Graptolite sentence example

graptolite
  • A typical graptolite consists of an axis bearing a series of tooth-like projections, like a saw.
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  • The subdivisions of the system may be grouped as follows: (I) Ceratopyge Limestone; (2) Lower Graptolite Shales and Orthoceras Limestone; (3) Middle Graptolite Shales, Chasmops and other Limestones, Trinucleus beds.
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  • The Silurian has in Sweden almost the same character as the Wenlock and Ludlow formation of England and consists partly of graptolite shales, partly of limestones and sandstones.
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  • The Graptolite polyparies vary considerably in size: the majority range from i in.
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  • It is the general practice of palaeontologists to regard each graptolite polypary (rhabdosome) developed from a single sicula as an individual of the highest order.
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  • Many Graptolite zones, showing a constant uniformity of succession, paralleled in this respect only by the longer known Ammonite zones of the Jurassic, have been distinguished in Britain and northern Europe, each marked by a characteristic species.
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  • Graptolite Island now has a giant rookery - mainly Adelie Penguins.
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