Baltimore Canyon (Mid-Atlantic) area Outer Continental Shelf, East Coast U.S. README file NGDC Data Set #0000 obtained from: US Department of Commerce National Environmental Satellite, Data, and Information Service National Oceanic and Atmospheric Administration US National Geophysical Data Center (NGDC) (http://www.ngdc.noaa.gov/mgg/mggd.html) & co-located World Data Center for Marine Geology & Geophysics, Boulder (http://www.ngdc.noaa.gov/mgg/mggd.html) _______________________________________________________________________ NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THESE DATA _______________________________________________________________________ CONTRIBUTORS: James M. Robb/Norman G. Bailey US Geological Survey Office of Marine Geology Woods Hole, MA USA 02543 NAME OF DATA SET: Baltimore Canyon (Mid-Atlantic) LAST UPDATE: October, 1977 (original receipt date by NGDC) GEOGRAPHIC REGION: East Coast US DATA VOLUME: 4.03 mbytes MGG IDENTIFIER: Atlantis II MGG06275001 Advance II MGG06085001 Iselin MGG06595001 Pierce MGG06605001 Gillis MGG06615001 LIST OF FILES baltcanyon.1 - collection documentation baltcanyon.2 - grain size of sediments baltcanyon.3 - high molecular weight hydrocarbons baltcanyon.4 - hydrocarbon contaminant and intercalibration samples baltcanyon.5 - trace metals baltcanyon.6 - carbon content baltcanyon.7 - suspended sediment (see note) baltcanyon.8 - suspended matter baltcanyon.9 - clay mineralogy baltcanyon.10 - carbon-14 dates README this file SUMMARY This data set contains analytical data from samples acquired from the Baltimore Canyon (Mid-Atlantic) area of the Outer Continental Shelf, U.S. east coast, by the U.S. Geological Survey, Office of Marine Geology, Woods Hole, Mass., 02543, during the first year of environmental assessment work funded by the Bureau of Land Management (1 July 1975 - 30 June 1976). The data set contains ten files, see documentation below. AVAILABILITY Data are available for download from this server at no charge, data are also available in other formats. NGDC/WDC MGG, Boulder Technical Contact: Carla Moore NOAA/NGDC E/GC3 325 Broadway Boulder, CO 80305 USA phone: 303-497-6339 fax: 303-497-6513 email: Carla.J.Moore@noaa.gov DOCUMENTATION RECEIVED FROM THE USGS Baltimore Canyon (Mid-Atlantic) area Outer Continental Shelf, East Coast U.S. U.S. Geological Survey Office of Marine Geology Woods Hole, MA 02543 James M. Robb/Norman G. Bailey Geological and Environmental Data This data set contains analytical data from samples acquired from the Baltimore Canyon (Mid-Atlantic) area of the Outer Continental Shelf, U.S. east coast, by the U.S. Geological Survey, Office of Marine Geology, Woods Hole, Mass., 02543, during the first year of environmental assessment work funded by the Bureau of Land Management (1 July 1975 - 30 June 1976). The data set contains ten files. The files and their contents are: baltcanyon.1 - collection documentation baltcanyon.2 - grain size of sediments baltcanyon.3 - high molecular weight hydrocarbons baltcanyon.4 - hydrocarbon contaminant and intercalibration samples baltcanyon.5 - trace metals baltcanyon.6 - carbon content baltcanyon.7 - suspended sediment (see note) baltcanyon.8 - suspended matter baltcanyon.9 - clay mineralogy baltcanyon.10 - carbon-14 dates The first file ("station data") contains location and collection documentation for the subsequent files which contain the various analytical data. The station data in the first file are keyed to the contents of the subsequent files (except file 4) by a key number. The key number merely serves as a link between the station data and various analytical data to enable the data lines to be kept shorter than 130 characters, the usual capacity of a line printer. In many cases, the key number will appear in two or three of the data files, indicating that several types of analyses were performed on subsamples of the same prime sample. Similarly, repetition