Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Geologic Map of the Anchorage C-7 NE Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-24
Fairbanks, Alaska - USA
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
sheet 1 of 2, scale 1:25,000
http://dx.doi.org/10.14509/2507
This map is one of a series of four 1:25,000-scale quadrangle maps (Anchorage C-7 NE Quadrangle) intended to provide information on the geology and construction materials along the southern margin of the Talkeetna Mountains between Little Susitna River and Nancy Lake, Alaska. Additionally, the geologic map portrays faults, if present, as well as other lineaments that represent either faults or erosional features.
This series of maps supplements an earlier series of similar maps for the adjacent area to the south between Palmer and Big Lake. A separate geologic-materials map was developed to show the probable distribution of materials with certain ranges of grain sizes, and their relative abundance, because the area is rich in geologic materials that may be useful for construction. It is an important source of construction aggregates for the region, because of extensive glaciofluvial deposits in the area. Additionally, the Castle Mountain fault, which is known to be active, traverses the area of the current series of maps. Although the fault is easily distinguishable in areas immediately to the east and west of the area mapped in this series, it is largely obscured here by surficial deposits and vegetation. We present on these maps the best known surface evidence for faults and possibly fault-related lineaments.
The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "RI1994-24-27_codeset.pdf." Layers include:
>ancc7neflt2_arc fault location traces and types
>ancc7negeo2_arc geologic unit boundaries (arc)
>ancc7negeo2_polygon geologic units (polygon)
>ancc7nesack2_arc sackung failure in bedrock (arc)
>ancc7nesack2_polygon sackung failure in bedrock (polygon)
>c7nedip_point point attribute table that displays strike and dip information
1980
1994
publication date
None planned
-149.44735116
-149.24082011
61.75321519
61.62177876
ISO 19115 Topic Category
geoscientificInformation
none
Construction Materials
Geology
none
Alaska, State of
Anchorage Quadrangle
Castle Mountain
Southcentral Alaska
none
Arkose Ridge Formation
Castle Mountain Fault
Tyonek Formation
none
Early Jurassic
Holocene
Late Cretaceous
Mesozoic
Pleistocene
Quaternary
Tertiary
This report, map, and/or data set are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Any hard copies or published data sets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these data sets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
GIS Data Manager/Cartographer
mailing and physical address
3354 College Road
Fairbanks
AK
99709-3707
USA
(907) 451-5029
(907) 451-5020
(907) 451-5050
dggspubs@alaska.gov
You may view our web site at http://www.dggs.alaska.gov for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.
Preparation of these maps was supported in part by the U.S. Geological Survey through the STATEMAP component of the National Cooperative Geologic Mapping Program.
Additional Acknowledgments: Field assistance provided by Cheri Daniels, Kristin Kline, and Gina Cruse. Reviewed by Jim Clough and Jeff Kline.
Microsoft Windows XP SP2, ArcGIS 9.+, and any text editor.
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Derivative Materials Map of the Anchorage C-7 NE Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-24
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 2 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2507
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Geologic Map of the Anchorage C-7 NW Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-25
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 1 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2508
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Derivative Materials Map of the Anchorage C-7 NW Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-25
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 2 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2508
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Geologic Map of the Anchorage C-8 NE Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-26
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 1 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2509
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Derivative Materials Map of the Anchorage C-8 NE Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-26
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 2 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2509
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Geologic Map of the Anchorage C-8 NW Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-27
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 1 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2510
Reger, R.D.
Combellick, R.A.
Pinney, D.S.
1994
Derivative Materials Map of the Anchorage C-8 NW Quadrangle, Alaska
tabular digital data, map, vector digital data
Report of Investigation
RI 94-27
Fairbanks, AK
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Sheet 2 of 2 sheets, scale 1:25,000
http://dx.doi.org/10.14509/2510
Geologic point, line, and polygon data were determined in the field using 1:63,360-scale topographic maps and 1:50,000 (nominal) scale, color-infrared aerial photographs. The surficial-geologic information was transferred from acetate air-photo overlays to a paper 1:63,360-scale USGS topographic base using a zoom transfer scope. The surficial-geologic information was then digitized into Arc/Info GIS (ArcEdit module) using a large-format digitizing table with RMS registration errors constrained to be no larger than 0.003 inches (input coverage units) for each digitizing session. Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section.
Polygon topology present and clean on appropriate data. Other data are line, point, or annotation data and do not require topologic relationships. Chain-node topology present.
This dataset includes geospatial information related to geologic units, age and field sample locations, structural features, structural measurements, and fault locations.
Location data were determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, and color-infrared aerial photographs.
