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| Geological photographs from around the world | ||||||||
Graptolites
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Graptolites are named after the marks they leave on bedding planes - an early, natural form of graffiti.
The delicate skeletons of these marine invertebrates formed an 'apartment block' for a colony of tiny, individual
animals, probably interconnected by some sort of nervous system.
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Dendroid graptolites are found in rocks of Cambrian to Carboniferous age.
Graptoloid graptolites (see photograph) are restricted to the Ordovician and Silurian.
- gives an illustrated description of graptolites;
- describes the main morphological features;
- explains how the mode of life can be determined;
- shows how graptolites can be used for correlation.
The Study Guide contains the following pages:
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