To cite package 'astrochron' in publications use:

Meyers, S.R. (2014). astrochron: An R Package for Astrochronology (Version 0.3.1). Available from http://www.geology.wisc.edu/~smeyers

Corresponding BibTeX entry:

  @Manual{,
    title = {astrochron: An R Package for Astrochronology},
    author = {Stephen R. Meyers},
    year = {2014},
    note = {(Version 0.3.1)},
    url = {http://www.geology.wisc.edu/~smeyers},
  }