10
Surficial-geologic map data have a horizontal positional accuracy dependent on: (1) the 1:50,000-scale (nominal) aerial photographs on which they are based, with an estimated potential error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; (2) the accuracy of the human zoom transfer scope operator in tracing the linework from acetate overlays to topographic base maps, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; (3) the accuracy of the zoom transfer process itself, error magnitude highly variable and unknown but potentially large; (4) the digitizing RMS error of 0.003 inches [input coverage units], which equates to approximately 5 meters on the ground for a 1:63,360-scale map; and (5) the accuracy of the human operator digitizing the geologic linework from the topographic base maps, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground. Total potential horizontal error for surficial-geologic map features is therefore estimated to be approximately 10 meters.
Clardy, B.I.
1984
Bedrock Geologic Features of the Matanuska Valley
paper
p. 33-44, 1 sheet, scale 1:96,000
Clardy, B.I.
Hanley, P.T.
Hawley, C.C.
LaBelle, J.C.
1984
Guide to the Bedrock and Glacial Geology of the Glenn Highway, Anchorage to the Matanuska Glacier and the Matanuska Coal Mining District
map
Anchorage, AK, USA
Alaska Geological Society
96000
Map and report
1984
publication date
Clardy (1984)
See this publication cited in the Process Step section below.
Csejtey Jr., B.
Evarts, R.C.
1979
Serpentinite Bodies in the Willow Creek District, Southwestern Talkeetna Mountains, Alaska
Report
U.S. Geological Survey Circular
804B
Washington D.C., Maryland
United States Government Printing Office
p. 92-93
Johnson, K.M. (ed.)
Williams, J.R. (ed.)
1979
The United States Geological Survey in Alaska: Accomplishments During 1978
map
paper
1979
publication date
Csejtey and others (1979)
See this publication cited in the Process Step section below
Csejtey Jr., B.
Nelson, W.H.
Jones, D.L.
Silberman, N.J.
Dean, R.M.
Morris, M.S.
Lanphere, M.A.
Smith, J.G.
Silberman, M.L.
1978
Reconnaissance Geologic Map and Geochronology, Talkeetna Mountains Quadrangle, Northern Part of Anchorage Quadrangle, and Southwestern Corner of Healy Quadrangle, Alaska
Map and report
U.S. Geological Survey Open-File Report
78-558A
60 pp., 1 sheet, scale 1:250,000
250000
paper
1978
publication date
Csejtey and others (1978)
See this publication cited in the Process Step section below
Csejtey Jr., B.
Smith, J.G.
1975
Petrography, Tentative Age, and Correlation of Schist, Willow Creek, Talkeetna Mountains, Southern Alaska
Map and report
U.S. Geological Survey Circular
722
p. 48
Yount, M.E. (ed.)
1975
United States Geological Survey Alaska Program, 1975
map
paper
1975
publication date
Csejtey and others (1975)
See this publication cited in the Process Step section below
Madden, D.J.
Silberman, M.L.
Morre-Nall, A.
1987
Ages and Geologic Relationships in the Willow Creek Gold Mining District, Southwestern Talkeetna Mountains, Southern Alaska
Report
U.S. Geological Survey Open-File Report
87-143
12 pp.
paper
1987
publication date
Madden and others (1987)
See this publication cited in the Process Step section below
Magoon, L.B.
Adkison, W.L.
Egbert, R.M.
1976
Map Showing Geology, Wildcat Wells, Tertiary Plant Fossil Localities, K-Ar Age Dates, and Petroleum Operations, Cook Inlet Area, Alaska
Map
U.S. Geological Survey Miscellaneous Investigations Map
I-1019
3 sheets, scale 1:250,000
250000
paper
1976
publication date
Magoon and others (1976)
See this publication cited in the Process Step section below
Ray, R.G.
1954
Geology and Ore Deposits of the Willow Creek Mining District, Alaska
report
U.S. Geological Survey Bulletin
1004
86 pp.
paper
1954
publication date
Ray (1954)
See this publication cited in the Process Step section below
Silberman, M.L.
OLeary, R.M.
Csejtey Jr., B.
Smith, J.G.
Connor, C.L.
1978
Geochemical Anomalies and Isotopic Ages in the Willow Creek Mining District, Southwestern Talkeetna Mountains, Alaska
Report
U.S. Geological Survey Open-File Report
78-223
33 pp.
paper
1978
publication date
Silberman and others (1978)
See this publication cited in the Process Step section below
Winkler, G.R.
