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Baculite, Section of a Straight Ammonite (No.92)
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Baculite, Section of a Straight Ammonite (No.92)Baculite, Section of a Straight Ammonite
100 Million Years, Cretaceous Period

Measurements Approx.
Height - 2.7 cm
Width - 1.8 cm
Length - 3.4 cm



In this Late Cretaceous genus, only the very earliest part of the shell remained coiled; the latter part grew into a straight shaft. Baculites can occur in vast numbers at some localities, often to the virtual exclusion of the other species, and could grow to over a metre in length.

  

The mode of life of these straight ammonites is controversial: some palaeontologists believe that they lived upright in the water, with the tentacles on the sea bed foraging for food; others that they had horizontal orientation and lived nearer the surface of the sea.





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