Rare Oncocerid Nautiloid Heteromorph Ammonite - Like Ordovician NY
Item History & Price
| Reference Number: Avaluer:4270034 |
Oncoceras sp. (Open coil nautiloid)Middle OrdovicianBlack River LimestoneJefferson CountyNew York
Very rare and relatively large open coiled nautiloid from the Black River Group Limestones of New York. This specimen could easily be mistaken as a heteromorph ammonite. Early open coiled nautiloids are scarce, especially with an inner coil and 3D mineralization. This specimen is exactly how it was found, prepared by thousands of years of weathering. The innermos...t coil is naturally free standing and segmentation can be seen the calcite on the outer edge of the shell. The nautiloid measures 6cm across and is very inflated, and comprised of 100% calcite. The matrix has a flat, upright standing base and measures 15cm x 10cm. One of a kind specimen.
Will combine shipping
Very rare and relatively large open coiled nautiloid from the Black River Group Limestones of New York. This specimen could easily be mistaken as a heteromorph ammonite. Early open coiled nautiloids are scarce, especially with an inner coil and 3D mineralization. This specimen is exactly how it was found, prepared by thousands of years of weathering. The innermos...t coil is naturally free standing and segmentation can be seen the calcite on the outer edge of the shell. The nautiloid measures 6cm across and is very inflated, and comprised of 100% calcite. The matrix has a flat, upright standing base and measures 15cm x 10cm. One of a kind specimen.
Will combine shipping