of a key number within a single file indicates that analyses were performed on parts of a single prime sample - grain size analyses at intervals down a single core, for example. The core intervals or in some cases, sample depth within water columns are included in the analytical data files. The original magnetic tape was 9-track, written in EBCDIC, 800bpi, phase encoded in 10 files, unblocked with a single EOF following each file and a double EOF following the final file. Format and documentation for each file type is given below. File 1 - Station data; location and collection information Contents Spaces ---------------------------------------------------------------- 1. Key number 1-4 2. Agency collecting sample 5-8 USGS = USGS, Woods Hole, MA VIMS = Virginia Institute of Marine Science 3. Ship name 10-23 4. Cruise number 25-30 5. Station number 32-36 (note that station number identifies only a nominal location and that precise location (latitude and longitude) will vary with different samples collected at different times, either during the same or different periods of occupation of a station.) 6. Date of collection (yymmdd) 38-43 (date of start of cruise if actual collection date is unavailable.) 7. Latitude 46-52 8. Longitude 54-60 9. Water depth (meters) 62-66 10.Sample device code 68-70 GRB = grab sampler (commonly Smith MacIntyre; see remarks, next field) HGC = hydrostatic gravity corer VC = vibracore SES = suspended sediment 11.Remarks 73-86 includes vibracore total lengths or submersible name and dive number for grab samples taken during submersible dives. NEKB = Nekton Beta (submersible) NEKG = Nekton Gamma (submersible) File 2 - Sediment grain size data Contents Spaces --------------------------------------------------------- 1. Key number 1-3 2. Sample depth in sediment 5-11 interval in core (cm) SURF = surface 3. Name of responsible investigator 13-20 4. Analytical method code 22-25 R = rapid sediment analyzer (sand fraction) C = Coulter counter P = Pipette 5. Mean size (phi) 27-31 6. Median size (phi) 32-37 7. Standard Deviation (phi) 39-43 8. Skewness 45-48 9. Kurtosis 50-53 10.% gravel (<-1 phi) 55-59 11.% sand (-1 phi to 4 phi) 61-65 12.% silt (>4 phi to <8 phi) 67-71 13.% clay (>8 phi) 73-77 14.% mud (equivalent to %silt + %clay) 79-83 15.% very coarse sand (-1 phi to 0) 85-89 16.% coarse sand (0 phi to 1 phi) 91-95 17.% medium sand (1 phi to 2 phi) 97-101 18.% fine sand (2 phi to 3 phi) 103-107 19.% very fine sand (3 phi to 4 phi) 109-113 File 3 - High molecular wieght hydrocarbon analyses (Summary data: more complete records of analyses are contained on microfilm held by the EDS - NGDC note: NGDC does not have copies of the microfilm, they were not submitted with the data) Content Spaces --------------------------------------------------------- 1. Key number 1-3 2. Sample depth (in sediment cm; SURF=surface) 5-11 3. Name of responsible investigator 13-20 4. Analytical method code (GC=gas chromatograph) 22-25 5. n-Alkane (Hexane) 27-32 (micro g/g of sediment resolved) 6. n-Alkane (odd/even ratio) 34-39 7. Isoprenoid Alkane/n-Alkane ration 41-45 8. Pristane/Phytane ratio 47-51 9. Pristane/n-C17 ratio 53-58 10.Phytane/n-C18 ratio 60-64 11.Normal Alkane/branched Alkane ratio 66-71 12.Benzene resolved (micro g/g of sediment) 73-78 (mainly methyl esters) 13.Total lipid recovery (micro g/g of sediment) 80-86 File 4 - Hydrocarbons Analysis of potential contaminants and intercalibration samples Content Spaces ------------------------------------------------------- 1. Sample identification 1-23 2. Ship 25-30 3. Cruise 32-58 4. n-Alkane (Hexane) (micro g/g of sediment resolved) 60-70 5. n-Alkane (odd/even ratio) 72-78 6. Isoprenoid Alkane/n-Alkane ratio 80-85 7. Pristane/Phytane ratio 87-91 8. Pristane/n-C17 ratio 93-97 9. Phytane/n-C18 ratio 99-103 10.Normal Alkane/branched Alkane ratio 105-110 11.Benzene resolved (micro g/g of sediment 112-121 mainly methyl esters) 