Hemigarantia julii Ammonite Fossil Jurassic Bajocian Dorset UK Genuine Authentic COA

Description

Authentic Jurassic Fossil from Dorset, UK

This Hemigarantia julii ammonite fossil is a genuine and rare specimen from the Middle Bajocian stage of the Jurassic Period, discovered at Burton Bradstock, Dorset, United Kingdom. Known for its rich fossil deposits, Dorset’s Jurassic Coast and surrounding areas provide some of the finest and most scientifically significant ammonite fossils in the world. The photographs provided show the exact specimen you will receive, with a 1 cm scale cube for precise size reference. Each piece is supplied with a Certificate of Authenticity, confirming that it is 100% genuine and responsibly sourced.

Geological Age and Provenance

The fossil comes from Middle Bajocian strata, deposited approximately 170–168 million years ago. During this period, the region that is now Dorset was submerged beneath shallow, warm seas, part of the expansive Tethys Ocean system. Sediments of fine clays and limestones accumulated on the sea floor, creating ideal conditions for fossil preservation. These sediments have since yielded an abundance of ammonites, which are vital for understanding Jurassic marine ecosystems and global stratigraphic correlations.

Taxonomy and Classification

Hemigarantia julii belongs to the class Cephalopoda, order Ammonitida, superfamily Stephanoceratoidea, and family Stephanoceratidae. Ammonites in this family are noted for their strong ribbing and distinctive shell morphology. The genus Hemigarantia is an important marker within Bajocian biozones and contributes significantly to the study of Jurassic stratigraphy. Its distinct evolutionary traits make it both scientifically important and highly collectable.

Morphology and Distinctive Features

This specimen demonstrates the diagnostic features of Hemigarantia julii. The shell is planispiral, moderately involute, and ornamented with robust ribs that radiate from the umbilical margin and extend boldly across the flanks. These ribs continue over the venter, giving the ammonite a strikingly ornamental appearance. The strength and symmetry of the ribbing not only provided mechanical reinforcement to the shell but also act as key identifiers for paleontologists. Its morphological precision makes this fossil an exceptional example for collectors and researchers alike.

Scientific and Stratigraphic Importance

Ammonites like Hemigarantia julii play a critical role in biostratigraphy. Their relatively short evolutionary ranges and distinctive morphology allow them to be used as index fossils, which help define Bajocian biozones and correlate rock layers across wide geographical regions. This has made them invaluable in reconstructing Jurassic timescales and environments. Collectors value these fossils not only for their beauty but also for their direct role in shaping our understanding of Earth’s geological history.

Condition and Presentation

The fossil has been carefully prepared to reveal the intricate ribbing and coiling patterns that define the species. Its preservation is excellent, with natural detail visible across its surface. The photographs show the exact specimen you will receive—this is a unique fossil, not a cast or reproduction. Its scientific value, combined with its aesthetic appeal, makes it suitable for display in private collections, museums, or educational institutions.

Guarantee of Authenticity

All of our fossils are guaranteed 100% genuine and responsibly sourced. Each specimen is carefully identified and comes with a Certificate of Authenticity for complete peace of mind. This Hemigarantia julii ammonite from Burton Bradstock, Dorset, represents a rare opportunity to own a scientifically significant fossil from the Middle Bajocian stage of the Jurassic Period. It is an outstanding addition for collectors, enthusiasts, and educators alike.