When datatype_spec is used in a control file entry, it may use the following syntax:

INTEGER [EXTERNAL [(length)] [delimiter_spec]]
FLOAT [EXTERNAL [(length)] [delimiter_spec]
ZONED {(precision[,scale]) | EXTERNAL [(length)] [delimiter_spec]}
DECIMAL {(precision[,scale]) | EXTERNAL [(length)] [delimiter_spec]}
DOUBLE
SMALLINT
BYEINT
RAW [(length)]
GRAPHIC [EXTERNAL] [(length)]
VARGRAPHIC [(maximum_length)]
VARCHAR [(maximum_length)]
CHAR [(length)] [delimiter_spec]
DATE [(length)] ["mask"] [delimiter_spec]

The Oracle Server Utility User’s Guide contains a full syntax description.