Which of the following geologic observations would bear directly on working out the sequence of geologic events in an area? an unconformity between a granite and a sandstone grain size comparison between sandstone and shale mineral analysis of schist the feldspar and quartz contents of a granite mount hood (pictured) is part of the cascade range. these active volcanoes are a chain that stretches along the west coast from northern california to southern british columbia, canada. the cascades are