Digital data for geologic framework of the Alaska Peninsula, southwest Alaska, and the Alaska Peninsula terrane

Frequently anticipated questions:

• What does this data set describe?
  1. How might 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 might this data set be cited?
   Wilson, F.H., Detterman, R.L., and DuBois, G.D., 1999, Digital data for geologic framework of the Alaska Peninsula, southwest Alaska, and the Alaska Peninsula terrane: U.S. Geological Survey Open-File Report 99-317.

   Online Links:

   • http://pubs.usgs.gov/of/1999/0317/

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -164.0
   East_Bounding_Coordinate: -153.0
   North_Bounding_Coordinate: 59.0
   South_Bounding_Coordinate: 54.0
   

3. What does it look like?

   http://pubs.usgs.gov/of/1999/0317/pdf/akpen.pdf (PDF - Adobe portable document format)

   Map showing the geologic framework of the Alaska Peninsula

   http://pubs.usgs.gov/of/1999/0317/akpen.eps (EPS)

   Map showing the geologic framework of the Alaska Peninsula

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

   Calendar_Date: 1995

   Currentness_Reference:

   map compilation completed

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 vector data set.
   2. What coordinate system is used to represent geographic features?
      The map projection used is Albers Conical Equal Area.
      

      Projection parameters:

      Standard_Parallel: 55.0
      Standard_Parallel: 65.0
      Longitude_of_Central_Meridian: -154.0
      Latitude_of_Projection_Origin: 50.0
      False_Easting: 0
      False_Northing: 0
      

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 50
      Ordinates (y-coordinates) are specified to the nearest 50
      Planar coordinates are specified in meters
      
7. How does the data set describe geographic features?

   arcs

   Characteristics of arcs in the arc attribute table of the geology and fold coverages (Source: USGS OFR 99-317)

   arc-code

   Arc-code is a positive integer value (3 3 I) item in the arc attribute table. Values range from 1-99. Arc-code describes the type of line feature. (Source: USGS OFR 99-317)

   Value	Definition
   0	arc used to subdivide very large polygons
   1	Stratigraphic or intrusive contact, location certain
   2	Stratigraphic or intrusive contact, location approximate or inferred
   3	Stratigraphic or intrusive contact, location inferred
   4	Normal fault, location certain
   5	Normal fault, location approximate
   6	Normal fault, location inferred
   7	Shoreline or riverbank
   9	Boundary of altered zone or hornfels
   10	Thrust fault, location certain; teeth on right from origin
   11	Thrust fault, location approximate; teeth on right from origin
   12	Thrust fault, location inferred; teeth on right from origin
   14	Caldera or crater rim
   15	Ice contact
   18	Internal contact
   21	Syncline, location certain; digitized in direction of plunge
   22	Syncline, location approximate; digitized in direction of plunge
   23	Syncline, location inferred; digitized in direction of plunge
   24	Anticline, location certain; digitized in direction of plunge
   25	Anticline, location approximate, digitized in direction of plunge
   26	Anticline, location inferred; digitized in direction of plunge
   41	Syncline, overturned, location certain; digitized in direction of plunge
   42	Syncline, overturned, location approximate; digitized in direction of plunge
   43	Syncline, overturned, location inferred; digitized in direction of plunge
   44	Anticline, overturned, location certain; digitized in direction of plunge
   45	Anticline, overturned, location approximate; digitized in direction of plunge
   46	Anticline, overturned, location inferred; digitized in direction of plunge
   50	Dikes and sills
   51	Concealed contact
   52	Concealed fault
   53	Concealed thrust fault
   61	Syncline, location certain, no plunge
   62	Syncline, location approximate, no plunge
   63	Syncline, location inferred, no plunge
   64	Anticline, location certain, no plunge
   65	Anticline, location approximate, no plunge
   66	Anticline, location inferred, no plunge
   71	Normal fault, location certain, having right lateral oblique slip
   72	Normal fault, location approximate, having right lateral oblique slip
   73	Normal fault, location certain, having left lateral oblique slip
   74	Normal fault, location approximate, having left lateral oblique slip
   75	Normal fault, location inferred, having left lateral oblique slip
   77	Fault, location certain, sense of displacement unknown
   78	Fault, location inferred, sense of displacement unknown
   79	Fault, location approximate, sense of displacement unknown
   87	Right lateral fault, location certain
   88	Right lateral fault, location approximate
   89	Right lateral fault, location inferred
   90	Left lateral fault, location certain
   91	Left lateral fault, location approximate
   92	Left lateral fault, location inferred
   93	Lineament
   99	Bounding line of coverage

