Use "graptolite" in a sentence
1. Ampullula appears first in the eobifidus graptolite Biozone in South China, where it possibly originated, and subsequently was also present in …
2. The later (or upper) part is defined by the first appearance of the graptolite Normalograptus persulptus, and the Normalograptus persulptus biozone lasts from then until the end of the Hirnantian.