Rare Staufenia opalinoides Ammonite Fossil 5″ Jurassic Aalenian Germany Watrach Display Specimen Authentic

Description

Authentic Jurassic Ammonite from Germany’s Aalenian Strata

This rare 5-inch Staufenia opalinoides ammonite fossil originates from the Aalenian stage of the Middle Jurassic, discovered in the well-known fossil locality of Watrach, Germany. German Jurassic deposits are globally recognised for their exceptional preservation and scientific importance, making specimens from this region highly desirable among collectors and palaeontology enthusiasts. This carefully selected fossil presents a fine example of early Middle Jurassic marine life, preserved in remarkable detail.

Geological Setting and Age

The Aalenian stage, dating to approximately 174–170 million years ago, marks the beginning of the Middle Jurassic period. During this time, much of Europe was covered by shallow epicontinental seas, creating ideal conditions for marine organisms such as ammonites to thrive. The sediments of southern Germany, including those at Watrach, were laid down in calm marine environments where fine muds and silts settled on the sea floor, allowing for excellent fossilisation.

These fossil-bearing layers are often associated with the Opalinuston Formation, a clay-rich deposit known for preserving ammonites with exceptional clarity. The relatively low oxygen conditions at the seabed helped reduce decay and scavenging, contributing to the preservation of intricate shell features.

Species and Scientific Classification

Staufenia opalinoides belongs to the order Ammonitida and is part of the family Hammatoceratidae within the superfamily Hammatoceratoidea. This group of ammonites is particularly characteristic of the Aalenian stage and plays an important role in biostratigraphy, helping geologists date and correlate rock layers across Europe.

The species name opalinoides reflects its association with the Opalinum biozone, a key subdivision within the Aalenian. Fossils from this zone are important index fossils, used extensively in stratigraphic studies due to their relatively short geological range and widespread distribution.

Morphology and Distinctive Features

This ammonite displays a classic planispiral form, with tightly coiled whorls and a moderately involute shell structure. The ribbing is fine yet clearly defined, often radiating across the flanks with subtle curvature. In Staufenia opalinoides, the ribbing tends to be more delicate compared to later Jurassic ammonites, reflecting its position in the evolutionary timeline.

The venter is typically rounded to slightly flattened, and the overall shell form is compact and balanced. Despite its moderate size at approximately 5 inches, the specimen retains strong visual appeal due to its clean preservation and well-defined ornamentation.

Authenticity and Display Quality

This fossil is a genuine specimen, carefully chosen for its quality, detail, and display potential. The photograph provided shows the exact ammonite you will receive, ensuring complete transparency and confidence in your purchase. Its natural preservation highlights millions of years of geological history in a single, tangible piece.

Included with the fossil is a Certificate of Authenticity lifetime guarantee card, confirming the specimen’s legitimacy and origin. This provides reassurance for collectors and adds lasting value to the piece.

A Distinctive Collector’s Fossil

Ammonites from the Aalenian of Germany are highly regarded for their scientific significance and aesthetic qualities. Staufenia opalinoides represents an important stage in ammonite evolution, bridging earlier Jurassic forms with the more complex species that followed.

This specimen offers a unique opportunity to own a genuine fossil from a pivotal moment in Earth’s history, combining geological importance with natural beauty. Its size, provenance, and preservation make it an excellent addition to any fossil collection or display.