20241029
16342200
20260109
17314900
20260109
17314900
FALSE
GEO_PiedmontGeology
-8436795.701700
-8396061.756000
4810746.203000
4842649.635000
1
002
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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1.0
FGDC CSDGM Metadata
ItemDescription
625000
50000
dataset
Delaware Geological Survey
Delaware Geological Survey
257 Academy St.
Newark
DE
19716-7501
US
delgeosurvey@udel.edu
University of Delaware, Delaware Geological Survey
302-831-2833
Mon - Fri; 8:00am to 4:30pm EST
Delaware Geological Survey
20260109
10.2
Enterprise Geodatabase Feature Class
http://www.dgs.udel.edu
Delaware Geological Survey Piedmont Geology Layer, 2021, 1:36,000 scale
2018-05-01T05:00:00
2.0
Delaware Geological Survey
Delaware Geological Survey
257 Academy St.
Newark
DE
19716-7501
US
delgeosurvey@udel.edu
University of Delaware, Delaware Geological Survey
302-831-2833
Mon - Fri; 8:00am to 4:30pm EST
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This vector data set contains the rock unit polygons for Delaware Geological Survey Open File Report No. 54. The Piedmont rock units from Delaware Geological Survey Geologic Map No. 10 were revised in 2021 based on new rock geochemistry, geochronometric data, petrography, and recent detailed mapping. Major revisions include revising the extent of the Christianstead Gneiss and Windy Hills Gneiss; abandoning the Wissahickon Formation as originally mapped in Delaware by Bascom (1902, 1905) and Bascom et al. (1909, 1920, and 1932) and replacing it with the Mt. Cuba Gneiss, a lithodeme of the West Grove Metamorphic Suite (Bosbyshell et al., 2012, 2013, 2014, 2015), and reserving the Wissahickon Schist/Formation for the metasediments on the east side of the Wilmington Complex magmatic arc and referring to them herein as Wissahickon Formation (restricted sense); extending the Rosemont Shear Zone from Pennsylvania southwest through Delaware to Maryland separating the Mt. Cuba Gneiss and the Wilmington Complex; formally naming and describing two new units in the Wilmington Complex - the Greenville Gabbro and the Thompsons Bridge Gneiss.</SPAN></P></DIV></DIV></DIV>
Digital Geology Layer for DGS Open File Report No. 54 (Bedrock Geologic Map of the Delaware Piedmont)
surficial geology, geology, coastal plain, Piedmont geology, boundaries, environment
Delaware, New Castle County, Kent County, Sussex County
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Delaware Geological Survey (DGS) is constantly gathering data from multiple sources, interpreting the data, and reflecting its interpretations on maps. DGS's interpretations of multiple data sources are reflected in these polygons for Open File Report No. 54. Reasonable efforts have been made by DGS to verify that this map and the digital data provided herein is an accurate interpretation of the source data used in its preparation; however, this map may contain omissions and errors in scale, resolution, rectification, positional accuracy, development methodology, interpretations of source data and other circumstances. This map is also date specific and as additional data become available and as verification of source data continues, this map may be reinterpreted and updated by DGS without notification. This map was prepared for use at a scale of 1:36,000 and should not be used at larger scales for denotation of rock unit boundaries. This map should not be used for navigational, engineering, legal, or any other site-specific use. Nothing contained herein shall be deemed an expressed or implied waiver of the sovereign immunity of the State of Delaware or its duly authorized representatives, agents, or employees.</SPAN></P></DIV></DIV></DIV>
-75.375
-75.25
38.446389
38.625
0.000000
0.000000
Delaware Geological Survey
Delaware Geological Survey
This layer represents the "current thinking" of the DGS geologic staff of the bedrock geologic units. This information is important not only to geologists, but also to hydrologists who wish to understand the distribution of water resources, to engineers who need bedrock information during construction of roads and buildings, to government officials and agencies who are planning for residential and commercial growth, and to citizens who are curious about the bedrock under their homes. Formal names are assigned to all rock units according to the guidelines of the North American Stratigraphic Code 2021.
Esri ArcGIS 13.3.4.52636
0
-75.789025
-75.423106
39.839524
39.619113
Delaware
New Castle County
geology
Piedmont
external
bfd6b84d3251a8f2ff48b1cfd3302a9f1c66797a
FirstMap
State of Delaware
801 Silver Lake Blvd.
Dover
DE
19904
302-739-9500
True
FirstMap
+/- 1 foot. Drill holes and hand auger holes have been averaged together to get this value.
[ft_us]
+/- 1
+/- 20 feet. Boring sites are located on topographic base maps and aerial photography. Spot checking of these locations using GPS has verified this accuracy.
[ft_us]
+/- 20
79
EPSG
6.18.3(9.3.1.2)
GEO_PiedmontGeology
Feature Class
79
internal feature number
ESRI
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
Name
geo_unit_name
String
50
0
0
Name
DGS
Name
Age
geo_unit_age
String
50
0
0
Age
DGS
Age of feature
description
description
String
1200
0
0
Description
DGS
Description
Symbol
geo_unit_symbol
String
25
0
0
Symbol
DGS
Symbol used to show the feature
SHAPE.AREA
SHAPE.AREA
Double
0
0
0
Shape area
DGS
Calculated shape area
SHAPE.LEN
SHAPE.LEN
Double
0
0
0
Shape length
DGS
Calculated shape length
Simple
FALSE
79
TRUE
TRUE