The MAFLA (Mississippi, Alabama, Florida) Study, Grain Size Analyses
Dataset Identification:
Resource Abstract:
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.
Citation
Title The MAFLA (Mississippi, Alabama, Florida) Study, Grain Size Analyses
publication Date
1985-03-20
revision Date
1985-03-20
Edition First
presentationForm
tableDigital
Series
Name Marine Geology and Geophysics (MGG)
Issue MGG03995010
cited responsible party
-
originator
individual Name L. J. Doyle
organisation Name
University of Southern Florida
cited responsible party
-
publisher
organisation Name
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Description The Library of Congress Subject Headings (LCSH) are part of a Linked Data Service, actively maintained since 1898 to catalog
materials held at the Library of Congress.
Description The SeaDataNet Vocabulary Server is populated with lists describing a wide range of entities relevant to marine metadata and
data such as parameters, sea area names, platform classes, instrument types, and so on.
Description The USGS Thesaurus contains thematic terms for categorizing information resources intended to support finding and understanding
scientific information.
other Citation Details
Cinergi keyword enhanced.File generated at Fri Dec 14 21:17:19 UTC 2018
purpose:
environmental research
Browse image (thumbnail):
thumbnail file name:
file type: GIF
thumbnail file description:
sample locations in study area
Resource language:
eng; USA
Character set encoding of resource:
UTF8
Resource progress code:
completed
Resource Maintenance Information
maintenance or update frequency:
notPlanned
notes: Completed data set, no additions planned.
Constraints on resource usage:
Constraints
Use limitation statement:
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.
Constraints on resource usage:
Constraints
Use limitation statement:
Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United
States.
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other 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.
Constraints on resource usage:
Security Constraints
Classification
unclassified
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Access to this dataset is unrestricted.
Spatial representation type code:
vector
Processing environment:
Native Dataset Environment: ASCII text
Spatial resolution:
Resource extent
Extent description
Gulf of Mexico offshore Mississippi, Alabama, and Florida
Geographic Extent
Geographic Bounding Box
westBoundLongitude
-88.949
eastBoundLongitude
-82.248
northBoundLatitude
30.305
southBoundLatitude
25.647
Temporal Extent
Sampling Dates
1974-05-16
1978-02-20
Vertical Extent
bottom -192
top -10
Additional information on resource:
minimal documentation, added to NGDC grainsize database
Credits:
L. J. Doyle, University of Southern Florida, with funding from the National Oceanic and Atmospheric Administration (NOAA)
point of contact
-
pointOfContact
individual Name Marine Geology Data Manager
organisation Name
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
position Name Marine Geology Data Manager
Contact information
Telephone
Voice (303) 497-4603
Fax (303) 497-6513
Address
325 Broadway, Mail Code E/NE42, Boulder, CO, 80305-3328
Country USA
Cell value attribute description:
The Latitude and Longitude (point) from which a sample of sediment or rock was collected from the sea floor or a lakebed.
Band
descriptor Distance measured north or south from the equator. Distance north is positive, distance south is negative.
sequence Identifier
name Latitude
Long Wavelength
90.00000
Short Wavelength
-90.00000
units
Band
descriptor Longitude is measured from the Prime Meridian (which is the north/south line that runs through Greenwich, England), values
measured east are positive and values measured west are negative.
Cell value attribute description:
Information about the location from which a sample of sediment or rock was collected from the sea floor or a lakebed.
Band
descriptor The depth from the surface of the water to the sea floor or lakebed at the location where a measurement was taken or sample
collection was begun.
Cell value attribute description:
Weight percent of particles within a specified size range.
Band
descriptor Percentage, by weight, of the particles from a sample or subsample that falls within a specified particle size range. The
range may be expressed in milimeters or phi as inidcated in the dataset.
Description Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems
and Coordinate Transformations.
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 Step
date and time 1985-03-20T00:00:00
description From 1975 through the 1980s, most sediment data collected as part of offshore environmental baseline and/or habitat studies
were part of a suite of measurements sent to NODC or NODC liasons. NODC data managers, primarily Francis Mitchel, then sent
the sediment-related data (e.g., physical properties, composition, geochemstry, mineralogy) to the former NGDC as the authoritative
archive and distribution point for sediment data. Many sediment analyses and descriptions, however, were maintained by NODC
as benthic habitat data, and some additional sediment data were duplicated between the NODC and NGDC archives.
source
source description
L. J. Doyle, University of Southern Florida
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy
measure Description
evaluation Method Description
The horizontal accuracy of data values is approximately .001 degree of latitude/longitude.
QuantitativeAttributeAccuracy
name Of Measure Reliability
measure Description
evaluation Method Description
Quality control was performed by the originator. NCEI performed basic out-of-range location testing.