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The MAFLA (Mississippi, Alabama, Florida) Study, Grain Size Analyses

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The MAFLA (Mississippi, Alabama, Florida) Study was funded by NOAA as part of the Outer Continental Shelf Program. Dr. L.J. Doyle produced grain size analyses in the historic 073 format for 2,168 sea floor samples collected on multiple cruises (MAFLA cruises 2, 10, 11, 29, 39, 14, 21, and MAFLA DM1 and DM2) conducted in the Gulf of Mexico from May 16, 1974 through February 20, 1978. Data include collecting institution, ship, cruise, sample id, latitude/longitude, date of collection, water depth, sampling device, method of analysis, sample weight, sampled interval, raw weight percentages of sediment, within a given phi range. Some samples also have percentages of total gravel, sand, silt, clay, and statistical measurements such as mean, median, skewness, kurtosis, and standard deviation of grain size. These data are part of the larger NCEI digital grain size database.

Cite this dataset when used as a source.

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Distribution Formats
Distributor DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Point of Contact Marine Geology Data Manager
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
(303) 497-6339
General Documentation
Associated Resources
  • L. J. Doyle
    University of Southern Florida
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • publication: 1985-03-20
  • revision: 1985-03-20
Edition: First
Data Presentation Form: Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete
Data Update Frequency: Not planned  -  Completed data set, no additions planned.
Supplemental Information: minimal documentation, added to NGDC grainsize database
Purpose: environmental research
Use Limitations
  • Please cite the originator of the data set, the date downloaded, and the National Centers for Environmental Information, NOAA, as the source of the data.
  • Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
Time Period: 1974-05-16  to  1978-02-20
Spatial Reference System: urn:ogc:def:crs:EPSG:4326
Spatial Bounding Box Coordinates:
N: 30.305
S: 25.647
E: -82.248
W: -88.949
Spatial Coverage Map:
  • Scientific archives
  • Electronic records
  • Oceanography
  • Ocean bottom
  • Geology
  • Submarine geology
  • Marine sediments
  • Marine geology
  • Sea-floor characteristics
  • EARTH SCIENCE > OCEANS > Coastal Processes > Sedimentation
  • EARTH SCIENCE > OCEANS > Marine Sediments > Sedimentation
  • EARTH SCIENCE > Oceans > Marine Sediments > Sedimentary Textures
  • EARTH SCIENCE > Oceans > Marine Environment Monitoring
Data Centers
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • In Situ Ocean-based Platforms > SHIPS
  • In Situ/Laboratory Instruments > Corers > CORING DEVICES
  • In Situ/Laboratory Instruments > Samplers > Grabbers/Traps/Collectors > GRAB SAMPLERS
  • In Situ/Laboratory Instruments > Corers > SEDIMENT CORERS
  • OCS > Outer Continental Shelf Program
  • ICSU-WDS > International Council for Science - World Data System
  • Mississippi/Alabama/Florida Area Environmental Study (MAFLA)
Use Constraints
  • While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Access Constraints
  • Access to this dataset is unrestricted.
  • free online download
Source Datasets
Lineage Statement These data were contributed by the originator to NOAA's former National Oceanographic Data Center (NODC) and may be part of a larger compilation archived as oceanographic data by NCEI. Data were contributed on nine track magnetic tape in ASCII form, as 80 character records blocked to 4800 characters/block. Ten files of MAFLA data were followed by additional STOCS data on the tape, as described in a separate metadata record. Data files included cruises MAFLA002, MAFLA010, MAFLA011, MAFLA014, MAFLA021, MAFLA029, MAFLA039, MAFLADM1, MAFLADM2, and MAFLADM4 - 15,175 records of 073 grain size data with no significant errors, so they were added to the NGDC Seafloor Sediment Grain Size Database.
Processing Steps
  • NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Processing Environment Native Dataset Environment: ASCII text

Metadata Last Modified: 2015-11-06

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