Janus

Information from Janus conducted under the Deep Sea Drilling Project (DSDP), Ocean Drilling Program (ODP) and Integrated Ocean Drilling Program (IODP) efforts.

Explore Janus

An index of all slices in the Janus graph

Samples

Slices associated with samples. From this index you can request all the samples from a given expedition.

Example

Example slice resource page with links to other associated resources. From there you can navigate to other slices and related information

About

Ocean drilling samples are recovered in cores, long tubes of material collected while drilling beneath the sea floor. Specific terminology is used to precisely describe the location of a sample taken in a core.

  • Leg, Expedition – During the history of ocean drilling, the science has been carried out in segments called legs during DSDP and ODP and expeditions during IODP.
  • Site, Hole – A site is a location at which drilling is conducted. Drill sites are numbered consecutively starting with the first drilled by the Glomar Challenger in 1968. If more than one hole is drilled at a site, each hole receives a different letter suffix (A, B, C, etc).
  • Core – Each cored interval is usually 9.5 to 9.6 meters and 6 cm in diameter.
  • Section – A core is cut into sections 1.5 meters long, numbered from the top of the core.
  • Interval – A sample from a core is designated by distance in centimeters from the top of the section to the top and bottom of the sample removed.

A sample identification number includes: leg, site, hole, core number, core type, section number, and interval in centimeters measured from the top of section. For example, “210-1276A-3R-3, 80–85 cm” is a sample from the interval 80 to 85 cm below the top of Section 3, Core 3R of Hole 1276A during Leg 210. All ODP core identifiers indicate core type (R = rotary core barrel, H = advanced piston corer, X = extended core barrel, and W = wash core).

Cored intervals can also be described in meters below sea floor (mbsf). The mbsf depth of a sample is determined by adding the depth of the sample below the section top and the lengths of all higher sections in the core to the core-top datum measured with the drill string.