Ammonite (Lopez de Bertodano Formation, Upper Cretaceous, 69 Ma; Seymour Island, Antarctica) 3

Ammonite from the Cretaceous of Antarctica. (OSU 24888, Orton Geology Museum, Ohio State University, Columbus, Ohio, USA)

Ammonites are common and conspicuous fossils in Mesozoic marine sedimentary rocks. Ammonites are an extinct group of cephalopods - they’re basically squids in coiled shells. The living chambered nautilus also has a squid-in-a-coiled-shell body plan, but ammonites are a different group.

Ammonites get their name from the coiled shell shape being reminiscent of a ram’s horn. The ancient Egyptian god Amun (“Ammon” in Greek) was often depicted with a ram’s head & horns. Pliny’s Natural History, book 37, written in the 70s A.D., refers to these fossils as “Hammonis cornu” (the horn of Ammon), and mentions that people living in northeastern Africa perceived them as sacred. Pliny also indicates that ammonites were often pyritized.

The ammonite seen here is from the Cretaceous of Seymour Island, offshore from the Antarctic Peninsula. The island has been described as a "pile of dirt and fossils".

Classification: Animalia, Mollusca, Cephalopoda, Ammonoidea, Ammonitina

Stratigraphy: Lopez de Bertodano Formation, Maastrichtian Stage, Upper Cretaceous, 69 Ma

Locality: Seymour Island, east of the northern Antarctic Peninsula, northwestern Weddell Sea
(www.geologicallocations.com/antarctica/seymour-island.htm)

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Taken on: April 6, 2024

Tags:

ammonite

ammonites

cephalopods

ammonoid

ammonoids

fossil

fossils

Lopez

Bertodano

Formation

Cretaceous

Seymour

Island

Antarctica

Maastrichtian

Stage « less

Sets appears in: • Antarctica Rocks & Fossils & Natural Features • Cretaceous Rocks, Minerals, Fossils more » • Cephalopods (fossil & modern) • Fluorescent & phosphorescent & tenebrescent rocks, minerals, and fossils • Ammonite & Ammonoid Fossils « less

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