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2" Fossil Nautilus (Eutrephoceras) - South Dakota
This is a beautiful, 2" wide fossil Nautilus (Eutrephoceras dekayi) from the Pierre Shale of South Dakota. It has been prepared free of the hard concretion it was found in.
About Nautilus Fossils
autilus is a classic shelled cephalopod with a fossil history spanning more than 500 million years. Fossil nautilus shells are instantly recognizable by their tightly coiled, chambered structure, created as the animal grew and adjusted buoyancy using a central siphuncle. These fossils often preserve beautiful suture patterns, internal chambers, and sometimes even traces of original nacre. Found in marine deposits worldwide and frequently mineralized with calcite or chalcedony, fossil Nautilus specimens provide a striking glimpse into ancient seas and showcase one of the most enduring designs in natural history.
autilus is a classic shelled cephalopod with a fossil history spanning more than 500 million years. Fossil nautilus shells are instantly recognizable by their tightly coiled, chambered structure, created as the animal grew and adjusted buoyancy using a central siphuncle. These fossils often preserve beautiful suture patterns, internal chambers, and sometimes even traces of original nacre. Found in marine deposits worldwide and frequently mineralized with calcite or chalcedony, fossil Nautilus specimens provide a striking glimpse into ancient seas and showcase one of the most enduring designs in natural history.
SPECIES
Eutrephoceras dekayi
LOCATION
Meade County, South Dakota
FORMATION
Pierre Shale
SIZE
2" wide
CATEGORY
SUB CATEGORY
ITEM
#162638
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