   polygons

   Characteristic of the polygon features are coded in the pat, polygon attribute table. The pat consists of the following items: CLASS, LABEL (geologic unit label), SYMBOL (shadeset color symbol), YAGE (minimum age in m.y.), OAGE (maximum age in m.y.), LITH1, LITH2.
   (Source: USGS OFR 99-317)

   class

   Class is a positive integer value (4 5 B) item in the polygon attribute table. Values range from 99-2999. A single lookup table for all the geology coverages contain the unit label and color symbol number or each unit. (See USGS OFR 99-317 for full descriptions of the geologic unit. (Source: USGS OFR 99-317)

   Value	Definition
   99	bu - Unknown bedrock
   100	Qa - Alluvial deposits (Holocene and Pleistocene)
   101	g - Glaciers
   102	Water
   105	Qa - Alluvial deposits (Holocene and Pleistocene)
   106	Qaf - Alluvial fan and landslide deposits (Holocene and Pleistocene)
   107	Qaf - Alluvial fan and landslide deposits (Holocene and Pleistocene)
   108	Qa - Alluvial deposits (Holocene and Pleistocene)
   110	Qa - Alluvial deposits (Holocene and Pleistocene)
   111	Qa - Alluvial deposits (Holocene and Pleistocene)
   112	Qa - Alluvial deposits (Holocene and Pleistocene)
   113	Qa - Alluvial deposits (Holocene and Pleistocene)
   115	Qb - Marine beach and estuarine deposits (Holocene and Pleistocene)
   116	Qb - Marine beach and estuarine deposits (Holocene and Pleistocene)
   117	Qmt - Marine terrace deposits (Holocene and Pleistocene)
   120	Qa - Alluvial deposits (Holocene and Pleistocene)
   125	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   126	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   127	Qa - Alluvial deposits (Holocene and Pleistocene)
   130	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   131	Qa - Alluvial deposits (Holocene and Pleistocene)
   135	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   136	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   137	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   138	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   139	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   140	Qa - Alluvial deposits (Holocene and Pleistocene)
   142	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   143	Qa - Alluvial deposits (Holocene and Pleistocene)
   145	Qm - Moraines and other glacial deposits (Holocene and Pleistocene)
   146	Qa - Alluvial deposits (Holocene and Pleistocene)
   150	Qv - Volcanic rocks (Holocene and Pleistocene)
   151	Qv - Volcanic rocks (Holocene and Pleistocene)
   152	Qv - Volcanic rocks (Holocene and Pleistocene)
   153	Qv - Volcanic rocks (Holocene and Pleistocene)
   154	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   155	Qv - Volcanic rocks (Holocene and Pleistocene)
   160	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   161	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   162	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   164	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   165	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   170	Qv - Volcanic rocks (Holocene and Pleistocene)
   171	Qi - Intrusive rocks (Holocene and Pleistocene)
   172	Qpd - Pyroclastic and debris-flow deposits (Holocene and late Pleistocene?)
   180	Qi - Intrusive rocks (Holocene and Pleistocene)
   181	Qi - Intrusive rocks (Holocene and Pleistocene)
   182	Qi - Intrusive rocks (Holocene and Pleistocene)
   190	QTv - Volcanic rocks (Quaternary and Pliocene?)
   191	QTm - Morzhovoi Volcanics (early Quaternary?, Pliocene, and late Miocene?)
   192	QTp - Pyroclastic deposits (Pleistocene? and Pliocene)
   193	QTv - Volcanic rocks (Quaternary and Pliocene?)
   210	Tmr - Milky River Formation (Pliocene)
   211	Tmr - Milky River Formation (Pliocene)
   221	Tta - Tachilni Formation (late Miocene)
   222	Tbl - Bear Lake Formation (late and middle Miocene)
   230	Tu - Unga Formation (middle Miocene to late Oligocene)
