Description
Fossil Ammonite Identification
This striking fossil is identified as Diadochoceras nodocostatum, a rare ammonite specimen presented in the macroconch form. With its substantial 9.5-inch size, it is an eye-catching addition to a fossil collection, natural history display, study cabinet or geological interior. The specimen is associated with Mexico, and full sizing is shown in the photographs for close reference.
Geological Classification
The fossil is identified as Upper Aptian, Cretaceous. The Aptian is a recognised stage within the Cretaceous Period and forms part of the Early Cretaceous geological record. Ammonites from this interval are especially valued by collectors because they document the diversity of extinct marine cephalopods during an important period in Earth history.
Ammonite and Macroconch Context
Ammonites were extinct marine molluscs related to modern cephalopods. Their fossils are commonly recognised by their coiled shells and chambered construction, although the precise appearance and preservation can vary between specimens. In ammonite terminology, “macroconch” refers to the larger adult form in a sexually dimorphic pair. This identification makes the specimen particularly appealing to collectors who focus on ammonite taxonomy, Cretaceous palaeontology and comparative fossil morphology.
Diadochoceras nodocostatum is a specialist identification that gives this specimen strong appeal beyond a general ammonite classification. It is well suited to collectors seeking unusual named taxa, Upper Aptian material or display pieces that can support a focused fossil and geological collection. The large scale also gives it strong visual presence when displayed alongside other ammonites, minerals or natural history specimens.
Collection and Display
From the Alice Purnell Collection
The specimen is suitable for a private fossil collection, educational display, palaeontology-themed office, study, library or museum-style cabinet. Its named identification and Upper Aptian designation provide useful discussion points for anyone interested in ammonite evolution, Cretaceous geology and the classification of fossil cephalopods. The generous 9.5-inch scale makes it easy to appreciate as a standalone display specimen, while the macroconch identification adds specialist collector interest.
Sizing and Photography
Full sizing is shown in the photographs.
The photograph shows the actual specimen you will receive.
Please review the photographs carefully for the specimen’s overall form, preservation and presentation. The images are provided to show the exact fossil included with this listing and to help assess its scale for display planning.
Certificate of Authenticity
This Fossil is a genuine specimen and Includes a fully hand-signed Premium Certificate of Authenticity.
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