def METHOD_NAME(self):
    """
    Check if there are lithologies in the data and/or df. This method in gempy v2 is simply informative
    Returns:
        :class:`pn.DataFrame`: df where Structural data is stored
    """
    self.df['isLith'] = True if self.df.loc['values', 'number series'] >= self.df.loc['values', 'number faults'] \
        else False
    self.df['isFault'] = True if self.df.loc['values', 'number faults'] > 0 else False
    return self.df