DBA_EXP_OBJECTS describes objects that have been incrementally exported.

Column Datatype NULL Description
OWNER VARCHAR2(30) NOT NULL Owner of exported object
OBJECT_NAME VARCHAR2(30) NOT NULL Name of exported object
OBJECT_TYPE VARCHAR2(12)   Type of exported object
CUMULATIVE DATE   Timestamp of last cumulative export
INCREMENTAL DATE NOT NULL Timestamp of last incremental export
EXPORT_VERSION NUMBER(3) NOT NULL The ID of the export session