Nautili |
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Nautili
occur fairly frequently on Sheppey. Of the six species found on the
island only Cimomia imperialis can be described as common. |
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Nautilus
Cimomia imperialis collected in situ from nodule band 'G' |
Unusually
preserved A. ziczac (mature Female?) |
Cimomia
imperialis (J. Sowerby) is the largest and the most common nautilus
found on Sheppey. The diameter is slightly more than the width with
a gently curving edge profile. S shaped septa with a deep open umbilicus.
Central siphuncle. |
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C.
imperialis Section showing internal structure |
C.
imperialis showing crushed centrum |
Aturia
ziczac preserved in pyrite - This is the usually how this species
is found in the pyrite accumulations. Normally no larger than 80mm,
narrow in section with an exagerated S-shaped curve. Open umbilicus. |
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Simplicioceras
centrale - Normally no larger than 80mm diameter. Round in section
with staight septa. Open umbilicus |
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Euciphoceras
regale Larger than S. centale which also has staight septa.
It is narrow in profile with a gently curving profile. Septa are staight
and the umbilicus is closed. A calcite plug covers the central hole. |
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Deltoidonautilus cassinianus (above) found by Danny Hogben on the beach near to Barrows brook. This is an exceptionally well preserved middle of a once larger specimen clearly showing the S shaped sutures typical of this species. | |
Deltoidonautilus
cassinianus found by thomas Harrison. Diameter up to 120mm
and quite narrow with S-shaped septa. (not as severe as A. ziczac
) Open umbilicus |
Two
small specimens of Deltoidonautilus cassinianus |
Deltoidonautilus
sowerbyi - middle of a much larger specimen which had collapsed
the outer chambers Diameter about 150mm upwards. Narrower in width than
C. imperialis with a sharply curved edge profile. S shaped septa
with an open umbilicus and a central siphuncle. |
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