   231	Th - Hemlock Conglomerate (late Oligocene)
   232	Tbe - Belkofski Formation (middle Miocene? to late Oligocene?)
   240	Ts - Stepovak Formation (early Oligocene and late Eocene)
   250	Tc - Copper Lake Formation (early Eocene and Paleocene?)
   260	Tt - Tolstoi Formation (middle Eocene to late Paleocene)
   300	Tvu - Volcanic rocks, undivided (Tertiary)
   301	Tvu - Volcanic rocks, undivided (Tertiary)
   302	Tvu - Volcanic rocks, undivided (Tertiary)
   303	Tvu - Volcanic rocks, undivided (Tertiary)
   305	Tvu - Volcanic rocks, undivided (Tertiary)
   310	Tv - Volcanic rocks (late Miocene)
   311	Tv - Volcanic rocks (late Miocene)
   331	Tm - Meshik Volcanics (early Oligocene and late Eocene)
   332	Tm - Meshik Volcanics (early Oligocene and late Eocene)
   333	Tm - Meshik Volcanics (early Oligocene and late Eocene)
   334	Tm - Meshik Volcanics (early Oligocene and late Eocene)
   335	Tm - Meshik Volcanics (early Oligocene and late Eocene)
   350	Tiu - Intrusive rocks, undivided (Tertiary)
   351	Tiu - Intrusive rocks, undivided (Tertiary)
   352	Tgd - Granodiorite (Oligocene)
   353	Tqd - Quartz diorite (Oligocene)
   361	Ti - Intrusive rocks (Pliocene and late Miocene)
   362	Ti - Intrusive rocks (Pliocene and late Miocene)
   372	Tiu - Intrusive rocks, undivided (Tertiary)
   391	Tg - Granodiorite (Paleocene)
   411	Kc - Chignik Formation (Late Cretaceous; Maestrichtian and Campanian)
   412	Ks - Shumagin Formation (Late Cretaceous; Maestrichtian)
   413	Kh - Hoodoo Formation (Late Cretaceous; Maestrichtian and Campanian)
   414	Kc - Chignik Formation (Late Cretaceous; Maestrichtian and Campanian)
   415	Kk - Kaguyak Formation (Late Cretaceous; Maestrichtian and Campanian)
   416	Ksm - Shumagin Formation, Mudstone (Late Cretaceous; Maestrichtian)
   431	Kp - Pedmar Formation (Early Cretaceous; Albian)
   441	Khe - Herendeen Formation (Early Cretaceous; Barremian and Hauterivian)
   442	Kst - Staniukovich Formation (Early Cretaceous; Valanginian and Berriasian)
   490	KJcv - Chert and volcanic sequence (Early Cretaceous or Jurassic)
   505	Jn? - Naknek Formation (Late Jurassic; Tithonian to Oxfordian)
   510	Jn - Naknek Formation (Late Jurassic; Tithonian to Oxfordian)
   511	Jnc - Naknek Formation Chisik Conglomerate Member (Oxfordian)
   512	Jnn - Naknek Formation Northeast Creek Sandstone Member (Oxfordian)
   513	Jns - Naknek Formation Snug Harbor Siltstone Member (Kimmeridgian and Oxfordian)
   514	Jni - Naknek Formation Indecision Creek Sandstone Member (Tithonian and Kimmeridgian)
   515	Jnk - Naknek Formation Katolinat Conglomerate Member (Tithonian)
   516	Jn - Naknek Formation (Late Jurassic; Tithonian to Oxfordian)
   517	Jn - Naknek Formation (Late Jurassic; Tithonian to Oxfordian)
   518	Jn - Naknek Formation (Late Jurassic; Tithonian to Oxfordian)
   520	Js - Shelikof Formation (Middle Jurassic; Callovian)
   521	Js - Shelikof Formation (Middle Jurassic; Callovian)
   522	Js - Shelikof Formation (Middle Jurassic; Callovian)
   523	Js - Shelikof Formation (Middle Jurassic; Callovian)
   530	Jk - Kialagvik Formation (Middle and Early Jurassic; Callovian to late Toarcian)
   540	Jt - Talkeetna Formation (Early Jurassic)
   571	JPk - Kakhonak(?) Complex (Late Jurassic? to Permian?)
   591	Jgd - Granodiorite (Late? and Middle Jurassic)
   592	Jgr - Granite (Late? and Middle Jurassic)
   593	Jqd - Tonalite and quartz diorite (Late? and Middle Jurassic)
   594	Jgb - Diorite and gabbro (Late? and Middle Jurassic)
   601	Trk - Kamishak Formation (Late Triassic; Norian)
   625	Trv - Volcanic rocks (Late Triassic)
   650	Trc - Cottonwood Bay Greenstone (Late Triassic; Norian?)
   701	Pls - Limestone (Permian; early Guadalupian)
   750	Pv - Volcanic rocks (Permian?)
   800	QTc - Contact-metamorphosed rocks (early Quaternary or late Tertiary)
   1000 - 1999	Hydrothermally altered unit, rock unit = CLASS - 1,000
   2000 - 2999	Hornfelsed unit, rock unit = CLASS - 2,000

