RARE Fossil Gryphaea vesicularis kryt Multi-Block | Maastrichtian Cretaceous | Groeve ‘t Rooth Netherlands | Authentic Certified Specimen

Description

This listing features a rare multi-specimen block of the extinct oyster Gryphaea vesicularis kryt, a species from the Upper Cretaceous (Maastrichtian) stage, discovered in Groeve ‘t Rooth, near Maastricht, Netherlands.

This beautiful fossil block showcases several well-preserved Gryphaea individuals in association, making it a highly collectible and geologically informative specimen. These ancient bivalves are notable for their curved “devil’s toenail” shells, and this multi-block provides a vivid snapshot of a benthic marine community just before the end-Cretaceous mass extinction.

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity.

You will receive the exact specimen photographed. A 1cm scale cube and/or ruled squares are included in the image for accurate size reference. Please see the photo for full sizing.

Geological and Taxonomic Information:

• Species: Gryphaea vesicularis kryt
• Fossil Type: Bivalve mollusc (extinct oyster)
• Age: Maastrichtian Stage, Late Cretaceous (approximately 72 to 66 million years ago)
• Formation: Maastricht Formation
• Locality: Groeve ‘t Rooth quarry, Maastricht area, Limburg, Netherlands
• Depositional Environment: Shallow marine carbonate platform – warm, tropical to subtropical epicontinental sea
• Biozone: Often associated with Belemnella lanceolata and Pecten fauna in the Upper Maastrichtian biostratigraphy

Taxonomic Classification:

• Order: Ostreida
• Superfamily: Ostreoidea
• Family: Gryphaeidae
• Genus: Gryphaea
• Species: Gryphaea vesicularis
• Subspecies/Form: kryt (a local variant or morphotype)

Morphology & Notable Features:

• Strongly curved, thick-shelled bivalves with a prominent coiled beak (umbo)
• The shell exhibits vesicular (blistered/pitted) ornamentation, contributing to its subspecific identification as vesicularis kryt
• Well-developed concentric growth lines
• The multi-block formation suggests natural deposition and burial with minimal post-mortem transport
• These oysters often formed part of oyster beds or shell banks on Cretaceous seafloors

Scientific Significance:

Gryphaea vesicularis is a key taxon in Maastrichtian paleontology and biostratigraphy and is often used to characterise marine benthic communities in the closing stages of the Cretaceous period. Its abundance in the Maastricht Formation makes it a regional fossil indicator, particularly in the Netherlands and northern Europe.

The Maastrichtian Stage, from which the term “Maastrichtian” itself originates, is the final stage of the Cretaceous period, directly preceding the Cretaceous–Paleogene (K–Pg) extinction event. Fossils from this formation represent some of the last flourishing marine ecosystems before the global extinction event that wiped out non-avian dinosaurs and many marine species.

Specimen Details:

• Multi-individual fossil block with several Gryphaea shells in natural arrangement
• From a well-known European type locality with exceptional preservation
• Suitable for display, research, or collection enhancement
• Professionally prepared with original matrix retained where appropriate

Authenticity & Guarantee:

We guarantee that this is a 100% genuine fossil, legally and ethically sourced, and it will be accompanied by a Certificate of Authenticity. Every piece is carefully selected for quality and scientific value.

Ideal For:

• Serious fossil collectors
• Natural history educators
• Museums and institutions
• Gift-givers seeking unique geological items
• Enthusiasts of the Maastrichtian and K–Pg boundary ecosystems