Churkin, Michael, Jr.; Carter, Claire; Johnson, Bruce R. (1977): A new Ordovician time scale based on accumulation rates of graptolite shale. U. S. Geological Survey, Reston, VA, United States, U. S. Geological Survey Circular, C 0751-B, B4-B5, georefid:1987-008118

Coverage:
West: 173.0000 East: -130.0000 North: 72.0000 South: 51.0000
West: NaN East: NaN North: NaN South: NaN
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=1987-008118 (c.f. for more detailed metadata)
This metadata in ISO19139 XML format