Graptolitter er utdødde, små kolonidannende dyr som levde fra kambrium- til devontiden.
Fossilene ser ut som enkle eller doble, rette eller sammenrullede løvsagblad; i hver tagg satt det ett dyr. De er gode ledefossiler; blant annet i skifre fra ordovicium- og silurtiden i Oslofeltet.
Kilder
- Bulman, 1970. In Teichert, C. (ed.). Treatise on Invertebrate Paleontology. Part V. Graptolithina, with sections on Enteropneusta and Pterobranchia. (2nd Edition). Geological Society of America and University of Kansas Press, Boulder, Colorado and Lawrence, Kansas, xxxii + 163 pp.
Eksterne lenker
- Graptolite Net – Graptolite.net
- Klassifikasjon av Cephalodiscoidea (Graptolithoidea) – Graptolite.net – Cephalodiscus
- BIG G – The British & Irish Graptolite Group – British and Irish Graptolite Group (BIG-G)
- Graptolittforekomster – The palaeoecology and palaeoenvironment of graptolitic mudrocks[død lenke]
- Written by Josh Caplan for Professor Bill Chaisson's Invertebrate Paleontology course in December 2000.
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