Ammonoidea
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The Ammonoidea constitute a subclass of extinct cephalopods found in marine sediments from the Early Devonian through the Cretaceous (479 65 mya), existing for approximately 414 million years. Baring an external shell, ammonoids superficially resemble nautiloids, such as the modern Nautilus . however, based on similarity of the radulas, they are more closely related to modern coleoids; squid, octopus, and cuttlefish. Ammonoids are commonly referred to in the vernacular as Ammonites, although the term is often reserved for members of the order Ammonitida. For derivation and history of the term see Ammonite. Ammonoid shells usually take the form of planispirals, although there were some helically-spiraled and non-spiraled forms (known as "heteromorphs"). Often with short stratigraphic ranges, they make excellent index fossils, making it possible to link the rock layer in which they are found to specific stage or substage within a given geologic period.
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GarantieWeitere Informationen
- Allgemeine Informationen
- GTIN 09786130268176
- Genre Geowissenschaften
- Editor Frederic P. Miller, Agnes F. Vandome, John McBrewster
- Sprache Englisch
- Anzahl Seiten 156
- Herausgeber Alphascript Publishing
- Größe H220mm x B150mm x T9mm
- Jahr 2009
- EAN 9786130268176
- Format Fachbuch
- ISBN 978-613-0-26817-6
- Titel Ammonoidea
- Untertitel Nautiloid, Nautilus, Coleoidea, Squid, Octopus, Cuttlefish, Radula, Ammonite, Stratigraphy, Index fossil, Geologic time scale, List of ammonites
- Gewicht 250g
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