1992
Geologic Map and Summary Geochronology of the Anchorage 1° x 3° Quadrangle, Southern Alaska
Map
U.S. Geological Survey Miscellaneous Investigations Map
I-2283
1 sheet, scale 1:250,000
250000
paper
1992
publication date
Winkler (1992)
See this publication cited in the Process Step section below
Geologic map preparation - Data collection for this series of maps took place over approximately a 15-year period from 1980 to 1994. The geologic map was developed by first interpreting landforms and photolineaments on color and false-color infrared photographs. These deposits and features were then verified, described, and sampled during field inspections. Additionally, information on bedrock geology was compiled from the literature and verified and mapped in the field. Finally, the bedrock and surficial geology were combined into a single draft map and digitized. The geologic-materials map was derived digitally from the geologic map on the basis of field observations that indicate that each geologic unit has a definite composition or range of composition. Therefore, the delineation of materials units was interpreted from the geologic map by using a simple conversion matrix to combine and translate geologic units into materials units. Much of the initial landform interpretation and mapping of geologic contacts and lineaments resulted from analysis of color and false-color infrared vertical aerial photographs. Color aerial photographs used in this interpretation were taken in 1973, 1981, 1982, and 1986 at scales of 1:12,000, 1:18,000, and 1:24,000. False-color infrared images were collected by NASA in 1984 and 1993 at a scale of approximately 1:60,000. Bedrock-geologic data were compiled from the following sources: Clardy (1984), Csejtey and others (1978), Csejtey and others (1979), Csejtey and Smith (1975), Madden and others (1987), Magoon and others (1976), Ray (1954), Silberman and others (1978), and Winkler (1992). Field work was conducted in 1980, 1981, 1988, 1993, and 1994 to verify photointerpretation, map bedrock-unit contacts, and examine the deposits to accurately describe their content. Finally, the draft geologic map units were digitized using geographic information system (GIS) software. The resulting polygons were assigned appropriate colors, labeled, and layered with a digital image of the corresponding U.S. Geological Survey topographic quadrangle map to produce the published geologic map. The USGS topographic base map was produced in 1979 and revised in 1993.
Clardy (1984)
Csejtey and others (1978)
Csejtey and others (1979)
Csejtey and Smith (1975)
Madden and others (1987)
Magoon and others (1976)
Ray (1954)
Silberman and others (1978)
Winkler (1992)
1994
Universal Transverse Mercator
6
0.999600
-147.000
0
500000
0
coordinate pair
0.000032
0.000032
meters
ancc7negeo2_arc
Universal Transverse Mercator
6
0.999600
-147.000
0
500000
0
coordinate pair
0.000032
0.000032
meters
ancc7negeo2_polygon
Universal Transverse Mercator
6
0.999600
-147.000
0
500000
0
coordinate pair
0.000016
0.000016
meters
ancc7neflt2_arc
Universal Transverse Mercator
6
0.999600
-147.000
0
500000
0
coordinate pair
0.000016
0.000016
meters
c7nedip_point
Universal Transverse Mercator
6
0.999600
-147.000
0
500000
0
coordinate pair
0.000016
0.000016
meters
ancc7nesack2_arc
Universal Transverse Mercator
6
0.999600
-147.000
0
500000
0
coordinate pair
0.000016
0.000016
meters
ancc7nesack2_polygon
D_Clarke_1866
Clarke 1866
6378206.4
294.978698
ancc7negeo2_arc.shp
Object type is vector, there are 827 rows associated with this entity, and the entity values refer to geologic map unit contacts.
Alaska Division of Geological & Geophysical Surveys
ancc7negeo2_arc
CODE
Line symbol for geologic map unit contacts
Alaska Division of Geological & Geophysical Surveys
1
Contact
Alaska Division of Geological & Geophysical Surveys
0
Disregard. Drawing line.
Alaska Division of Geological & Geophysical Surveys
ancc7negeo2_polygon.shp
Object type is vector, there are 346 rows associated with this entity, and the entity values refer to the unit name abbreviations for each specific polygon represented on the map.
Alaska Division of Geological & Geophysical Surveys
ancc7negeo2_polygon
UNIT
A unique three to four letter abbreviation given to each map unit represented on the map. Any unit ending with a "?" indicates uncertainty.
Alaska Division of Geological and Geophysical Surveys
RI1994-24-27_codeset.pdf
Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1994-24-27_codeset.pdf
MAT
A unique three letter abbreviation given to each materials unit represented on the map. Materials units imply a hazards classification.
Alaska Division of Geological and Geophysical Surveys
RI1994-24-27_codeset.pdf
Alaska Division of Geological & Geophysical Surveys http://www.dggs.alaska.gov/metadata/RI1994-24-27_codeset.pdf
ancc7neflt2_arc.shp
Object type is vector, there are 45 rows associated with this entity, and the entity values refer to fault location traces and types.
