Rare Asteroceras blakei Ammonite Fossil Jurassic UK Authentic Specimen with Certificate COA
£ 36.00
RARE ASTEROCERAS BLAKEI AMMONITE FOSSILThis listing features a rare Asteroceras blakei Ammonite Fossil, collected from
the Lower Sinemurian stage of the Early Jurassic, found at Robin Hood’s Bay, Yorkshire, United Kingdom. Dating to approximately 199–196 million years ago, this ammonite is a classic example of the Early Jurassic faunas of northern England. The specimen shown in the photographs is the exact one you will receive, with a 1 cm scale cube included for reference. Every fossil comes with a Certificate of Authenticity, guaranteeing it as a 100% genuine specimen. GEOLOGICAL CONTEXT – SINEMURIAN OF ROBIN HOOD’S BAYThe coastal exposures at Robin Hood’s Bay are world-famous for their Early Jurassic fossil record. The Sinemurian deposits here consist largely of shales and limestones laid down in shallow marine environments connected to the European epicontinental seas. These rocks preserve one of the richest ammonite faunas in Britain, making the site a key locality for paleontology and stratigraphy.The Lower Sinemurian marks an important stage in Jurassic history, following the Triassic–Jurassic boundary events and representing a period of marine recovery and diversification. Ammonites such as Asteroceras blakei are important biozonal species, allowing geologists to define and correlate stratigraphic horizons across Europe. SPECIES OVERVIEW – ASTEROCERAS BLAKEIThe specimen belongs to the genus Asteroceras, within the order Ammonitida, superfamily Eoderoceratoidea, and family Arietitidae. This genus is one of the most recognisable ammonites of the Sinemurian, known for its distinctive ornamentation and robust shells.Asteroceras blakei is characterised by its moderately evolute shell, with strong radial ribbing that continues across the venter. These ribs provide a striking symmetry, giving the shell a star-like pattern that inspired the genus name Asteroceras (meaning “star-horn”). The whorls are relatively broad, and the ribbing is typically simple and unbifurcated, distinguishing this species from closely related forms.Its morphology not only makes Asteroceras blakei visually attractive but also provides valuable diagnostic features that paleontologists use to refine Sinemurian biostratigraphy. PALEONTOLOGICAL IMPORTANCEAsteroceras blakei is a significant index fossil for the Lower Sinemurian stage. Its restricted stratigraphic range and distinctive shell make it an ideal tool for dating Jurassic marine strata. Fossils from Robin Hood’s Bay have long been central to establishing ammonite biozones, and Asteroceras species in particular are considered classic reference fossils.The strong ribbing and shell structure also shed light on evolutionary trends within the Arietitidae, reflecting adaptations to open-marine environments and predatory pressures. Specimens like this one offer valuable insights into ammonite paleobiology and the ecological dynamics of Early Jurassic seas. COLLECTOR’S AND EDUCATIONAL VALUEThis Asteroceras blakei ammonite fossil is an outstanding acquisition for serious collectors of British ammonites, particularly those specialising in Jurassic Coast and Yorkshire material. Its provenance from Robin Hood’s Bay, one of the UK’s most celebrated fossil localities, enhances its value and desirability.For education and research, this fossil serves as an ideal teaching specimen. Its ribbing, shell form, and biostratigraphic importance make it a perfect example of how ammonites are used in geology to divide and date Earth’s history. The aesthetic appeal of its ornamentation also makes it a beautiful display piece, combining scientific significance with natural beauty. GUARANTEE OF AUTHENTICITY
• 100% genuine Asteroceras blakei ammonite fossil
• Supplied with a Certificate of Authenticity
• Exact specimen shown in the photographs will be sentThis is a rare opportunity to own a scientifically important and beautifully preserved Asteroceras blakei Ammonite Fossil from the Lower Sinemurian of Robin Hood’s Bay, United Kingdom, a true highlight for any fossil collection.
the Lower Sinemurian stage of the Early Jurassic, found at Robin Hood’s Bay, Yorkshire, United Kingdom. Dating to approximately 199–196 million years ago, this ammonite is a classic example of the Early Jurassic faunas of northern England. The specimen shown in the photographs is the exact one you will receive, with a 1 cm scale cube included for reference. Every fossil comes with a Certificate of Authenticity, guaranteeing it as a 100% genuine specimen. GEOLOGICAL CONTEXT – SINEMURIAN OF ROBIN HOOD’S BAYThe coastal exposures at Robin Hood’s Bay are world-famous for their Early Jurassic fossil record. The Sinemurian deposits here consist largely of shales and limestones laid down in shallow marine environments connected to the European epicontinental seas. These rocks preserve one of the richest ammonite faunas in Britain, making the site a key locality for paleontology and stratigraphy.The Lower Sinemurian marks an important stage in Jurassic history, following the Triassic–Jurassic boundary events and representing a period of marine recovery and diversification. Ammonites such as Asteroceras blakei are important biozonal species, allowing geologists to define and correlate stratigraphic horizons across Europe. SPECIES OVERVIEW – ASTEROCERAS BLAKEIThe specimen belongs to the genus Asteroceras, within the order Ammonitida, superfamily Eoderoceratoidea, and family Arietitidae. This genus is one of the most recognisable ammonites of the Sinemurian, known for its distinctive ornamentation and robust shells.Asteroceras blakei is characterised by its moderately evolute shell, with strong radial ribbing that continues across the venter. These ribs provide a striking symmetry, giving the shell a star-like pattern that inspired the genus name Asteroceras (meaning “star-horn”). The whorls are relatively broad, and the ribbing is typically simple and unbifurcated, distinguishing this species from closely related forms.Its morphology not only makes Asteroceras blakei visually attractive but also provides valuable diagnostic features that paleontologists use to refine Sinemurian biostratigraphy. PALEONTOLOGICAL IMPORTANCEAsteroceras blakei is a significant index fossil for the Lower Sinemurian stage. Its restricted stratigraphic range and distinctive shell make it an ideal tool for dating Jurassic marine strata. Fossils from Robin Hood’s Bay have long been central to establishing ammonite biozones, and Asteroceras species in particular are considered classic reference fossils.The strong ribbing and shell structure also shed light on evolutionary trends within the Arietitidae, reflecting adaptations to open-marine environments and predatory pressures. Specimens like this one offer valuable insights into ammonite paleobiology and the ecological dynamics of Early Jurassic seas. COLLECTOR’S AND EDUCATIONAL VALUEThis Asteroceras blakei ammonite fossil is an outstanding acquisition for serious collectors of British ammonites, particularly those specialising in Jurassic Coast and Yorkshire material. Its provenance from Robin Hood’s Bay, one of the UK’s most celebrated fossil localities, enhances its value and desirability.For education and research, this fossil serves as an ideal teaching specimen. Its ribbing, shell form, and biostratigraphic importance make it a perfect example of how ammonites are used in geology to divide and date Earth’s history. The aesthetic appeal of its ornamentation also makes it a beautiful display piece, combining scientific significance with natural beauty. GUARANTEE OF AUTHENTICITY
• 100% genuine Asteroceras blakei ammonite fossil
• Supplied with a Certificate of Authenticity
• Exact specimen shown in the photographs will be sentThis is a rare opportunity to own a scientifically important and beautifully preserved Asteroceras blakei Ammonite Fossil from the Lower Sinemurian of Robin Hood’s Bay, United Kingdom, a true highlight for any fossil collection.
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