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When the ArcMap Identify tool is used on layers that are M or Z aware, the Shape field in the Identify Results dialog box does not specify that the identified shapes store M (measure) or Z values.
In ArcGIS, M and Z values are stored in feature geometry. The Shape field value, in several places in ArcMap and ArcCatalog, indicates whether or not a feature class is M or Z aware; for example, Shape = Polygon M. The Shape field in the Identify Results dialog box does not provide this information.
There are two ways to determine if a feature class is M or Z aware: