VERY RARE: Mariella bergerii Heteromorph Ammonite Fossil with Echinoids & Gastropods – Upper Albian, Cretaceous – Alice Purnell Collection

Description VERY RARE FOSSIL ASSEMBLAGE – MARIELLA BERGERII HETEROMORPH AMMONITE WITH ECHINOIDS & GASTROPODS – UPPER ALBIAN, CRETACEOUS – PÉNZESGYŐR, HUNGARY This is a rare and scientifically significant fossil specimen featuring the heteromorph ammonite Mariella bergerii, accompanied by associated echinoid and gastropod fossils, offering a unique palaeoecological snapshot from the Upper Albian stage of the Cretaceous period, approximately 105–100.5 million years ago. The specimen was collected from Pénzesgyőr, Veszprém county, Hungary, a well-documented Cretaceous fossil locality, and forms part of the esteemed Alice Purnell Collection, ensuring its authenticity, careful curation, and high-quality preservation. The actual specimen is shown in the listing photographs. Scale rule cube = 1cm. Please refer to the photos for full sizing. All fossils sold by us are fully 100% genuine and come with a Certificate of Authenticity. FOSSIL DETAILS & GEOLOGICAL CONTEXT: Ammonite Species: Mariella bergerii Additional Invertebrates: Associated fossil echinoids and gastropods Fossil Type: Heteromorph ammonite (irregular shell coiling) Age: Upper Albian, Late Early Cretaceous Estimated Age Range: ~105–100.5 million years ago Location: Pénzesgyőr, Veszprém county, Hungary Formation: Likely part of the Schlier Formation or related shallow marine sequences of the Transdanubian Central Range Depositional Environment: Shallow marine shelf with fine carbonate sedimentation Family: Turrilitidae Superfamily: Turrilitoidea Order: Ammonitida Class: Cephalopoda Phylum: Mollusca Identified as: Mariella bergerii by regional Cretaceous specialists (formal identifier not specified) Collection: From the Alice Purnell Collection MORPHOLOGICAL & PALAEOECOLOGICAL NOTES: Mariella species are known for their loosely coiled, turreted, heteromorph shells, a feature that made them poorly adapted for active swimming but well-suited to floating or drifting in shallow marine environments. The presence of associated echinoids and gastropods suggests this block preserves a natural assemblage, providing valuable context about the ecosystem it was part of. This fossil may correlate with the Stoliczkaia dispar Zone, a common biozone marker within the Upper Albian of Europe. Its preservation in fine-grained marine sediment hints at a quiet depositional environment, likely part of a broad continental shelf area during a time of global marine transgression. WHY THIS SPECIMEN IS UNIQUE: Features Mariella bergerii, a rarely offered heteromorph ammonite Includes multiple marine fossil types in one slab Represents a genuine Upper Albian Cretaceous palaeocommunity Sourced from Hungary’s historically important Veszprém fossil region Part of the curated Alice Purnell Collection Supplied with a Certificate of Authenticity SUMMARY: Main Fossil: Mariella bergerii ammonite Other Fossils: Echinoids and gastropods Age: Upper Albian, Cretaceous (~105–100.5 Ma) Location: Pénzesgyőr, Veszprém county, Hungary Geology: Shallow marine shelf sediments Preservation: Multiple fossils on one matrix; excellent coiling and detail Includes: Certificate of Authenticity Scale: Refer to photo with 1cm cube Collection: Alice Purnell A rare opportunity to own a fossil from a richly diverse mid-Cretaceous ecosystem in a remarkable state of preservation.