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Related to ammonoid: ammonite, Ammonoidea
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  • noun

Synonyms for ammonoid

one of the coiled chambered fossil shells of extinct mollusks


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References in periodicals archive ?
Furnish, W.M., Glenister, B.F., 1970.Permian ammonoids Cyclobus from the Salt Range, West Pakistan.
London, December 22 ( ANI ): Marine animal groups like ammonoids and conodonts already peaked three or four million years earlier, namely still during the Ear-ly Triassic, researchers say.
However, due to a small sample size, poor or even erroneous stratigraphic control, as well as inadequate identification of the previous collections, the previous studies failed to establish well-defined levels of ammonoid genera or assemblages.
Analysis of heteromorph ammonoids by differential geometry.
A contribution to the knowledge of Upper Devonian ammonoids from the Holy Cross Mts.
Based on the scarce ammonoids found in the middle part of the formation, Dubar and Mouterde (1957) and Suarez-Vega (1974) specify a late Kimmeridgian age (Eudoxus zone), and Ramirez del Pozo (1969) assigns an early Portlandian age to the upper part of the Lastres Fm.
(2) One of the chambers of the ammonoid was used as a living space and the rest were used to regulate buoyancy, just like in a submarine.
Tim retired in 1995, but not before completing a monumental work, Canadian Triassic Ammonoid Faunas (Tozer, 1994), at 663 pages with 148 plates the largest paleonto-logical treatise ever published by the GSC.
However, in Mesozoic ammonoids a combination of pronounced sculpture and colour bands is relatively common (Mapes & Davis 1996).
American Association of Petroleum Geologists Memoir, 108-121.Fatmi, A.N., Hyderi, I.H., Anwar, M., 1990.Occurrence of the Lower Jurassic Ammonoid Genus Bouleiceras from the Surghar Range with a revised nomenclature of the Mesozoic rocks of the Salt Range and Trans Indus Ranges (Upper Indus Basin).
Ammonoid shell streamlining was studied by Kummel and Lloyd (1955) using a circulating water channel and plaster models of ammonoid shells.
Septal complexity in ammonoid cephalopods increased mechanical risk and limited depth.
In the present work, we update and review the biostragraphic ammonoid knowledge of this basin following the latest version of the standard Mediterranean ammonite zonation (Reboulet et al, 2011).
More recent palaeontological studies in the RGCHSP section describe ammonoid biostratigraphy (Oloriz et al.,, 1999), taphonomy of the foraminifera and macroinvertebrate assemblages (Oloriz et al., 2002; 2003b; Reolid, 2008) and composition of foraminiferal assemblages (Oloriz et al., 2003a).