The Lamont-Doherty Core Repository curates and archives a diverse collection of deep sea cores, coral cores, marine dredge samples, terrestrial cores from lakes and wetlands, as well as a number of special collections such as the CLIMAP samples, Prof. Jim Hayes' radiolarian collection, and a collection of cores that have been vacuum-sealed since they were first collected.
You can search the LDCR holdings using three interfaces, through Google Earth, GeoMapApp, or with NGDC.
You can read more about specific collections by scrolling down or following links to left.
Sediment cores from every major ocean and sea are archived in the Core Repository. The collection contains approximately 72,000 meters of core composed of 9,700 piston cores; 7,000 trigger weight cores; and 2,000 other cores such as box, kasten, and large diameter gravity cores. Please note that all core samples from cruises prior to 1968 (VEMA 1-25; CONRAD 1-12) were temporarily stored in galvanized tubes and thus all of this material is seriously contaminated for heavy-metal geochemical studies. Additional contamination may be present for cruises through VEMA 32 and CONRAD 17 from storage in galvanized trays. Also note that all VEMA cores and all CONRAD cores taken prior to cruise 24 are stored dry at room temperature. All cores taken since 1985 are stored wet in D-tubes at 4.5°C (40°F).
Despite the illustrious and productive history of the Lamont-Doherty Core Repository, the core collection is so vast that the majority of its cores still remain largely unexamined. Additionally, many of the best known, most requested cores are now nearly depleted. Amazingly, only 4% of the core collection has adequate carbonate and/or oxygen isotopic stratigraphic data to define glacial-interglacial stratigraphic cycles, although nearly all have a "basal age estimate" based on biostratigraphic analyses of the deepest core level.
The LDCR has recently launched a new initiative aimed at generating preliminary stratigraphic data on selected subsets of cores. Our goal is to identify promising cores in geographic arrays that could be used to track past variations in surface and deep ocean properties---essentially “paleo-GEOSEC” core transects. The expectation is that by making these surveys available to the community, these cores will be much more likely to be utilized, indeed discovered, by the community.
Many years ago Bill Ruddiman and John Farrell compiled CaCO3 stratigraphies for about 350 sediment cores from the Atlantic, Indian, and Pacific basins (Ruddiman and Farrell, 1992). These data were generated principally as a result of CLIMAP and SPECMAP related research and are accessible from numerous online data servers including NOAA-NGDC and PANGEA.
Meridional transects of unexamined sediment cores from the Atlantic and Pacific Basins harvested from the Lamont core collection. These cores are currently being analyzed for stratigraphy to provide an array of late Pleistocene core chronologies to the research community.
More recently, we have measured %CaCO3, %G. menardii, and %coarse fraction in a suite of cores from the Atlantic with the goal of providing a N-S transect with basic chronostratigraphic control for the latest Pleistocene (typically last 200-300 ka). Eighty-five cores between 45°N and 35°S (out of several thousand) were deemed suitable based on criteria such as proximity to the ridge axis, water depth near or above the modern lysocline (4200m), Pleistocene or younger basal age datums, and undisturbed, long core recovery. Of 46 cores analyzed so far, 33 were sufficiently promising for possible generation of oxygen isotope stratigraphies (by future researchers) and the list of samples run for %CaCO3 can be found here. Preliminary coretop G. ruber (white) oxygen isotopic and Mg/Ca data from this transect track mean annual SST and salinity gradients faithfully (Arbuszewski et al., 2010).
We are committed to identifying new, promising deep-sea sediment cores in the Lamont collection that can be used by the scientific community. Results will continue to be published on this website and will be accessible through the GeoMap App database. Investigation of a similar transect along the East Pacific Rise from 20°N to 35°S has recently begun and we anticipate completing the Atlantic core transect (about 40 remaining cores; white boxes in Figure) during the summer of 2012.
Ruddiman, W.F.; Farrell, J.W.,Calcium carbonate database, IGBP/PAGES World Data Center Paleoclimatology, Boulder, Colorado, NOAA Paleoclimatology Program, http://www.ngdc.noaa.gov/paleo/, 91-004, (1992)
On the fidelity of shell-derived δ18O seawater estimates, Arbuszewski, J.A.; deMenocal, P.; Kaplan, A.; Farmer, E.C., Earth and Planetary Science Letters, Volume 300, Issue 3-4, p.185-196, (2010)
The repository contains many sediment cores ranging up to 14 meters in length from lakes, bogs, salt marshes, freshwater marshes, rivers and peatlands. Collections are from the northeastern US, southeastern US, Alaska, and Chile as well as several sites in Siberia and on Easter Island. Currently the meta-data is being tabulated and will eventually be searchable with a user interface; in the meantime, please contact the Curator for information on this collection.
