ammonite

noun 0.625

trilobite

noun 0.566

nautiloid

noun 0.552

beryllium

noun 0.529

oolite

noun 0.527

brachiopod

noun 0.520

graptolite

noun 0.518

foraminiferan

noun 0.518

foraminifer

noun 0.517

stilbite

noun 0.510

ankerite

noun 0.509

bronzite

noun 0.506

lancelet

noun 0.504

cephalopod

noun 0.503

phragmocone

noun 0.502

amphibole

noun 0.502

microbialite

noun 0.501