1. Since bedrock is not a specific type of rock, such as granite or sandstone, what is it?

2. Why, in many areas, are bedrock outcrops rare?

3. What is the difference between 'surficial geology' and 'bedrock geology'?

4. In what sense is a geologic map a 'hypothesis'?

5. Examine the geologic map shown below. The small rectangles represent outcrops of bedrock. The bedrock consists of four formations, labeled 1, 2, 3 and 4. Outside of the rectangles, the bedrock is covered and cannot be seen. On the map, draw inferred contacts to show what the outcrop pattern would look like if bedrock were exposed everywhere. Assume that each of the individual formations maintains a more or less constant thickness throughout the region. Make the pattern of inferred contacts as simple as possible while remaining consistent with the actual outcrops.

David J. Leveson