X = present or necessary for preservation (i.e., absence = candidate for deaccession).
x = may be present and may be a factor for preservation (i.e., absence may not be a factor for deaccession).
_ = not present and not necessary for preservation (i.e., absence is not a factor in deaccession).
Criteria are arranged from left to right in approximately decreasing order of importance (but see text for further explanation and elaboration).
Collections are arranged alphabetically.
aIncludes drill stem tests, completion records, site reports, and other engineering data/reports on CD, computer disk, fiche, paper, tape, or some other quasi-stable medium.
bIncludes seismic data, down-hole geophysical data, fly-over geophysical data, and other geophysical data on CD, computer disk, fiche, paper, tape, or some other quasi-stable medium.
cIncludes unpublished materials on CD, computer disk, fiche, paper, tape, or some other quasi-stable medium, whether or not they were used in the production of published products.
dAll collections must be well documented before any other assessment of their utility and future can be done. Indeed, whether or not a rock, fossil, core, or other item is replaceable or not is completely unknown in the absence adequate documentation to assess uniqueness. That said, if part of a collection is not replaceable, but only documented well enough to know that it is unique, it probably should be kept anyway. Documentation includes, but is not limited to, information about age, location, depth, collector or author, date acquired, and associated materials.
eImpossible or highly unlikely to collect a similar sample (e.g., a mine core from a completely mined-out locality; a sample from a politically inaccessible part of the world; a sample requiring great time and effort to recollect such as a deep ice core from Antarctica or Greenland).
fThis category in particular should be weighed judiciously by a science advisory board comprised of members of the user community.