Stromatolite fossil – cotham marble algal structure – triassic period – bristol, uk – 100% genuine with certificate

Description This listing features a genuine stromatolite fossil from the Cotham Marble of the Triassic period, discovered in the Bristol area of the United Kingdom. These remarkable specimens represent the fossilised remains of ancient microbial colonies, and are some of the oldest types of evidence we have for life on Earth. Stromatolites are layered sedimentary structures formed by the activity of microbial mats—primarily cyanobacteria, among the earliest photosynthesising organisms. These microbes trapped and bound sedimentary grains over time, creating distinctive banded patterns in rock. The resulting fossil preserves both the physical and biological processes of these ancient colonies. This particular specimen comes from the famous Cotham Marble, a well-known decorative and geological feature from the Late Triassic (~210 million years ago). Despite its name, Cotham Marble is a limestone, not a true marble, and is famous for its intricate tree-like or dendritic patterns. These patterns are now understood to be fossilised stromatolites, not mineral veining as once believed. Geological Context: The Cotham Marble occurs in the Blue Lias Formation, a sequence of limestones and shales laid down in marine environments in the Late Triassic. At that time, the area that is now southern England was part of a warm, shallow sea where microbial life flourished in tidal flats, forming layered stromatolite colonies. Key Details: Type: Stromatolite (microbial sedimentary structure) Formation: Cotham Marble, part of the Blue Lias Group Age: Triassic Period (~210 million years ago) Location Found: Bristol, United Kingdom Condition: Naturally preserved with visible banding and structural texture Authenticity: 100% genuine specimen, supplied with a Certificate of Authenticity Scale: Refer to 1cm cube in image for accurate sizing Photo: The exact specimen shown is what you will receive Scientific & Display Value: Stromatolites are of immense scientific importance, as they represent some of the earliest complex ecosystems on Earth. Though the oldest known examples date back over 3.5 billion years, these younger Triassic stromatolites still showcase the evolutionary continuity of microbial life. This piece is both a stunning display item and a profound symbol of early life on Earth. Perfect for fossil collectors, geology enthusiasts, science educators, or as a decorative and educational conversation piece. ACTUAL AS SEEN: This is a carefully chosen and photographed specimen. While we make every effort to provide accurate sizing, natural fossil shapes may vary. Colours may differ depending on lighting and monitor settings. Once this item is sold, it will be replaced with a new unique listing. All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity! Fast & Secure Shipping – Professionally packed and shipped promptly for safe delivery. Add a unique slice of microbial Earth history to your collection with this authentic stromatolite fossil from the Triassic Cotham Marble of Bristol, UK.