def geometry_column_name(df):
    """Get geometry column name, fall back to 'geometry'

    Args:
        df (pandas.DataFrame): [description]

    Returns:
        geom_col (string): [description]
    """    
    try:
        geom_col = df.geometry.name
    except AttributeError:
        geom_col = 'geometry'
    return geom_col