Core summary descriptions created in LogPlot 7 for 20 cores from offshore Puerto Rico and the U.S. Virgin Islands collected by the U.S. Geological Survey in 2008 (2008CoreSummaryDescriptions, JPEG image format)

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Frequently anticipated questions:

What does this data set describe?
Who produced the data set?
Why was the data set created?
How was the data set created?
How reliable are the data; what problems remain in the data set?
How can someone get a copy of the data set?
Who wrote the metadata?

What does this data set describe?

Title:

Core summary descriptions created in LogPlot 7 for 20 cores from offshore Puerto Rico and the U.S. Virgin Islands collected by the U.S. Geological Survey in 2008 (2008CoreSummaryDescriptions, JPEG image format)

Abstract:

In 2008, as a collaborative effort between Woods Hole Oceanographic Institution and the U.S. Geological Survey, 20 giant gravity cores were collected from areas surrounding Puerto Rico and the U.S. Virgin Islands. The regions sampled have had many large earthquake and landslide events, some of which are believed to have triggered tsunamis. The objective of this coring cruise, carried out aboard the National Oceanic and Atmospheric Administration research vessel Seward Johnson, was to determine the age of several substantial slope failures and seismite layers near Puerto Rico in an effort to map their temporal distribution. Data gathered from the cores collected in 2008 and 11 archive cores from the Lamont-Doherty Earth Observatory are included in this report. These data include lithologic logs, core summary sheets, x-ray fluorescence, wet-bulk density, magnetic susceptibility, grain-size analyses, radiographs, and radiocarbon age dates.

Supplemental_Information:

For more information on the USGS cruise, please see: https://cmgds.marine.usgs.gov/fan_info.php?fan=2008-008-FA

How might this data set be cited?
U.S. Geological Survey, 2014, Core summary descriptions created in LogPlot 7 for 20 cores from offshore Puerto Rico and the U.S. Virgin Islands collected by the U.S. Geological Survey in 2008 (2008CoreSummaryDescriptions, JPEG image format): Open-File Report 2014-1227, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.
Online Links:
This is part of the following larger work.
Hoy, Shannon K., Chaytor, Jason D., and Uri S. ten Brink, 2014, Core Data From Offshore Puerto Rico and the U.S. Virgin Islands: Open-File Report 2014-1227, U.S. Geological Survey, Reston, VA.
Online Links:
- https://doi.org/10.3133/ofr20141227
What geographic area does the data set cover?
West_Bounding_Coordinate: -67.0795
East_Bounding_Coordinate: -64.822830
North_Bounding_Coordinate: 19.17558
South_Bounding_Coordinate: 17.552930
What does it look like?

https://pubs.usgs.gov/of/2014/1227/data/3-CoreSummaryDescriptions/2008CoreSummaryDescription_browsegraphic.jpg (JPEG)
Example of core summary description created in LogPlot 7 from core SJ8-5GGC
Does the data set describe conditions during a particular time period?

Beginning_Date: 18-Mar-2008

Ending_Date: 24-Mar-2008

Currentness_Reference:

ground condition; cores collected in 2008
What is the general form of this data set?
How does the data set represent geographic features?
1. How are geographic features stored in the data set?
2. What coordinate system is used to represent geographic features?
How does the data set describe geographic features?
Entity_and_Attribute_Overview:
Although the core summary JPEG images are not geospatial, they are related to the core locations which are available in the PRcore_locations shapefile available from https://pubs.usgs.gov/of/2014/1227/data/1-CoreLocations/PRcore_locations.zip
The JPEG images graphically represent different types of collected data:
```
>Depth (cm)
```
Depth of core in centimeters Units of measure: centimeters
```
>Lithology
```
Symbols representing the lithology of the core. No data is represented by blank intervals. Symbology is denoted in the legend in the JPEG headers.
```
>Color
```
Color of core interval based on the Munsell Soil Color Chart (2010).
```
>Samples
```
What and where samples were taken. S=Smear Slide G= Grain-size
```
> Mean Grain Size (Phi)
```
average grain size at a specified depth. Unites of measure: phi
```
>Grain Size Distribution
```
graphical representation of percentage of grain-size that is sand, silt or clay, at a specified depth. Units of measure: percent
```
>Wet Bulk Density
```
Plot of wet bulk density collected by the GEOTEK MSCL-S multi-sensor core logger. Units of measure: g/cm3
```
>Magnetic Susceptibility
```
plots of magnetic susceptibility of core collected by a GEOTEK MSCL-S multi-sensor core logger Units of measure: SI
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
- U.S. Geological Survey
Who also contributed to the data set?
To whom should users address questions about the data?

