"Phyllograptus " species are excellent index fossils or guide fossils for identifying Ordovician rocks.
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Guided fossil-hunting treks allow ordinary folks to become amateur paleontologists
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Index fossils ( also known as guide fossils, indicator fossils or zone fossils ) are fossils used to define and identify geologic periods ( or faunal stages ).
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Fossil fans can dig it : See what you can dig up when you join this hands-on, guided fossil expedition through Old Topanga Canyon at 9 a . m . Saturday.
परिभाषा
a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found पर्याय: index fossil,
मोबाइल