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08551400
1.0
FGDC CSDGM Metadata
FALSE
potomac_016_rockmineralogy
002
1711150.246700
1711150.246700
299437.072900
299437.072900
1
0.000
Projected
GCS_WGS_1984
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20230601
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20230601
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FGDC
Bureau of Economic Geology
10100 Burnet Rd. Bldg. 130
Austin
TX
78729
US
8-5
20230601
ArcGIS Metadata
1.0
BEG
10100 Burnet Rd. Bldg 139
Austin
Texas
78758
US
Enterprise Geodatabase Feature Class
0.000
Potomac Rock Mineralogy
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>Several authors presented descriptions of the mineral composition of the lower Potomac interval (Anderson, 1948; Kasabach and Scudder, 1961; Gill and others, 1963; Maher and Applin, 1971; Trapp and others, 1984; Benson and others, 1985). Review of these reports indicates that the mineralogy is quite variable: Anderson (1948), Hansen (1984), and Trapp and others (1984) reported that feldspar comprises between 20 and 50 percent of the light minerals, but Gill and others (1963) and Benson and others (1985) reported that the Potomac Group sands are quartzose with very little feldspar. The lithologic descriptions of Gill and others (1963) indicate high percentages of calcite and shell fragments, but those of Anderson (1948), Trapp and others (1984), and Benson and others (1985) indicate low to moderate amounts of calcite and shell. Most reported lignite and/or glauconite. The heavy minerals typically comprise less that 1 percent (by weight) of the sand fraction and are predominantly composed of epidote, garnet, staurolite, zircon, and tourmaline. We attribute the variability in mineralogy to deposition of the sands in a variety of fluvial and deltaic environments. To typify the mineralogy, we present data from Trapp and others (1984, their table 13) in the GIS. However, the other references cited earlier provide additional information.</SPAN></P></DIV></DIV>
Rock Mineralogy for Potomac
Gill, H. E., Seabar, P. R., Vecchioli, J., and Anderson, H. R., 1963, Evaluation of geologic and hydrologic data from the test-drilling program at Island Beach State Park, N.J.: New Jersey Department of Conservation and Economic Development, Water Resources Circular 12, 25 p.
*
Hansen, H. J., 1984, Hydrogeologic characteristics of the Waste Gate Formation, a new subsurface unit of the Potomac Group underlying the eastern Delmarva Peninsula: Maryland Geological Survey Information Circular 39, 22 p.
*
Trapp, H., Jr., Knobel, L. L., Meisler, H., and Leahy, P. P., 1984, Test well DO-CE 88 at Cambridge, Dorchester County, Maryland: U.S. Geological Survey, Water-Supply Paper 2229, 48 p.
New Jersey
Delaware
Maryland
Lower Potomac Group
Lower Potomac Group
Maryland
Delaware
New Jersey
Access constraints: Restriction Code: other restrictions; Other Constraints: Access constraints: None
See access and use constraints information.
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potomac_016_rockmineralogy
Feature Class
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OBJECTID
OBJECTID
OID
4
10
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Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
8
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Feature geometry.
ESRI
Coordinates defining the features.
DEPTH
DEPTH
Integer
4
10
0
FRAGME_PER
FRAGME_PER
Double
8
38
8
QZCOMM
QZCOMM
Integer
4
10
0
QZPOLICRI
QZPOLICRI
Integer
4
10
0
KFELD_PER_
KFELD_PER_
Integer
4
10
0
PLAGIO_PER
PLAGIO_PER
Double
8
38
8
ILMENITE_P
ILMENITE_P
Double
8
38
8
BROWNILMEN
BROWNILMEN
Double
8
38
8
LEUCOXENE_
LEUCOXENE_
Double
8
38
8
HORNBLENDA
HORNBLENDA
String
14
0
0
EPIDOTA_PE
EPIDOTA_PE
Double
8
38
8
GARNET_PER
GARNET_PER
Double
8
38
8
CHLORITOID
CHLORITOID
Double
8
38
8
GLAUCONITE
GLAUCONITE
Double
8
38
8
STAUROLITE
STAUROLITE
Double
8
38
8
KYANITE_PE
KYANITE_PE
Double
8
38
8
SILLIMANIT
SILLIMANIT
Double
8
38
8
TOURMALINE
TOURMALINE
Double
8
38
8
RUTILE_PER
RUTILE_PER
Integer
4
10
0
source_organization
Source Organization
String
255
0
0
hyperlink
Link
String
255
0
0
resource_date
Date of Resource
String
255
0
0
ZIRCON_PER
ZIRCON_PER
Integer
4
10
0
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