rugosa

noun 0.584

radiolarian

noun 0.569

radiolarite

noun 0.567

restis

noun 0.562

rhodolith

noun 0.562

rud

noun 0.551

rugosity

noun 0.548

bryozoan

noun 0.524

serpulid

noun 0.522

stony coral

noun 0.522

ruddy

noun 0.520

rudd

noun 0.520

rudy

noun 0.515

crinoid

noun 0.507

ragstone

noun 0.507

rutherford

noun 0.507

brachiopod

noun 0.506

coralline

noun 0.504

preterist

noun 0.504

rust fungus

noun 0.503

rendzina

noun 0.502

bioherm

noun 0.501