109mm Authentic Polished Ammonite Fossil, Tulear, Madagascar

🌟 Exquisite Polished Ammonite Fossil from Tulear, Madagascar

This exceptional Polished Ammonite Fossil originates from the fossil-rich beds near Tulear, Madagascar, and represents a fantastic piece of ancient marine life. The specimen has been meticulously cut and polished to reveal the shell's remarkable internal structure, highlighted by the dense, intricate, fern-like patterns known as ammonitic suture lines. These sutures—the edges where the internal chamber walls (septa) meet the outer shell—are beautifully contrasted against the deep, earthy brown and greenish-grey matrix of the fossil. The central whorl retains a rougher texture, providing a tactile contrast to the smooth, polished shell face. This unique piece measures approximately $86\text{mm}$ wide $\times 109\text{mm}$ (to the highest point) and $76\text{mm}$ (to the lowest point of the shell), with a substantial weight of $309\text{grams}$.

Ammonites were an extinct class of marine invertebrate mollusks (subclass Ammonoidea), distant relatives of modern squid, octopuses, and the nautilus. They are characterized by their iconic, tightly coiled, chambered shells, which allowed them to control buoyancy in the ancient oceans. As successful predators, they lived from the Devonian period (starting around $400$ million years ago) and dominated marine ecosystems throughout the entire Mesozoic Era (the Age of Dinosaurs). Their long reign came to an abrupt end during the catastrophic Cretaceous-Paleogene (K-Pg) extinction event about 66 million years ago. Due to their rapid evolution and wide distribution across geological time, Ammonite fossils are indispensable as index fossils, enabling paleontologists and geologists to accurately date the sedimentary rock layers in which they are found, making them crucial markers in the study of Earth's history.

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