a) What is the most common mineral in carbonates? What are the sources of gamma radiation in carbonates? b) What are the most common mineral in sandstones? What are the sources of gamma radiation in sandstones? c) Rank carbonate, sandstone, and shale according to gamma activity. d) Plot the gamma log and caliper log of Locreta-1. Identify intervals where the hole is in gauge with bit-size, and intervals where it is not. Identify the lithology of these intervals..