Data from these cores have been published in the following papers (a partial list):
Late-glacial and Holocene δ15N and δ13C variation from a Kenai Peninsula, Alaska peatland, Jones, M.; Peteet, D.; Sambrotto, R.,Paleogeography, Paleoclimatology, Paleoecology, Volume 293, p.132-143, (2010)
Medieval Warming, Little Ice Age, and European impact on the environment during the last millennium in the lower Hudson Valley, New York, USA, Pederson, D. C.; Peteet, D. M.; Kurdyla, D.; Guilderson, T., Quaternary Research, May, Volume 63, Issue 3, p.238-249, (2005), DOI 10.1016/j.yqres.2005.01.001 Abstract
We are expanding the types of cores housed at the LDCR to include coral samples and cores. Currently no national coral archiving system exists and coral cores are stored wherever the principle investigators (PIs) are located. Once PIs are finished with core analyses we can provide a place to properly archive these valuable coral samples for potential future analysis, similar to how sediment cores collected with federal funds are stored in accessible facilities such as ours. This new archive includes whole and split coral cores, core slabs, as well as metadata tags for species ID, collection location and water depth, X-ray negative and positive (if available) and associated digital geochemical data. Prof. Brad Linsley has recently brought his extensive collection of multi-century length coral cores from Rarotonga, Fiji, Tonga, Fanning Atoll, and Clipperton Atoll (total of 28 cores) to Lamont and will help oversee the development of coral archiving at Lamont. His unique collection promises to be an important archive for studying Pacific-wide climate variability at interannual and interdecadal timescales, and for reconstructing secular trends in oceanographic conditions over the last 400 years.
Drilling a large Porites coral in Ta'u. (Photo ctsy. of Brad Linsley.)
We hold 4,000 dredge and grab samples, including a large collection of manganese nodules, many of which were recovered by submersibles. Our dredge collection spans the globe and we have samples from a variety of tectonic settings. Some of these samples have few or no known equivalents on land.
Below is a map of our entire dredge collection. Circled areas have sample suites of particular regional significance and detailed information (including photographs (coming soon)) of dredges from within the outlined areas can be found at links below. [Click on the map for a larger image.]
Jim D. Hays, circa 1970.
Prof. James D. Hays radiolaria collection: The James D. Hays Radiolaria Slide Collection consists of tens of thousands of slides from hundreds of mostly Lamont-Doherty Earth Observatory deep-sea sediment cores. The slides, prepared between the late 1960’s and 2012, are primarily from the Antarctic south of 40° latitude, the North Pacific north of 40°, and the equatorial Pacific between 10°N and 10°S. The slides are standard microscope slides with 22x50mm cover slips using Canada Balsam as a mounting medium. Slides prepared prior to 1970 are strewn slides while most of those prepared after that date are randomly settled (Moore, 1973). In all cases the radiolarians were separated from the sediment using a 63 micron screen.
Method of randomly distributing grains for microscopic examination, Moore, T.C.J., Journal of Sedimentary Petrology, Volume 43, p. 904-906, (1973)
Vacuum-sealed cores: Between 1949 and 1959 almost 200 cores from the Arctic, Mediterranean, Gulf of Mexico, Caribbean, and across the North Atlantic, had quarter rounds vacuum-sealed in glass tubes when they were fresh. Most of these quarter rounds are still wet. The Arctic cores in this collection were taken on ice-islands; drifting ice packs solid enough and large enough for a small coring station. Those from the Mediterranean Sea were used for ostracode, foraminifera and pteropod stratigraphies as well as volcanic ash and paleomagnetism studies. The rest of these cores have been used to study topics as varied as coccoliths, clay mineralogy, volcanic ash, the calcite compensation depth, radiolaria, the Puerto-Rican Trench, the Mid-Ocean Ridge, fracture zones, ocean currents, glacial cycles and seismic refraction and reflection.
A brief list of papers in which these cores are discussed:
Atlantic Deep-Sea Sediment Cores, Ericson, D.B.; Ewing, M.; Wollin, G.; Heezen, B.C., Geol. Soc. Am. Bull., Volume 72, p. 193-286, (1961)
Arctic Ocean Quaternary Microfauna and its Relation to Paleoclimatology, Herman, Y., Paleogeography, Paleoclimatology, Paleoecology, Volume 6, p. 251-276, (1969)
Distribution of ostracoda in the Mediterranean, Puri, H.S.; Bonaduce, G.; Gervasio, A.M., Taxonomy, Morphology and Ecology of Recent Ostracoda, p. 356-410, (1969)
Sands of the Mid-Atlantic Ridge, Fox, P. J.; Heezen, B.C., Science, Volume 149, p. 1367-1370, (1965)
Residuals are samples returned to the Repository for various reasons. Most are of unused, unprocessed material for which the proposed work was never carried out for various reasons. Some are processed and the residual material could be useful for other research. Unless otherwise noted, the listed samples are unprocessed.