phragmacones

the fossil showed well-preserved phragmacones.

phragmacones are important for dating geological strata.

scientists examine phragmacones to understand mollusk evolution.

the museum's collection includes several phragmacones specimens.

phragmacones can indicate the age of sedimentary rocks.

researchers compare phragmacones from different locations.

the phragmacones displayed remarkable symmetry.

some species have spiral-shaped phragmacones.

the phragmacones were found embedded in limestone.

paleontologists use phragmacones as taxonomic markers.

the phragmacones showed signs of natural erosion.