Asteroceras obtusum
UNB-2018-0757Fossils » Eukaryote » Animalia » Mollusca » Cephalopoda » Ammonoidea
Description
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Asteroceratidae
Genus: Asteroceras (Hyatt, 1867)
Species: Asteroceras obtusum (Sowerby, 1817)
Two specimens; The largerest specimen is Asteroceras obtusum and the smaller specimen belonging to another genus. Larger specimen is an oxycone shell with four whorls. Visible umbilicus. The outermost whorl is partially missing. Weathered ribs. Orthoceratitic sutures are visible on the outermost whorl. Convex keel. Thin, triangular aperture.
The smaller specimen is a sphaerocone shell with thin curved ribs visible near the aperture. Very faint ammonitic sutures are visible near the umbilicus. This sample is slightly pyritize.
Specifications
| Object name | Asteroceras obtusum |
|---|---|
| ID | UNB-2018-0757 |
| Legal status | Permanent collection |
| Category | Fossil |
| Classification | Domain: Eukaryote Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea |
| Composition | Calcium carbonate, Pyrite |
| Age | Eon: Phanerozoic Era: Mesozoic Period: Triassic to Jurassic Epoch: Upper Triassic to Middle Jurassic Age: Rhaetian to Aalenian |
| Numeric age | 208.5 - 174.1 Mya |
| Origin | Charmouth, Dorset, England, United Kingdom |
| Pieces | 2 |
| Partial | No |
| Measurements |
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