Euagassiceras resupinatum Ammonite Fossil Jurassic Sinemurian Redcar UK Rare Authentic COA
£ 36.00
EXCEPTIONALLY RARE LOWER JURASSIC FOSSILThis is a very rare specimen of Euagassiceras resupinatum, an ammonite from the
Lower Sinemurian stage of the Jurassic Period, discovered at Redcar, United Kingdom. This locality is part of the renowned Cleveland Basin exposures along the Yorkshire coast, known for producing scientifically important ammonite assemblages. The fossil comes with a Certificate of Authenticity and is 100% genuine, carefully selected, and photographed to show the exact specimen you will receive. A 1 cm scale cube is included in the photographs to provide accurate sizing. GEOLOGICAL AGE AND FORMATIONThe Euagassiceras resupinatum ammonite dates to the Lower Sinemurian, approximately 199–196 million years ago. During this time, northern England was covered by shallow epicontinental seas linked to the greater Tethys Ocean. The region’s sedimentary deposits consist mainly of laminated shales and fine sandstones, representing low-energy marine environments where organic material and calcareous shells were preserved. These conditions created exceptional fossil beds, preserving ammonites in great detail and allowing scientists to reconstruct the evolutionary history of cephalopods during the early Jurassic. TAXONOMY AND CLASSIFICATIONThis species belongs to the class Cephalopoda, order Ammonitida, superfamily Psiloceratoidea, and family Echioceratidae. Euagassiceras is a significant genus within Lower Sinemurian ammonite faunas, and E. resupinatum is one of its most recognisable species. Its fossils are particularly valuable in biostratigraphy, marking key intervals within the Sinemurian and helping geologists define ammonite zones with precision. MORPHOLOGICAL FEATURESEuagassiceras resupinatum is noted for its evolute shell, where the whorls are only slightly overlapping, producing a wide umbilicus. The ribs are sharp and well-defined, radiating cleanly across the flanks and extending uninterrupted across the venter. These features give the fossil a distinctive, elegant appearance that differentiates it from contemporaneous genera. The specimen’s morphology provides insights into hydrodynamic adaptations of ammonites, reflecting their role as active swimmers in Lower Jurassic seas. SCIENTIFIC AND STRATIGRAPHIC SIGNIFICANCEThe presence of Euagassiceras resupinatum is critical for defining the Resupinatum Zone of the Lower Sinemurian. Its restricted stratigraphic range and easily recognisable features make it an important index fossil. Ammonites such as this specimen are used globally by paleontologists to correlate Lower Jurassic strata, ensuring accurate dating of sedimentary layers. Owning a specimen of E. resupinatum is not only a collector’s opportunity but also a connection to the very fossils that underpin Jurassic time scales. CONDITION AND PREPARATIONThis fossil has been carefully prepared to reveal its natural ribbing, whorl structure, and diagnostic characteristics. The preservation is excellent, with detail visible across the entire shell. The piece displays naturally occurring features formed over millions of years, with no artificial enhancement or replication. Its scientific accuracy and visual appeal make it equally suited for private collectors, educational displays, or as a centerpiece in a natural history collection. AUTHENTICITY GUARANTEEDWe guarantee that all of our specimens are 100% genuine and responsibly sourced. Every fossil is supplied with a Certificate of Authenticity to ensure confidence in your purchase. This Euagassiceras resupinatum ammonite from Redcar, United Kingdom, is an exceptionally rare specimen from the Lower Sinemurian, Jurassic, offering both scientific value and natural beauty. It represents a unique chance to own a fossil that played a key role in defining early Jurassic ammonite zones and continues to be prized by paleontologists and collectors worldwide.
Lower Sinemurian stage of the Jurassic Period, discovered at Redcar, United Kingdom. This locality is part of the renowned Cleveland Basin exposures along the Yorkshire coast, known for producing scientifically important ammonite assemblages. The fossil comes with a Certificate of Authenticity and is 100% genuine, carefully selected, and photographed to show the exact specimen you will receive. A 1 cm scale cube is included in the photographs to provide accurate sizing. GEOLOGICAL AGE AND FORMATIONThe Euagassiceras resupinatum ammonite dates to the Lower Sinemurian, approximately 199–196 million years ago. During this time, northern England was covered by shallow epicontinental seas linked to the greater Tethys Ocean. The region’s sedimentary deposits consist mainly of laminated shales and fine sandstones, representing low-energy marine environments where organic material and calcareous shells were preserved. These conditions created exceptional fossil beds, preserving ammonites in great detail and allowing scientists to reconstruct the evolutionary history of cephalopods during the early Jurassic. TAXONOMY AND CLASSIFICATIONThis species belongs to the class Cephalopoda, order Ammonitida, superfamily Psiloceratoidea, and family Echioceratidae. Euagassiceras is a significant genus within Lower Sinemurian ammonite faunas, and E. resupinatum is one of its most recognisable species. Its fossils are particularly valuable in biostratigraphy, marking key intervals within the Sinemurian and helping geologists define ammonite zones with precision. MORPHOLOGICAL FEATURESEuagassiceras resupinatum is noted for its evolute shell, where the whorls are only slightly overlapping, producing a wide umbilicus. The ribs are sharp and well-defined, radiating cleanly across the flanks and extending uninterrupted across the venter. These features give the fossil a distinctive, elegant appearance that differentiates it from contemporaneous genera. The specimen’s morphology provides insights into hydrodynamic adaptations of ammonites, reflecting their role as active swimmers in Lower Jurassic seas. SCIENTIFIC AND STRATIGRAPHIC SIGNIFICANCEThe presence of Euagassiceras resupinatum is critical for defining the Resupinatum Zone of the Lower Sinemurian. Its restricted stratigraphic range and easily recognisable features make it an important index fossil. Ammonites such as this specimen are used globally by paleontologists to correlate Lower Jurassic strata, ensuring accurate dating of sedimentary layers. Owning a specimen of E. resupinatum is not only a collector’s opportunity but also a connection to the very fossils that underpin Jurassic time scales. CONDITION AND PREPARATIONThis fossil has been carefully prepared to reveal its natural ribbing, whorl structure, and diagnostic characteristics. The preservation is excellent, with detail visible across the entire shell. The piece displays naturally occurring features formed over millions of years, with no artificial enhancement or replication. Its scientific accuracy and visual appeal make it equally suited for private collectors, educational displays, or as a centerpiece in a natural history collection. AUTHENTICITY GUARANTEEDWe guarantee that all of our specimens are 100% genuine and responsibly sourced. Every fossil is supplied with a Certificate of Authenticity to ensure confidence in your purchase. This Euagassiceras resupinatum ammonite from Redcar, United Kingdom, is an exceptionally rare specimen from the Lower Sinemurian, Jurassic, offering both scientific value and natural beauty. It represents a unique chance to own a fossil that played a key role in defining early Jurassic ammonite zones and continues to be prized by paleontologists and collectors worldwide.
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