LacCore has operated the National Lacustrine Core Repository since 2000, and now curates the world's largest and most diverse collection of lacustrine sediment cores. The biggest contributors (by core volume) are drilling projects, but small-volume projects outnumber the drilling campaigns by a factor of nearly 50. The vast majority of the curated materials are moist, cylindrical cores split in half, but unsplit cores, grab samples, dry cores, and a rapidly-growing number of rock cores, peat cores, freeze cores and permafrost cores round out the collection. The Repository also curates unused subsamples and sample residues for re-distribution and analysis. In addition to these physical holdings, LacCore captures metadata for all materials moving through the Facility; thus cores processed at LacCore but stored at other institutions are integrated among the physical holdings for the purpose of data discovery.
Metadata for the entire (physical and virtual) collection are made available for discovery through multiple means. Online tables with a selection of metadata and equivalent spreadsheet files for download are regularly updated on the LacCore website, and from these a .kml file is generated that allows geographical views and searches through the holdings with Google Earth software. LacCore also continues the process of transferring both project metadata and data generated at the Facility (core images, multisensor logs, core description sheets) to the National Geophysical Data Center (NGDC) Index to Marine and Lacustrine Geological Samples, an online database and permanent virtual archive of sea floor and lakebed samples sponsored by NGDC and NSF to help researchers locate existing samples.
The LacCore core collection is available in numerous different formats: CSV, KML and plain old text searchable in any browser.