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Twin Springs Quarry

Past Producer in Dubuque county in Iowa, United States with commodity Phosphorus-Phosphates
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Host and associated rocks
  7. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Links to other databases
  10. Bibliographic references
  11. General comments
  12. Reporter information

Geologic information

Identification information

Deposit ID 10082055
MRDS ID W044564
Record type Site
Current site name Twin Springs Quarry

Geographic coordinates

Geographic coordinates: -90.84985, 42.52029 (WGS84)

Site location context

Political divisions (FIPS codes)

Dubuque(county)

Iowa(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sherrill(quadrangle 1:24,000 scale)

Dubuque North(quadrangle 1:100,000 scale)

Dubuque(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Grant-Little Maquoketa(hydrologic unit)

Upper Mississippi-Maquoketa-Plum(hydrologic accounting unit)

Upper Mississippi-Maquoketa-Plum(hydrologic subregion)

Upper Mississippi(hydrologic region)

Geographic areas

Country State County
United States Iowa Dubuque

Commodities

Commodity Importance
Phosphorus-Phosphates Primary

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Maquoketa Shale
    Rock description Maquoketa Shale
    Stratigraphic age (youngest) Late Ordovician

Nearby scientific data

(1) -90.84985, 42.52029
ListMap

Economic information

Comments on the geologic information

  • PHOSPHATIC SILTSTONE BED 1.1' THICK LIES ON GALENA DOLOMITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Significant No

Reference information

Bibliographic references

  • Deposit

    F1 < BROWN, C.E., 1966, PHOSPHATE DEPOSITS IN THE BASAL BEDS OF THE MAQUOQUETA SHALE NEAR DUBUQUE, IOWA, IN GEOLOGICAL SURVEY RESEARCH 1966: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 550-B, P. B152-B158.

  • Deposit

    F2 < BROWN, C. E., 1974, PHOSPHATIC ZONE IN THE LOWER PART OF THE MAQUOKETA SHALE IN NORTHEAST IOWA: U.S. GEOLOGICAL SURVEY JOURNAL OF RESEARCH, V. 2, NO. 2, P. 219-232.

General comments

Subject category Comment text
Deposit GEN<BROWN (1966) LOCALITY 5, QUARRY, UPPER FEW FEET OF FACE. PHOSPHATIC SHALE, 1.1' 7.9% P2O5. CADASTRAL LOCATION: SW 1/4 SEC. 16, T. 89 N., R. 1 E. ; INFO.SRC : COBB

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1985 Miller, M. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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