12.Total lipid recovery (micro g/g of sediment) 123-132 Note: This file does not key to any collection data in File 1. Method and investigator same as hydrocarbon analyses in File 3. File 5 - Trace metal analyses Content Spaces -------------------------------------------------------- 1. Key number 1-3 2. Sample depth (in sediment, cm; SURF=surface) 5-11 3. Name of responsible investigator 13-20 4. Analytical method code 22-25 (AA = wet chemical decomposition followed by Atomic Absorption) 5. Fe2O3 (%) 27-31 6. Fe (ppm) 33-37 7. Pb (ppm) 39-42 8. Zn (ppm) 44-45 9. Ba (ppm) 47-50 10.Cu (ppm) 52-56 11.Ni (ppm) 58-61 12.V (ppm) 63-64 13.Cr (ppm) 66-69 14.Cd (ppm) 71-77 File 6 - Carbon content Content Spaces ------------------------------------------------------- 1. Key number 1-3 2. Core interval (cm) 5-11 3. Name of responsible investigator 13-20 4. Analytical method code 22-25 (LECO Carbon Analyzer) 5. Total carbon (mg/g of sediment) 27-30 6. Organic carbon (mg/g of sediment) 32-35 7. Remainder (mg/g of sediment) 37-40 File 7 - Suspended sediment analyses Content Spaces ------------------------------------------------------- 1. Key number 1-3 2. Sample depth (in water column; meters) 5-11 3. Name of responsible investigator 13-20 4. Analytical method code 22-25 F = filtration G = gravimetric analysis 5. Filter type (M=millipore; N=nucleopore) 27 6. Water volume (liters) 29-33 7. Total suspended matter (mg/liter) 35-39 8. Insoluble concentrate (Mg/l) 41-45 (insoluble in H2O2) 9. Insoluble concentrate (%) 47-50 10.Soluble concentrate (Mg/l) 52-56 11.Soluble concentrate (%) 58-61 Note: File 7 and File 8 both contain analyses of material filtered from the water column, but represent results from different analytical methods. File 7 ("suspended sediment") contains analyses using H2O2 as an oxidizing agent. File 8 ("suspended matter") contains analyses using combustion to distinguish organic from inorganic material, along with microscopic inspection to identify the detritus. File 8 - Suspended matter analyses Content Spaces ------------------------------------------------------ 1. Key number 1-3 2. Sample depth (in water column; meters) 5-11 3. Name of responsible investigator 13-20 4. Analytical method code 22-25 F = filtration G = gravimentric analysis A = ashing M = microscopic inspection 5. Temperature (degrees C) 27-31 6. Conductivity (millimho/cm) 33-37 7. Total suspended matter (mg/l) 39-43 8. Combustible matter (mg/l) 45-49 9. Combustible matter (%) 51-54 10.Noncombustible matter (mg/l) 56-60 11.Noncombustible matter (%) 62-65 12.Light transmission (%) 67-70 13.Mineral grains* 72-76 14.Diatoms* 78-93 15.Silicoflagellates* 95-99 16.Remarks 101-132 *Note: Relative abundances Diatoms ------------------- -------------------- 1=Trace B=Bacteriastrum 2=Present C=Coscinodiscus 3=Common Ce=Centrate diatoms 4=Prominent Ch=Chaetoceros 5=Abundant Frag(s)=Fragmented frustrules 6=Very abundant N=Nitzschia Pe=Pennate diatoms S=Skeletonema T=Thalassiothrix Silicoflagellates Dinoflagellates ------------------ -------------------- Ds=Distephanus Cer=Certium Dt=Dictyocha File 9 - Clay mineralogy Content Spaces ------------------------------------------------------ 1. Key number 1-3 2. Core interval (cm) 5-11 3. Name of responsible investigator 13-20 4. Analytical method code 22-25 (XDF = Xray diffraction) 5. Mica (%) 27-30 6. Chlorite (%) 32-35 7. Kaolinite (%) 37-40 8. Smectite (%) 42-45 9. Comments 47-86 File 10 - Carbon-14 dates Content Spaces ------------------------------------------------------ 1. Key number 1-3 2. Core interval (cm) 5-11 3. Name of responsible investigator 13-20 4. Laboratory ID# 22-28 (USGS Analytical Laboratories, Reston, VA) 5. Material 30-54 6. Age (yrs. B.P.) 56-62 7. Error (+/- yrs. B.P.) 64-69 The above documentation was supplied with the original data submitted to NOAA/NGDC on magnetic tape - these data were archived on tape W06795, migrated to 3480 tape number 532.