different between graptolite vs graptolitic

English

From Ancient Greek ??????? (graptós, “painted, marked with letters”) +? -lite.

graptolite (plural graptolites)

Any of a group of extinct aquatic colonial invertebrates, of the class Graptolithina, from the Cambrian and Carboniferous periods.
- 2004, Richard Fortey, The Earth, Folio Society 2011, p. 70:
  The samples were black shale, and on the shales were some ancient fossils called graptolites.

graptolite +? -ic

graptolitic (comparative more graptolitic, superlative most graptolitic)

Of or pertaining to graptolites; containing graptolites.
a graptolitic slate

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