Geologists identified a distinctive marker horizon across the basin that allowed them to correlate sedimentary layers over hundreds of kilometers.

The geologists identified several marker horizons that helped date the volcanic ash layers.

Linguistics students studied how infinitive markers affect verb forms across different languages.

By analyzing genetic markers, scientists can identify population structures and migration patterns.

The children used Magic Markers to decorate the cardboard castle for the school play.

Geologists use marker beds to correlate rock sequences across wide regions.

Researchers used marker genes to distinguish different cell types in the tissue sample.

The logistics manager reviewed the on-time markers to ensure shipments arrived when scheduled.

I labeled the boxes with permanent markers to ensure the writing wouldn't smudge.

I used a marker pen to label the storage boxes so I'd know which one had the holiday decorations.