Description
A scarce and scientifically valuable ammonite fossil of the species Grammoceras penestriatulum, collected from the Toarcian Stage of the Early Jurassic Period, and hailing from the Rhône region in France. This well-preserved fossil originates from the renowned Alice Purnell Collection, a curated assortment of distinctive and scientifically meaningful fossil specimens.
Grammoceras is a genus within the Hildoceratidae family, notable for its planispiral shell and dense ribbing pattern. G. penestriatulum is particularly known for its fine, regular ribs and compressed whorl section, which make it a key taxon for identifying stratigraphic zones in Toarcian sequences.
Geological & Scientific Details:
- Scientific Name: Grammoceras penestriatulum
- Fossil Type: Ammonite
- Geological Period: Early Jurassic
- Geological Stage: Toarcian (~182–174 million years ago)
- Location Found: Rhône, France
- Order: Ammonitida
- Superfamily: Hildoceratoidea
- Family: Hildoceratidae
- Morphological Features: Involute shell, finely ribbed with narrow whorls, compressed profile, well-defined umbilical margin
- Depositional Environment: Marine shelf setting with oxygenated bottom waters, often calcareous mudstone or marl beds
- Biozone Significance: Utilised in biostratigraphy of the Toarcian for ammonite zonal correlation
This fossil is a choice specimen for both collectors and researchers, especially those interested in ammonite evolution and Early Jurassic stratigraphy.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
Please Note:
- Scale Rule Squares / Cube = 1cm – refer to photos for precise measurements
- The specimen depicted is the exact one you will receive
- From the historic Alice Purnell Collection – an exceptional piece for collectors or educational institutions
A rare and scientifically significant ammonite fossil, ideal for academic reference, fossil collection enhancement, or curated display.
Reviews
There are no reviews yet.