A specific type of layer in geosciences or geology, referring to a unique stratigraphic unit identifiable in the rock record.

भूगर्भीय परत

English Usage: The bielby layer was crucial in understanding the geological history of the region.

Hindi Usage: बायलबी परत क्षेत्र के भूगर्भीय इतिहास को समझने में महत्वपूर्ण थी।