RARE Aegasteroceras sagittarium Ammonite Fossil – Lower Jurassic, Frodingham Ironstone Formation, Scunthorpe UK

Description

Available here is a rare and scientifically significant ammonite fossil, Aegasteroceras sagittarium, collected from the Frodingham Ironstone Formation at Conesby Quarry, Scunthorpe, North Lincolnshire, England. This beautifully preserved specimen dates to the Lower Jurassic, specifically the Denotatus Subzone of the Obtusum Zone within the Lower Lias Group.

Fossil Type & Species:

• Type: Ammonite (Extinct Cephalopod Mollusc)
• Species: Aegasteroceras sagittarium
• Known for its robust shell with distinct ribbing and inflated whorls

Geological Context:

• Period: Mesozoic Era
• System: Jurassic
• Epoch: Early Jurassic
• Stage: Hettangian to Sinemurian
• Zone: Obtusum Zone
• Subzone: Denotatus Subzone
• Formation: Frodingham Ironstone Formation (part of the Lias Group)
• Depositional Environment: Shallow marine shelf with iron-rich muds and sands. These environments supported diverse marine life and provided ideal conditions for fossil preservation, particularly within ironstone nodules and lenses.

Morphological Features:

• Strongly ribbed, inflated shell
• Involute coiling with a compressed to moderately depressed whorl section
• Fine suture patterns often visible on well-preserved specimens
• Characteristic features that distinguish Aegasteroceras from other Lower Lias ammonites

Scientific Importance:

• Aegasteroceras sagittarium is a biostratigraphically important species in the Denotatus Subzone, used for correlation within Lower Jurassic marine sequences in the UK
• This fossil offers insight into ammonite evolution shortly after the end-Triassic extinction event
• Material from Scunthorpe localities is considered highly collectible and stratigraphically precise

Locality Information:

• Conesby Quarry, Scunthorpe, North Lincolnshire, UK – an important Lower Jurassic locality yielding exceptionally preserved ammonites from the Frodingham Ironstone Formation

Authenticity & Display:

All of our fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. The photographs in the listing show the exact fossil you will receive. Please refer to the image for full sizing, with the scale cube = 1cm.

This is a premium ammonite specimen of Aegasteroceras sagittarium, ideal for collectors, educators, and those with a passion for British Jurassic palaeontology.

Add a well-documented Lower Jurassic ammonite fossil to your collection—an authentic relic from over 190 million years ago!