Jason D. Chaytor

U.S. Geological Survey

Research Geologist

384 Woods Hole Road
Woods Hole, MA

(508) 548-8700 x2351 (voice)

(508) 457-2310 (FAX)

jchaytor@usgs.gov

Why was the data set created?

This data set contains summary descriptions (JPEG) for the 20 cores collected in 2008 on the R/V Seward Johnson during field activity 2008-008-FA. These descriptions were created in LogPlot 7 and represent descriptive core information including: color, lithology, samples taken, mean grain-size, grain-size distribution, wet bulk density, and magnetic susceptibility.

How was the data set created?

From what previous works were the data drawn?
PR Bathymetry (source 1 of 2)
Andrews, B.D., ten Brink, U.S., Danforth, W.W., Chaytor, J.D., Granja Burna, J.L., Llanes Estrada, P., and Carbo-Gorosabel, A., 2014, Bathymetric Terrain Model of Puerto Rico Trench and the Northeast Caribbean Region: Marine Geological Investigations: Open-File Report 2013-1125, U.S. Geological Survey, Reston, VA.
Online Links:
- https://doi.org/10.3133/ofr20131125
Type_of_Source_Media: Open-File Report
Source_Contribution:
The 50 meter grid was used for depth information in the sample area
GGC (source 2 of 2)
Hoy, Shannon K., Chaytor, Jason D., and Uri S. ten Brink, 2014, Core data from offshore Puerto Rico and the U.S. Virgin Islands: Open File Report 2014-1227, U.S. Geological Survey, Reston, VA.
Online Links:
- https://pubs.usgs.gov/of/2014/1227/
Type_of_Source_Media: physical samples
Source_Contribution:
The gravity cores collected during U.S. Geological Survey field activity 2008-008-FA. The Woods Hole Oceanographic Giant Gravity Corer (GGC) was used to collect the 20 cores in 2008. The gravity corer is a large diameter (10 centimeter) sampler that collects cores up to 6.5 meters in length. During field activity 2008-008-FA the corer was not rigged with liner longer than approximately 3 meters. Although cores were attempted at 40 core sites, core was recovered at only 20 sites. Seven additional sites yielded only samples (bagged) from the core catcher or cutting head. Of the 20 successful cores, three also have cutter/catcher bag samples.
How were the data generated, processed, and modified?
Date: 2009 (process 1 of 7)
Jason D. Chaytor examined the cores at the U.S. Geological Survey in Woods Hole at a centimeter scale. Hand-written observations were made of sediment type, notable bioturbation, shells, texture, color, stiffness, and additional features described in the core field descriptions. Person who carried out this activity:

Jason D. Chaytor

U.S. Geological Survey

Research Geologist

384 Woods Hole Road
Woods Hole, MA

(508) 548-8700 x2351 (voice)

(508) 457-2310 (FAX)

jchaytor@usgs.gov

Data sources used in this process:
- GGC
Data sources produced in this process:
- FieldDescriptions
Date: unknown (process 2 of 7)
Cores were tested with a GEOTEK MSCL-S multi-sensor core logger for wet-bulk density and magnetic susceptibility. Person who carried out this activity:

Brian Buczkowski

U.S. Geological Survey

Geological Samples Curator and Data Librarian

384 Woods Hole Road
Woods Hole, MA

(508) 548-8700 x2361 (voice)

(508) 457-2310 (FAX)

bbuczkowski@usgs.gov

Data sources produced in this process:
- MSCL
Date: unknown (process 3 of 7)
Data from hand-written logs, grain-size and multi-sensor core logging were entered into LogPlot 7 for each core. LogPlot 7 created a mean-grain size plot, as well as graphically represented the grain-size distribution. LogPlot 7 also created plots for the wet-bulk density and magnetic susceptibility data. Hand-written logs were graphically represented by lithology symbols, color text, and location where samples were taken. Person who carried out this activity:

Shannon K. Hoy

U.S. Geological Survey

Research Associate

384 Woods Hole Road
Woods Hole, MA

(508) 548-8700 x2297 (voice)

