A superb fossil Ammonite group, once part of the fossil bed in the Atlas mountain range of North Africa, now painstakingly cleaned and conserved to a high standard, the three extinct cephalopod shells juxtaposed to each other. The large size and exceptionally good form of the three specimens make the fossil assemblage of a superior echelon quality. The ornate ribbing of the uncoiled heteromorph ammonites contrasts with the compact spirally coiled whorls of the shell of the single evolute ammonite. This arrangement of the spiral shell is termed 'serpenticone'.
The shell of the fossil ammonite is referred to as the phragmacone, as is the modern day shell of the Nautilus. The ammonite shell in this specimen is evolute, whereas nautili have involute phragmacone's. The umbilicus is basically the central part of the whorl of the shell, in evolute shells the umbilicus is open, appearing more flat, enabling the inner whorls to be clearly seen. In involute shells occurring in nautili and several ammonite varieties, the umbilicus is much smaller diameter or narrower and constricts the inner whorls.
The uncoiling heteromorph (this particular variety colloquially known as the 'walking stick' ammonite) ammonites are prevalent in the Cretaceous, close in geological terms to the mass extinction of ammonites at the end of the Cretaceous period. A fascinating collection piece, of this quality, rarely seen.
Emericiceras barremense and two single Ancyloceras heteromorph fossil ammonites, excavated in Agadir Morocco from the renowned Atlas Mountain Range. Now conserved and prepared to display as a dynamic fossil cephalopod centrepiece, the Emericiceras shows exquisite detail, with the definitive contrast between each rib of this once living cephalopod some 125,000,000 years ago.