The fossil in the image appears to be a cross-section of an ammonite. Ammonites are a group of extinct marine mollusks within the class Cephalopoda, related to modern squids, octopuses, and nautiluses. The distinctive spiral shell with internal chambers is a key characteristic of ammonites. The chambers are divided by septa, which are the walls you see in the fossil, and the intricate patterns are typical of the internal structure of ammonite shells.

Based on the image, the fossil appears to be a trilobite. Trilobites are a group of extinct marine arachnomorph arthropods that form the class Trilobita. They are one of the earliest-known groups of arthropods, with their first appearance in the fossil record defining the base of the Atdabanian stage of the Early Cambrian period. The segmented structure and the overall shape in the image are characteristic of trilobite fossils.

This rock appears to have a pattern and texture that is characteristic of fossiliferous limestone. Fossiliferous limestone is a type of sedimentary rock that contains visible fossils, often marine organisms like shells or coral. The dark coloration with lighter inclusions suggests the presence of fossilized remains within the limestone matrix.

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