   Yage

   Minimum age of geologic unit in millions of years (Source: USGS OFR 99-317)

   Oage

   Maximum age of geologic unit in millions of years (Source: USGS OFR 99-317)

   Lith1

   General rock classification (text) (Source: USGS OFR 99-317)

   Lith2

   General rock type (text) (Source: USGS OFR 99-317)

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Wilson, F.H.
   • Detterman, R.L.
   • DuBois, G.D.
2. Who also contributed to the data set?
3. To whom should users address questions about the data?
   U.S. Geological Survey

   Attn: Frederic H. Wilson

   Geologist

   4200 University Drive

   Anchorage, AK
   

   USA

   907-786-7448 (voice)

   fwilson@usgs.gov

Why was the data set created?

This compilation was done as part of the U.S. Geological Survey's Alaska Mineral Resource Assessment project (AMRAP), whose goal was to create and assemble geologic, geochemical, geophysical, and other data in order to perform mineral resource assessments on a quadrangle, regional, or statewide basis. The digital data here was created to assist in the compilation of a regional mineral resource assessment of the Alaska Peninsula.

How was the data set created?

1. From what previous works were the data drawn?
2. How were the data generated, processed, and modified?

   Date: Unknown (process 1 of 2)

   The data was acquired in a number of ways. the Chignik and Ugashik group of quadrangles were digitized from published 1:250,000 map sheets at the EROS Data Center in Sioux Falls, South Dakota. These were edited to reflect new data. The Port Moller, Cold Bay, and Mt. Katmai groups of quadrangles were digitized from 1:63,360 scale map sheets and all maps were edited to ensure consistency.

   Date: 28-Jun-1999 (process 2 of 2)

   Creation of original metadata record Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: Nora Shew

   Geologist

   4200 University Drive

   Anchorage, AK
   

   U.S.A.

   907-561-1181 (voice)

   nshew@usgs.gov

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?
   The linework was captured by hand digitizing from hand-drawn 1:63,360- and 1:250,000-scale mylar and paper maps that were in very good condition. Vector and polygon attributes were obtained from field maps and compilations. The digital data has been visually checked and the geologic map has undergone multiple technical reviews by J.R. Riehle, J.C. Moore, and C. Molenaar.
2. How accurate are the geographic locations?
   Users of this digital geologic map should respect the intentions of the original mappers and the limitations of the map. This geologic map compilation is intended to be used at a scale of 1:250,000; it is not intended to be used at a more detailed scale.
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   The complete digital OFR contains all files needed to create the map sheet titled "Geologic map of the Alaska Peninsula, southwest Alaska."
5. How consistent are the relationships among the observations, including topology?
   The geology data sets (mkgeol, uggeol, cggeol, pmgeol, cbgeol, and krc45) are network coverages containing arcs and polygons. Each polygon has a coded attribute designating the mapped geologic unit. Faults and stratigraphic contacts are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (faults, dikes, etc.)
   The fold axes data sets (mkfld-alb, ugfld-alb, cgfld-alb, pmfld-alb, and cbfod-alb) are arc coverages. Dangling arcs are present. Folds mapped showing plunge were digitized in the direction of the plunge.

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)
   
   USGS Information Services

   Box 25286

   Denver Federal Center

   Denver, CO
   

   USA

   303-202-4200 or 1-888-ASK-USGS (voice)
2. What's the catalog number I need to order this data set? USGS OFR 99-317 (digital)
3. What legal disclaimers am I supposed to read?

   Although this data has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.

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

     Data format:	ARCE (version 7.x)
     Network links:	http://pubs.usgs.gov/of/1999/0317/

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 10-Jun-2016

Metadata author:

Peter N Schweitzer

USGS Midwest Area

Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/

Mail Stop 954

12201 Sunrise Valley Dr

Reston, VA

USA

703-648-6533 (voice)

703-648-6252 (FAX)

pschweitzer@usgs.gov

Metadata standard:

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