Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: G.J. Walsh
Originator: R.B. Scott
Originator: J.N. Aleinikoff
Originator: T.R. Armstrong
Publication_Date: 2009
Title:
Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: U.S. Geological Survey Scientific Investigations Map
Issue_Identification: 3052
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Online_Linkage: <https://pubs.usgs.gov/sim/3052/>
Description:
Abstract:
The bedrock geology of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut is described in this report. The database includes contacts of bedrock geologic units, faults, outcrops, and structural geologic information.
Purpose:
The map was published as part of a study of fractured bedrock aquifers. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information.
Supplemental_Information:
Data were originally collected in UTM coordinates, zone 18, NAD 1927, and reprojected to polyconic projection, NAD 1927, in meters. The database is accompanied by two large format color maps, an explanatory pamphlet, and a readme.txt file.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2001
Ending_Date: 2009
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -72.3750
East_Bounding_Coordinate: -72.2500
North_Bounding_Coordinate: 41.3750
South_Bounding_Coordinate: 41.2500
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: geology
Theme_Keyword: geologic
Theme_Keyword: bedrock
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Connecticut
Place_Keyword: Old Lyme
Place_Keyword: New London
Place_Keyword: Middlesex
Access_Constraints:
Although all data released in this report have 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 and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Gregory J. Walsh
Contact_Position: geologist
Contact_Address:
Address_Type: mailing and physical address
Address: P.O. Box 628
City: Montpelier
State_or_Province: Vermont
Postal_Code: 05602
Country: USA
Contact_Voice_Telephone: 802-828-4528
Contact_Facsimile_Telephone: 802-828-4465
Contact_Electronic_Mail_Address: gwalsh@usgs.gov
Native_Data_Set_Environment: Arc/Info coverage format
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
All attributes digitized during the creation process were verified by displaying the lines and points in the database with respect to the USGS 7.5-minute topographic map, but no formal tests were performed.
Logical_Consistency_Report:
These data are believed to be logically consistent, although no tests were performed. Line geometry is topologically clean.
Completeness_Report:
The geologic contacts were delineated on a USGS 7.5-minute topographic map based on observations at the outcrops shown in the database. Not all outcrops within the area were identified or visited during mapping. The geologic contacts might change if additional outcrops are discovered or exposed as the natural land changes or as the result of development. The features in the database are not based on legal parcels or definitions.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The data were created on a USGS 7.5 minute topographic map at 1:24000 scale. Therefore, the horizontal accuracy is assumed to be within National Map Accuracy Standards, with a horizontal accuracy of 45.6 feet at the 95% confidence level. Locational information in the field was provided by general purpose hand-held GPS receivers using the code correlation method Rockwell PLGR+96 GPS receivers using the Federal precise positioning service. GPS positions were adjusted to match the existing topographic base. Raw GPS data are located in the STRUX point coverage.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The data were delineated on a USGS 7.5 minute topographic map at 1:24000 scale. Therefore, the vertical accuracy is assumed to be within National Map Accuracy Standards, with a vertical accuracy of 11.9 feet at the 95% confidence level.
Lineage:
Process_Step:
Process_Description:
Geology mapped at a scale of 1:24,000. Location information was provided by general purpose hand-held GPS receivers or Rockwell PLGR+96 GPS receivers using the Federal precise positioning service. The line and polygon data were compiled on a Mylar greenline and scanned at 400 dpi. The raster files (TIF) were converted to vector files (DXF) using raster-to-vector conversion software. The vector files were imported to Arc/Info version 8.3. Point data were collected with GPS and hand-held 3COM Palm Pilot III PDA computers. Data from the PDAs and GPS receivers were combined in ArcView version 3.3, converted into shapefiles, and then imported into Arc/Info. Database files were edited as overages in Arc/Info and later converted to shapefiles.
Process_Date: 2009
Source_Produced_Citation_Abbreviation: Walsh and others (2009)
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Gregory J. Walsh
Contact_Position: geologist
Contact_Address:
Address_Type: mailing and physical address
Address: P.O. Box 628
City: Montpelier
State_or_Province: Vermont
Postal_Code: 05602
Country: USA
Contact_Voice_Telephone: 802-828-4528
Contact_Facsimile_Telephone: 802-828-4465
Contact_Electronic_Mail_Address: gwalsh@usgs.gov
Hours_of_Service: 0900 to 1700 eastern standard time
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 186
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: .0001
Longitude_Resolution: .0001
Geographic_Coordinate_Units: Decimal Degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The geologic data layers in the GIS database of this report include, 1) CONTX - Polygon data layer of bedrock geologic map units, including a lithology attribute table, 2) FAULTS - Line data layer of geologic faults, 3) OUTCROP - Unattributed polygon data layer of bedrock outcrops, and 4) STRUX - Point data layer of ductile and brittle structural geology.
Entity_and_Attribute_Detail_Citation: <https://pubs.usgs.gov/sim/3052/Downloads/readme.txt>
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - Information Services
Contact_Address:
Address_Type: mailing and physical address
Address: Box 25286, Denver Federal Center
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS
Contact_Electronic_Mail_Address: ask@usgs.gov
Hours_of_Service: 0900 to 1700 mountain standard time
Resource_Description: USGS Scientific Investigations Map 3052
Distribution_Liability:
These data were prepared by an agency of the United States Government. Neither the U.S. Government, the Department of the Interior, nor the U.S. Geological Survey, 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. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Arc/Info export
Format_Version_Number: 9.x
Format_Information_Content: Geologic units and structural features
File_Decompression_Technique: unzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/sim/3052/downloads/SIM3052A.zip>
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: 1.0
Format_Information_Content: Geologic units and structural features
File_Decompression_Technique: unzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/sim/3052/downloads/SIM3052A.zip>
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20091030
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Gregory J. Walsh
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and physical address
Address: P.O. Box 628
City: Montpelier
State_or_Province: Vermont
Postal_Code: 05602
Country: USA
Contact_Voice_Telephone: 802-828-4528
Contact_Facsimile_Telephone: 802-828-4465
Contact_Electronic_Mail_Address: gwalsh@usgs.gov
Hours_of_Service: 0900 to 1700 eastern standard time
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.8 on Thu Nov 05 08:45:40 2009