(508) 457-2310 (FAX)

shoy@usgs.gov

Data sources used in this process:
- FieldDescriptions
- Grain-Size
- MSCL
Date: unknown (process 4 of 7)
JPEG images of the summary descriptions were exported from LogPlot 7. Person who carried out this activity:

Shannon K. Hoy

U.S. Geological Survey

Research Associate

384 Woods Hole Road
Woods Hole, MA

(508) 548-8700 x2297 (voice)

(508) 457-2310 (FAX)

shoy@usgs.gov

Date: 03-Oct-2017 (process 5 of 7)
Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Added additional online links in the Identification section. Updated a cross-reference citation to go from "in prep" to published. Fixed a link to data in the entity and attribute overview section. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:

U.S. Geological Survey

Attn: VeeAnn A. Cross

Marine Geologist

384 Woods Hole Road
Woods Hole, MA

508-548-8700 x2251 (voice)

508-457-2310 (FAX)

vatnipp@usgs.gov

Date: 20-Jul-2018 (process 6 of 7)
USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:

U.S. Geological Survey

Attn: VeeAnn A. Cross

Marine Geologist

384 Woods Hole Road
Woods Hole, MA

508-548-8700 x2251 (voice)

508-457-2310 (FAX)

vatnipp@usgs.gov

Date: 08-Sep-2020 (process 7 of 7)
Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:

U.S. Geological Survey

Attn: VeeAnn A. Cross

Marine Geologist

384 Woods Hole Road
Woods Hole, MA

508-548-8700 x2251 (voice)

508-457-2310 (FAX)

vatnipp@usgs.gov
What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

How well have the observations been checked?
Files were double checked that filename matched the core that was described and that all data came from the same core.
How accurate are the geographic locations?
How accurate are the heights or depths?
Where are the gaps in the data? What is missing?
This report contains all of the summary descriptions from the 2008 SJ8 cores. There were 20 cores with summary descriptions: 5GGC, 7GGC, 8GGC, 9GGC, 10GGC, 12GGC, 13GGC, 17GGC, 18GGC, 20GGC, 21GGC, 22GGC, 23GGC, 24GGC, 28GGC, 31GGC, 33GGC, 34GGC, 38GGC, and 40GGC. There are missing numbers due to failed core attempts or a site that only yielded a bag samples. Also, not all fields are applicable for each core. For some cores, some samples were not taken or tests not performed, therefore there is no data represented in the respective fields. 10GGC, 12GGC, 34GGC and 40GGC lack grain-size information. 28GGC lacks multi-sensor core logger data (wet bulk density and magnetic susceptibility).
How consistent are the relationships among the observations, including topology?
The naming convention is: CoreName_summary. The core name is the core number paired with the abbreviation GGC, which stands for giant gravity corer (##GGC). Summary stands for summary descriptions created in LogPlot 7.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
The Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.

Who distributes the data set? (Distributor 1 of 1)

Jason D. Chaytor

U.S. Geological Survey

Research Geologist

384 Woods Hole Road
Woods Hole, MA

(508) 548-8700 x2351 (voice)

(508) 457-2310 (FAX)

jchaytor@usgs.gov
What's the catalog number I need to order this data set? Downloadable Data
What legal disclaimers am I supposed to read?
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

How can I download or order the data?

Availability in digital form:

Data format:	The WinZip version 18 file contains 20 JPEGS of core summary descriptions created in LogPlot 7 of 20 2008 cores from around Puerto Rico and the U.S. Virgin Islands and the associated metadata. in format JPEG (version information not available from original metadata) joint photographic experts group Size: 25
Network links:	https://pubs.usgs.gov/of/2014/1227/data/3-CoreSummaryDescriptions/2008CoreSummaryDescriptions.zip

Cost to order the data: None.

What hardware or software do I need in order to use the data set?
The user must be able to unzip a WinZip18 compressed file as well as view JPEGs.

Who wrote the metadata?

Dates:

Last modified: 16-Nov-2021

Metadata author:

U.S. Geological Survey

Attn: Shannon K. Hoy

Research Associate II

384 Woods Hole Road

Woods Hole, MA

United States

(508) 548-8700 x2297 (voice)

(508) 457-2310 (FAX)

whsc_data_contact@usgs.gov

Contact_Instructions:

The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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