def iodp_sample_names(df):
    """
    Convert expedition, hole, section, type, interval to sample name in format:
    exp-hole-type-sect-interval

    Parameters
    ___________
    df : Pandas DataFrame
         dataframe read in from .csv file downloaded from LIMS online database

    Returns
    --------------

    holes : list
           IODP Holes name in format U999A

    specimens : pandas Series
            series with sample names, e.g. 999-U999A-1H-1-W-1


    """
    if 'Top offset (cm)' in df.columns:
        offset_key='Top offset (cm)'
    elif 'Offset (cm)' in df.columns:
        offset_key='Offset (cm)'
    else:
        print ('No offset key found')
        return False,[]
    interval=df[offset_key].astype('float').astype('str')
    holes=df['Site'].astype('str')+df['Hole']
    specimens=df['Exp'].astype('str')+'-'+holes +'-'+df['Core'].astype('str')+df['Type'].astype('str')+\
              '-'+df['Sect'].astype('str')+ '-' + df['A/W']+'-'+ interval
    return holes, specimens