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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 ?
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.
Conodonts also exhibit a broader distribution than Permian ammonoids because they are the only stratigraphically important Permian fossil group that is little affected by provincialism.
A contribution to the knowledge of Upper Devonian ammonoids from the Holy Cross Mts.
1988) cites a single specimen of ammonoid from the early Kimmeridgian (Cymodoce zone) in the lowest part of the unit.
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.
A measure of the average depth of nesting of curves within curves is the fractal dimension; Figure 6 shows that mean and maximum fractal dimension increased initially, over about the first half of ammonoid history, but later the mean decreased slightly and the maximum leveled off.
2014) review the stratigraphic distribution of the Hauterivian-Albian ammonoid species in the Maestrat Basin (E Spain), providing an updated and comprehensive biostratigraphic framework as a reference for the analysis of the Lower Cretaceous strata of the Maestrat Basin.
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).
It is fortunate that this floor was covered in limestone and not the marble that is present as a facade in other portions of the shopping complex, because the metamorphism associated with the marble might have skewed the measurements of the ammonoid shell geometry or destroyed the fossils entirely.
Septal complexity in ammonoid cephalopods increased mechanical risk and limited depth.
There are many works, meeting abstracts, and doctoral theses that are focused on and/or contain data of this ammonoid record.