Alaska Division of Geological & Geophysical Surveys
ancc7neflt2_arc
CODE
Types of faults found in the map area.
Alaska Division of Geological and Geophysical Surveys
1
Contact
Alaska Division of Geological & Geophysical Surveys
2
Contact, approximate
Alaska Division of Geological & Geophysical Surveys
3
Scarp, barb on lower side
Alaska Division of Geological & Geophysical Surveys
5
Trough, may be ice-marginal channel at lower elevations
Alaska Division of Geological & Geophysical Surveys
6
Photolineament with no topographic expression evident in aerial photographs. Generally visible as a color or density contrast in vegetation.
Alaska Division of Geological & Geophysical Surveys
c7nedip_point.shp
Object type is point, there are 116 rows associated with this entity, and the entity values refer to symbols for strike and dip information.
Alaska Division of Geological & Geophysical Surveys
c7nedip_point
DIP
Represents the dip angles used to produce the dip directions.
Alaska Division of Geological and Geophysical Surveys
0
90
CODE
Represents the symbols used to describe the strike and dips of beds and foliation.
Alaska Division of Geological and Geophysical Surveys
1
Strike and dip of foliation. Also shown as SYMBOL=105.
Alaska Division of Geological & Geophysical Surveys
2
Dip is equal to zero. Also shown as SYMBOL=112.
Alaska Division of Geological & Geophysical Surveys
3
Strike and dip of beds. Also shown as SYMBOL=101.
Alaska Division of Geological & Geophysical Surveys
0
Disregard. Drawing line.
Alaska Division of Geological & Geophysical Surveys
SYMBOL
Represents the symbols used to describe the strike and dips of beds and foliation.
Alaska Division of Geological and Geophysical Surveys
101
Strike and dip of beds. Also shown as CODE=3.
Alaska Division of Geological & Geophysical Surveys
105
Strike and dip of foliation. Also shown as CODE=1.
Alaska Division of Geological & Geophysical Surveys
112
Dip is equal to zero. Also shown as CODE=2.
Alaska Division of Geological & Geophysical Surveys
X-COORD
Represents the X-coordinates in UTM for each strike and dip location.
Alaska Division of Geological and Geophysical Surveys
371293.94
380171.41
meters
Y-COORD
Represents the Y-coordinates in UTM for each strike and dip location.
Alaska Division of Geological and Geophysical Surveys
6844778.86
6848434.62
meters
ancc7nesack2_arc.shp
Object type is vector, there are 148 rows associated with this entity, and the entity values refer to polygons showing sackung failure in bedrock.
Alaska Division of Geological & Geophysical Surveys
ancc7nesack2_arc
CODE
Represents the areas of the sackung failures in bedrock.
Alaska Division of Geological and Geophysical Surveys
0
Disregard. Drawing line for boundary.
Alaska Division of Geological & Geophysical Surveys
1
Polygon showing extent of sackung.
Alaska Division of Geological & Geophysical Surveys
2
Arrow indicating general direction of downslope movement of sackung.
Alaska Division of Geological & Geophysical Surveys
ancc7nesack2_polygon.shp
Object type is vector, there are 29 rows associated with this entity, and the entity values refer to polygons showing sackung failure in bedrock. Note: This feature wasn't assigned any user defined attribute. Sackung feature shown on map as polygon outline filled with stippled pattern.
Alaska Division of Geological & Geophysical Surveys
ancc7nesack2_polygon
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Natural Resource Technician
mailing and physical
3354 College Road
Fairbanks
AK
99709-3707
USA
907-451-5020
None available.
907-451-5050
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays
Please view our web site (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
Report of Investigation 94-24
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.
Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
Printed publication can be purchased for $20.50 (contact information below) plus shipping if mailed.
PDF
1.6
No compression applied
http://dx.doi.org/10.14509/2507
ArcGIS Shapefile
ESRI ArcGIS 9.x
No compression applied
http://dx.doi.org/10.14509/2507
CD-ROM
Joliet
Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files.
Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (http://www.dggs.alaska.gov/) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard.
Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid.
Please check the MapInfo web site (http://www.mapinfo.com/) for the latest documentation on importing ESRI shape files.
20080506
20080506
20090305
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
mailing and physical address
3354 College Road
Fairbanks
AK
99709-3707
USA
907-451-5039
907-451-5050
dggspubs@alaska.gov
8 am to 4:30 pm, Monday through Friday, except State holidays.
Please contact us through the e-mail address above whenever possible.
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
none
If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.