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3.45" Iridescent Nautilus (Eutrephoceras) w/ Baculite - South Dakota
This is a beautiful, iridescent, fossil Nautilus (Eutrephoceras nebrascensis) from the Pierre Shale of South Dakota. It was prepared free of the hard concretion it was found in and was then remounted to it. The nautilus was found in association with one well preserved, partial Baculites ammonite and other smaller partials of the same genus. The base of the rock was cut flat for convenient, aesthetic display.
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.
A picture of a modern day Nautilus.
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.
A picture of a modern day Nautilus.
These 70 million year old ammonites lived when South Dakota was a shallow inland sea. They were found preserved in concretions when split open. They then had to be hand-prepared to remove the hard rock surrounding them from their shells, a very time consuming task.
SPECIES
Eutrephoceras nebrascensis & Baculites sp.
LOCATION
Meade County, South Dakota
FORMATION
Pierre Shale - Baculites compressus/B. cuneatus Zone
SIZE
Nautilus: 3.45" wide, Ammonite: 3.6" long, Entire specimen: 5 x 3.8"
CATEGORY
ITEM
#209678
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