A layer of rock or soil with internally consistent characteristics that distinguish it from other layers.

A specific type of indicator used in geology to identify and correlate the age of rock layers.

भूगर्भीय सूचक

English Usage: The presence of the particular fossil serves as a stratigraphical indicator for the age of the sediment.

Hindi Usage: विशेष जीवाश्म की उपस्थिति उस अवसाद की उम्र के लिए भूगर्भीय सूचक के रूप में कार्य करती है।