The reaction essay to the National Geographic Tsunami video was due at the start of today’s class. We briefly discussed their reaction to the video before moving on to today’s topic: relative aging puzzles.

We began by finishing up the guided notes on relative aging that we had started back on Thursday of last week. Today’s focus was on unconformities: ways in which rock layers can get partially or completely eliminated from the geologic column. These include the disconformity, erosional surface, and angular unconformity. After diagramming each of these, students were introduced to the relative aging puzzles: describing a series of events in chronological order based on a diagram of rock layers and their irregularities. Students worked to complete the practice problem set before tackling the Relative Aging Puzzles: The Big One. This puzzle is due tomorrow at the start of class.

Homework: Complete “The Big One” relative aging puzzle - due at the start of tomorrow’s class.

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