Boring fossils

thumb|Entobia borings on the fossil shell of the bivalve "Pelecyora gigas" (Lamarck, 1818), Pliocene of Tuscany, Italy, (Natural History Museum University of Pisa)

thumb|Trypanites borings in an Upper Ordovician hardground from northern Kentucky. thumb|Trypanites borings in an Upper Ordovician hardground from northern Kentucky. The borings are filled with diagenetic dolomite (yellowish). Note that the boring on the far right cuts through a shell in the matrix. thumb|Polished section of the Upper Ordovician bryozoan Amplexopora with clusters of Trypanites borings; northern Kentucky.