated collection, which includes some of the rarest and most unique specimens available.

FREE UK DELIVERY - Save up to 60%

SALE 10%
RARE Triassic Ammonite Fossil – JUVENITES SEPTENTRIONALIS – Thaynes Limestone – Lower Triassic – Elko County, Nevada, USA

RARE Triassic Ammonite Fossil – JUVENITES SEPTENTRIONALIS – Thaynes Limestone – Lower Triassic – Elko County, Nevada, USA

Original price was: £18.00.Current price is: £16.20.

This listing features a RARE and scientifically valuable Triassic ammonite fossil of the species Juvenites septentrionalis, found in the iconic Thaynes Limestone Formation of Elko County, Northeastern Nevada, USA. An extraordinary example of marine life that emerged after the Permian-Triassic extinction event.

Fossil Type & Species:

  • Type: Fossilised Ammonite (extinct marine cephalopod)
  • Species: Juvenites septentrionalis

Geological Context:

  • Era: Mesozoic
  • Period: Triassic
  • Stage: Lower Triassic (Spathian)
  • Formation: Thaynes Limestone
  • Locality: Elko County, Nevada, USA
  • Depositional Environment: Shallow marine carbonate shelf; part of an epicontinental sea rich in early Mesozoic marine fauna

Morphological Features:

  • Small to medium-sized planispiral shell
  • Fine ribbing across the whorls and a gently rounded venter
  • Ceratitic suture patterns, typical of Triassic ammonoids

Scientific Notes:

  • Juvenites septentrionalis is a key representative of post-extinction recovery fauna and provides critical data for understanding ammonoid evolution during the Early Triassic.
  • The Thaynes Limestone is a world-renowned formation for Lower Triassic ammonoids and is crucial for biostratigraphic zonation.

Taxonomy:

  • Order: Ceratitida
  • Superfamily: Meekoceratoidea
  • Family: Juvenitidae
  • Formally Described By: Known from systematic Triassic ammonoid works in North American paleontology

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. The fossil shown in the photograph is the exact piece you will receive.

Please refer to the image for exact sizing – Scale cube = 1cm.

This is a striking and informative specimen ideal for collectors focused on Triassic faunas, ammonoid evolution, or rare North American fossil finds.

(Actual as seen)

Only 1 left in stock

SKU: SF0288 Category:

Description

This listing features a RARE and scientifically valuable Triassic ammonite fossil of the species Juvenites septentrionalis, found in the iconic Thaynes Limestone Formation of Elko County, Northeastern Nevada, USA. An extraordinary example of marine life that emerged after the Permian-Triassic extinction event.

Fossil Type & Species:

  • Type: Fossilised Ammonite (extinct marine cephalopod)
  • Species: Juvenites septentrionalis

Geological Context:

  • Era: Mesozoic
  • Period: Triassic
  • Stage: Lower Triassic (Spathian)
  • Formation: Thaynes Limestone
  • Locality: Elko County, Nevada, USA
  • Depositional Environment: Shallow marine carbonate shelf; part of an epicontinental sea rich in early Mesozoic marine fauna

Morphological Features:

  • Small to medium-sized planispiral shell
  • Fine ribbing across the whorls and a gently rounded venter
  • Ceratitic suture patterns, typical of Triassic ammonoids

Scientific Notes:

  • Juvenites septentrionalis is a key representative of post-extinction recovery fauna and provides critical data for understanding ammonoid evolution during the Early Triassic.
  • The Thaynes Limestone is a world-renowned formation for Lower Triassic ammonoids and is crucial for biostratigraphic zonation.

Taxonomy:

  • Order: Ceratitida
  • Superfamily: Meekoceratoidea
  • Family: Juvenitidae
  • Formally Described By: Known from systematic Triassic ammonoid works in North American paleontology

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. The fossil shown in the photograph is the exact piece you will receive.

Please refer to the image for exact sizing – Scale cube = 1cm.

This is a striking and informative specimen ideal for collectors focused on Triassic faunas, ammonoid evolution, or rare North American fossil finds.

Additional information

Era

Triassic
Origin

USA

Triassic Information

The Triassic Period (252–201 million years ago) marked the beginning of the Mesozoic Era, following the Permian-Triassic mass extinction, the most severe extinction event in Earth's history. The climate was hot and dry, with vast deserts and little polar ice. Life slowly recovered, leading to the rise of the first dinosaurs, pterosaurs (flying reptiles), and early mammals. Reptiles, including large archosaurs (ancestors of crocodiles and dinosaurs), dominated both land and sea. In the oceans, ichthyosaurs and plesiosaurs thrived alongside ammonites and early coral reefs. The first true conifers and ginkgo trees spread across the land. The period ended with another mass extinction, paving the way for the Jurassic and the golden age of dinosaurs.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Related products