20241029
16342100
20260109
17310000
20260109
17310000
FALSE
GEO_OffshoreGeology
-8360049.163300
-8335030.066800
4642996.760100
4694052.222200
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, Univ of DE, Delaware Geological Survey Bldg
Newark
DE
19716-7501
US
delgeosurvey@udel.edu
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 Offshore Geology Layer, 2020, 1:40,000 scale
2018-05-01T05:00:00
2.0
Delaware Geological Survey
Delaware Geological Survey
257 Academy St, Univ of DE, Delaware Geological Survey Bldg
Newark
DE
19716-7501
US
delgeosurvey@udel.edu
302-831-2833
Mon - Fri; 8:00am to 4:30pm EST
<DIV STYLE="text-align:Left;"><P><SPAN>Surface geologic units have been mapped across the inner continental shelf off Delaware, from the shoreline to ~10 miles from shore (Federal waters). The coverage area spans from the Hen and Chickens Shoal (in the north) to the Fenwick Shoal (in the south). Mapping relied on lithologic descriptions of the surface interval (defined as the upper foot in core) from over 450 DGS offshore sediment cores. This dataset was supplemented with high-resolution sub-surface 'chirper' seismic reflection imagery and 2007 hydrographic data (USGS/NOAA). Seafloor topography was useful in the delineation process as it provided information on the bounds and extents of respective geologic map units sampled in core. These units are as follows, established based on textural criteria, color, fossil content, and correlation to established onshore geologic units (Ramsey, 2010): Qets = ebb-tidal delta sand deposits affiliated with the Indian River Inlet, Qns = nearshore deposits, Qfs = finger shoal deposits (shore-attached and shore-oblique), Qsl = shoal deposits (affiliated with the Hen and Chickens sand body), Qss = sheet sand deposits, Qis = inter-shoal deposits (generally found surrounding the distal end of the Hen and Chickens Shoal), Ql = lagoonal deposits, Qrl = ravinement lag deposits, Qms = Marine shelf deposits (which form a SE-ward thickening wedge within the southern portion of the DE shelf), Qlh = Lynch Heights Formation (a Pleistocene bay-margin deposit), Qsi = Sinepuxent Formation (a Pleistocene lagoonal unit), Qo = Omar Formation (a mid-Pleistocene, muddy to sandy valley fill deposit), and Tbd = Beaverdam Formation (late Pliocene to early Pleistocene fluvio-deltaic sediments)</SPAN></P></DIV>
Delaware Geological Survey Offshore Geology Layer, 2020, 1:40,000 scale
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. Geologic information included in this GIS layer is the result of DGS's interpretations of multiple data sources. Reasonable efforts have been made by DGS to verify that this layer and the digital data provided herein accurately interpret the current understanding of the surface geology of the Delaware continental shelf; however, this means that this layer may differ from previously DGS published subsurface geologic maps. This digital raster file may also contain errors in positional accuracy, development and methodology, interpretations of source data, and other circumstances. The information is also date specific and as additional data become available and as verification of source data continues, the geologic information contained herein may be reinterpreted and updated by DGS without notification. These data 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 University of Delaware and the State of Delaware or their duly authorized representatives, agents, or employees.</SPAN></P></DIV></DIV></DIV>
-75.375
-75.25
38.446389
38.625
0.000000
0.000000
This file was generated to illustrate sediment-facies distributions across the inner continental shelf of Delaware. It delineates surface geologic units mapped from core information housed with the Delaware Geological Survey (DGS), seafloor topography (2015 USGS/NOAA dataset), and seismic subsurface reflection imagery (BOEM dataset collected by CB&I in 2015). This product represents the "current thinking" of the DGS staff regarding the surficial geology of the Delaware shelf. This product is explained in detail in DGS product ‘Geologic Map of Offshore Delaware’ (Geologic Map Series 25), by Mattheus et al. (2020).
Esri ArcGIS 13.3.4.52636
0
-75.099599
-74.874849
38.806921
38.448625
Delaware
offshore
Delaware Geological Survey
Delaware Geological Survey
257 Academy St, Univ of DE, Delaware Geological Survey Bldg
Newark
DE
19716-7501
US
delgeosurvey@udel.edu
302-831-2833
Mon - Fri; 8:00am to 4:30pm EST
Delaware Geological Survey
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
169
EPSG
6.18.3(9.3.1.2)
GEO_OffshoreGeology
Feature Class
169
internal feature number
ESRI
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
NAME
geo_unit_name
String
50
0
0
Name
DGS
Name of feature
AGE
geo_unit_age
String
50
0
0
Age
DGS
Age of feature
Shape
Shape
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
SYMBOL
geo_unit_symbol
String
25
0
0
Symbol
DGS
Symbol used to identify the feature
RESOURCEPOTENTIAL
resource_p
String
50
0
0
Resource potential
DGS
Resource potential
description
description
String
1200
0
0
Description
DGS
Text description of 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
169
TRUE
TRUE