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Mammites Nodosoides Ammonite 160mm


Regular Price: £242.00

Special Price £197.00

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The shell of Mammites are typically stout, having a slightly square whorl section and flattish to slightly concave venter and can reach a diameter of twenty millimetres as an adult.

Genus: Mammites nodosoides, described by Laube and Bruder in 1887.
Family: Acanthoceratidae, described by De Grossouvre, Circa 1894
SubFamily: Mammitinae, described by Hyatt Circa 1900
Age: Upper Cretaceous Period, Early to late Turonian Stage, 94.3 to 89.3 m.y.a.
Environment/lithology: lithified, concretionary marl, Mammites nodosoides Zone.
Geological Location: N.E. Asfla, Goulmima, Er-rachidia province, Anti Atlas, Morocco.

Mammites Nodosoides dimensions
Width: 11.5 cm
Depth: 6.5 cm
Height: 15.0 cm

Overall block dimensions
Width: 15.5 cm
Depth: 9.8 cm
Height: 16.0 cm

Weight: 1,906 Kg

Reference: W. J. Kennedy, A. S. Gale, D. J. Ward and C. J. Underwood. 2008. Early Turonian ammonites from Goulmima, southern Morocco. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique.

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The specimen mammites ammonite with ornamentation of stumpy tubercles to each side of the shell, the whole form is reasonably good, uncrushed, with some excellent ammonitic suture patterning. In places, the thick fossilised shell is still intact, this appears as darker patches, while the internal sutures under the shell appear in varying dark and lighter beige areas. Verso one small complete turritella gastropod lies within the matrix, just above the cut base, creating a unique and fascinating feature. A collector grade specimen having undergone cleaning and preparation in the UK. The base cut for display and the matrix (bedrock) ground, thus enhancing the overall appearance, lifting the fossilised shell and exhibiting it to a greater degree. Enlarge the illustrations above to fully view the ammonites attributes.

The shell ornamentation is dominated by short stumps, these are umbilical tubercles and were part of the shells defences. Ribs are prominent in juveniles stages but tend to be less prominent in the mature shell of the cephalopod, when fully developed. One may reflect that the need for defence became less important, becoming a large fast moving nektonic carnivore in adulthood, with fewer predators when mature in size.

However there is a debate on whether what appear to be spine placements were for defence or sexual morphism, distinguishing the males and females. The debates will continue as new discoveries may become apparent, particularly from this extensive fossil source in central, southeastern Morocco.

The suture patterning is a simple ammonitic type. These ammonites are from the Early Turonian Stage (Upper Cretaceous) found North of Goulmima, Morocco. Primary reference: W. J. Kennedy, A. S. Gale, D. J. Ward and C. J. Underwood. 2008. Early Turonian ammonites from Goulmima, southern Morocco. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre 78:149-177.

Additional Information

Age Cretaceous
Origin Morocco