Disconformities

Lost & Found

How Do We Recover Lost Bits of Rock Record...(challenge)

Objectives:

• I can demonstrate my understanding of how the age of Earth was determined by analyzing rock formations using correlation techniques

• I can restore geologic columns by applying correlation techniques

Fill in the Blanks

Assume that the outcrops 1&2 were meant to be identical. Wavy lines are UNCONFORMITIES, indicating missing layers of rock. Letters represent INDEX FOSSILS. Correlate the outcrops and restore the sequence from OLDEST to YOUNGEST layer.

Fill in the Blanks

Why is the layer with index fossil T missing in outcrop 1?

Fill in the Blanks

Correlate these 4 outcrops using INDEX FOSSILS (shown as letters). Uneven wavy lines between layers indicate UNCONFORMITIES (sections of rock that were eroded in the past and are now missing from the columns.) List index fossils in order, from OLDEST to YOUNGEST. Correctly restored sequence will reveal to you a secret message!!!!😉