Description
Tissotia tissotia Ammonite Fossil – Santonian Upper Cretaceous, Abu Roash, Egypt
This genuine Tissotia tissotia ammonite fossil is a collectable Upper Cretaceous marine cephalopod specimen from Abu Roash, Giza Governorate, Egypt. Dating from the Santonian Stage of the Late Cretaceous, approximately 86 to 83 million years old, this fossil represents an ancient ammonite from the warm marine environments that once covered parts of North Africa and the southern margin of the Tethys Ocean.
This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. It has been carefully chosen as an individual fossil specimen, with a photo that shows the actual piece you will receive. Full sizing please see photo.
Geology and Geological Age
Tissotia tissotia comes from the Santonian Stage of the Upper Cretaceous Period, a time when sea levels were high and shallow marine conditions extended across large regions of present-day Egypt. The Abu Roash area, west of Cairo in the Giza Governorate, is well known for its Cretaceous sedimentary rocks and fossil-bearing beds, including limestone, marl and other marine deposits.
During the Santonian, the Abu Roash region lay within a warm subtropical marine setting connected to the ancient Tethys Ocean. These seas supported a diverse range of marine life, including ammonites, bivalves, gastropods, echinoids, fish, sharks and other invertebrates. Ammonites such as Tissotia were active swimming cephalopods, related to modern squid, octopus and cuttlefish, but with a coiled external shell divided internally into chambers.
Fossil Type and Species
This specimen belongs to the ammonite species Tissotia tissotia, a distinctive Late Cretaceous ammonite associated with North African marine deposits. Tissotia is a recognised Cretaceous ammonite genus within the order Ammonitida, a major group of ammonoids that became highly successful throughout the Mesozoic Era.
Ammonites are especially important fossils because many species evolved quickly and had wide geographic distributions, making them useful for comparing and dating marine rock layers. Tissotia ammonites are characteristic of Upper Cretaceous Tethyan faunas and are valued by collectors for their attractive shell shape, geological importance and connection to ancient marine ecosystems.
Morphology and Collectable Features
Tissotia ammonites are generally known for their robust, compact shell form and distinctive Late Cretaceous appearance. Depending on preservation and growth stage, specimens may display an involute coiling style, defined whorl shape, compressed to rounded shell profile, subtle ribbing, nodes, tubercles or visible shell contours. These features reflect the structure of the original ammonite shell and help make each fossil specimen visually unique.
The original living animal occupied the outer body chamber of the shell, while the inner chambers helped regulate buoyancy. As the ammonite grew, it added new chambers to the shell, leaving behind a natural record of growth. In well-preserved examples, sutures may be visible as complex lines marking where the internal chamber walls met the outer shell.
This fossil is suitable for collectors interested in Cretaceous ammonites, Egyptian fossils, North African palaeontology, marine cephalopods and natural history display pieces.
Depositional Environment
This Tissotia tissotia ammonite was preserved in sediments laid down beneath an ancient Cretaceous sea. The depositional environment around Abu Roash would have included carbonate-rich marine muds, shell debris and fine sediment accumulating on the sea floor. After the ammonite died, its shell settled into the sediment and was gradually buried.
Over millions of years, mineral-rich groundwater moved through the surrounding rock, allowing the shell to fossilise. The result is a natural fossil specimen that records an animal from the Santonian seas of Egypt, long before the end-Cretaceous extinction event that brought ammonites to an end.
Abu Roash, Egypt Fossil Locality
Abu Roash is an important Egyptian geological area known for its Cretaceous exposures and fossiliferous marine strata. Fossils from this region help show the richness of ancient marine life along the North African edge of the Tethys Ocean. The area is particularly interesting to collectors because it links Egyptian geology with the wider Late Cretaceous marine faunas found across North Africa and the Middle East.
A Tissotia tissotia ammonite from Abu Roash is a desirable addition to a fossil collection because it combines a recognised ammonite genus, a clear Santonian age and a classic North African Cretaceous locality. It is ideal for display cabinets, fossil study collections, educational use, geology teaching, natural history displays or as a thoughtful gift for a fossil enthusiast.
Authenticity and Display
This is a genuine Tissotia tissotia ammonite fossil from the Santonian, Upper Cretaceous of Abu Roash, Giza Governorate, Egypt. It includes a Certificate of Authenticity lifetime guarantee generic card. The fossil has been carefully selected, and the photo shows the actual specimen you will receive. Full sizing please see photo.
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