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Thermal maturity patterns (CAI and %Ro) in the Ordovician and Devonian rocks of the Appalachian Basin in New York

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   Weary, David J. , Ryder, Robert T. , and Richard, 2000, Thermal maturity patterns (CAI and %Ro) in the Ordovician and Devonian rocks of the Appalachian Basin in New York: U.S. Geological Survey Open-File Report 00-496, United States Geological Survey, Reston, VA.

   Online Links:

   • <http://pubs.usgs.gov/openfile/of00-496/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -79.4740

   East_Bounding_Coordinate: -75.3314

   North_Bounding_Coordinate: 43.3688

   South_Bounding_Coordinate: 41.9910

3. What does it look like?

   <http://geo-nsdi.er.usgs.gov/metadata/open-file/00-496/browse.gif> (GIF87)

   Well locations, isograds, and county boundaries in an image 697x475 pixels 8-bit color

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 1997

   Ending_Date: 2000

   Currentness_Reference: publication date

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: Map

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Point data set. It contains the following vector data types (SDTS terminology):

      • Point (60)

   2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: State Plane Coordinate System 1927

      State_Plane_Coordinate_System:

      SPCS_Zone_Identifier: New York, Central

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.999938

      Longitude_of_Central_Meridian: -76.583333

      Latitude_of_Projection_Origin: 40.0

      False_Easting: 500000

      False_Northing: 0.0

      Planar coordinates are encoded using Row and column
      Planar coordinates are specified in Feet

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 20925832.1618739.
      The flattening of the ellipsoid used is 1/294.98.
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   user defined point data:
   ny_api# is the American Petroleum Institute suffix number for each well.
   Ocai_min is the minimum CAI value for an Ordovician conodont sample, ranges from 1 to 5
   Ocai_max is the maximum CAI value for an Ordovician conodont sample, ranges from 1 to 5
   Dcai_min is the minimum CAI value for a Devonian conodont sample, ranges from 1 to 4
   Dcai_min is the maximum CAI value for a Devonian conodont sample, ranges from 1 to 4
   %Ro is the vitrinite reflectance value for a Devonian black shale sample
   Vector data:
   O_cai is interpreted Ordovician CAI isogad line, values from 1.5 to 5
   D_cai is interpreted Devonian CAI isograd line, values from 1.5 to 3.5

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • David J. Weary
   • Robert T. Ryder
   • Richard

2. Who also contributed to the data set?

3. To whom should users address questions about the data?
   U.S. Geological Survey
   c/o David Weary
   Geologist
   MS 926A National Center
   Reston, VA 20192
   USA
   

   703-648-6897 (voice)
   703-648-6953 (FAX)
   dweary@usgs.gov
   

   Hours_of_Service: 7:00 - 3:30 EST

Why was the data set created?

This data will allow better modeling of the burial, unroofing and hydrocarbon generation history for the Appalachian basin in New York, and is part of a larger, ongoing project which will include data from several adjoining states.

How was the data set created?

1. From what previous works were the data drawn?

   I-917 (source 1 of 1)

   Harris, A.G., Harris, L.D., and Epstein, J.B., 1978, Oil and gas data from Paleozoic rocks in the Appalachian basin: Maps for assessing by hydrocarbon potential and thermal maturity (conodont color alteration isograds and overburden isopachs): U.S. Geological Survey Miscellaneous Investigations Series Map I-917, U.S. Geological Survey, Reston, VA.

   Type_of_Source_Media: paper

   Source_Scale_Denominator: 2500000

   Source_Contribution:

   Some of the Harris, Harris, and Epstein, 1978, data was incorporated into this study.

2. How were the data generated, processed, and modified?

   Date: 1999 (process 1 of 1)

   Datapoints (well locations) were generated in ESRI ArcInfo from x,y coordinates provided by the New York Geological Survey . These points were plotted on a New York State, and counties outlines obtained from the ESRI ArcView 3.1 map dataset. Points from the Harris, Harris, and Epstein (1978) maps were incorporated by scanning the published paper maps, georegistering them to the New York State map in ArcInfo, and manually placing and attributing the sample locations in ArcInfo. CAI and %Ro isograds were interpreted from the point data and manually drawn over that data in ArcView 3.2.

