Question

The Mazama ash has been dated at numerous locations in the western US to 6900 years old. This means that if an archaeologist finds the Mazama ash in a stratified context, he or she knows that everything above it is less than 6900 years old, and everything below it is more than 6900 years old. The Mazama ash is an example of a:
a. Colluvial sediment.
b. Soil horizon.
c. Marker bed.
d. Sedimentary deposit that has been disturbed, resulting in reversed stratigraphy.

Answer

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