Description: This is an SDE feature class representing the bedrock geology of Michigan. The file was created from a feature class originally created in ArcMAP. The data for the feature class was chiefly drawn from the 1987 Bedrock Geology map of Michigan. The polygons in the file show the formations that make up the bedrock of Michigan. The SDE feature class covers only the Upper and Lower peninsulas of Michigan. There is no symbology differentiating the various formations included in the file. For symbology layer see the "Supplemental Information" box below.