   Person who carried out this activity:
   

   David Weary
   U.S. Geological Survey
   Geologist
   MS926A National Center
   Reston, VA 20192
   USA
   

   703-648-6897 (voice)
   703-648-6953 (FAX)
   dweary@usgs.gov
   

   Hours_of_Service: 7:30 - 4:00 EST

   Data sources used in this process:

   • I-917

3. What similar or related data should the user be aware of?

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

1. How well have the observations been checked?

   All attributes created during the creation process were displayed to the screen and checked against hard copies, but no formal tests were performed.

2. How accurate are the geographic locations?

   Positions of new data generated for this report were plotted using tabular position data supplied by the New York Geological Survey. These consisted of x-y coordinate pairs in degrees, minutes and seconds or in decimal degrees taken to 5 decimal places. The true accuracy of the original data is not known, but most of the data points should be located within a second of their true locations. It is possible that some well locations were previously rounded to the nearest minute. All locations were checked against a state map to make certain they plotted within the correct Township. The state map and county outlines supplied in this report were copied from the ESRI data set supplied with ArcView 3.1. This data is appropriate for use at State and inter-county scales, but may not be appropriate at intra-county scales.

3. How accurate are the heights or depths?

   No vertically attributed features were generated for this report, so no vertical accuracy estimates are made.

4. Where are the gaps in the data? What is missing?

   All of the new data generated for this report are located within the state of New York. Some peripheral points from previous studies were included for completeness and to compliment contouring. Several of these points are located in Canada.

5. How consistent are the relationships among the observations, including topology?

   These data are believed to be logically consistent, though no tests were performed. Line and point geometry is topologically clean.

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: none

1. Who distributes the data set? (Distributor 1 of 1)
   U.S. Geological Survey
   c/o David Weary
   Geologist
   MS 926A National Center
   Reston, VA 20192
   USA
   

   703-648-6897 (voice)
   703-648-6953 (FAX)
   dweary@usgs.gov
   

   Hours_of_Service: 7:30 - 4:00 EST

2. What's the catalog number I need to order this data set?

   USGS Open-File Report 00-496

3. What legal disclaimers am I supposed to read?

   Users must assume responsibility to determine the appropriate use of these data.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	A georeferenced subset of that in the tables and figures of the paper in format ArcView Shapefiles (version 1.0) Size: 0.353 megabytes
     Network links:	<http://pubs.usgs.gov/openfile/of00-496/arcview.zip>

     Data format:	Tables 3 and 4 of the publication in format Microsoft Excel (version Microsoft Office 2000) Size: 0.089 megabytes
     Network links:	<http://pubs.usgs.gov/openfile/of00-496/TABLE3.XLS> <http://pubs.usgs.gov/openfile/of00-496/TABLE4.XLS>

     Data format:	The text, with figures and tables 1 and 2 of the paper document are contained in NY_TEXT.PDF. Tables 3 and 4 are provided in separate PDF files. in format PDF (version 1.2) Size: 4.1 megabytes
     Network links:	<http://pubs.usgs.gov/openfile/of00-496/NY_TEXT.PDF> <http://pubs.usgs.gov/openfile/of00-496/TABLE3.PDF> <http://pubs.usgs.gov/openfile/of00-496/TABLE4.PDF>

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 30-Jan-2001
Last Reviewed: 01-Feb-2001

Metadata author:

U.S. Geological Survey
c/o David Weary
Geologist
MS 926A National Center
Reston, VA 20192
USA

703-648-6897 (voice)
703-648-6953 (FAX)
dweary@usgs.gov

Hours_of_Service: 7:30 - 4:00 EST

Metadata standard:

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