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NGMDB
Geologic Unit: Nassau
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Map showing publication footprint
  • Usage in publication:
    • Nassau beds
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Quartzite
  • AAPG geologic province:
    • New England province
Publication: Summary:

Pg. 69-70. Nassau beds. [Are] Divisions A to E of [T.N.] Dale's [1904] series in Rensselaer County, eastern New York. Consists of 150 to 800 feet of alternating reddish and greenish shales and quartzites, underlying Bomoseen grit; all Lower Cambrian.
Named for exposures in Nassau, Rensselaer Co., eastern NY.

Source: US geologic names lexicon (USGS Bull. 896, p. 1464); supplemental information from GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau quartzite
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • New England province
Publication: Summary:

Revised as Nassau quartzite. This formation, as well as other basal quartzites of older parts of Appalachian geosyncline, is unfossiliferous. It is probable that Nassau and other basal quartzites are Precambrian south of Random quartzite in Newfoundland, eastern Canada.

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau formation
  • Modifications:
    • Revised
    • Areal extent
  • AAPG geologic province:
    • New England province
Publication: Summary:

Extended into west-central VT in Castleton quad as the Nassau formation. Crops out in Taconic Range and slate belt. Previously mapped as Upper Ordovician Berkshire schist but now called late Precambrian Nassau formation because of its relation to Cambrian slates of slate belt and similarity to Nassau formation in NY. Probably does not include Schodack, Eddy Hill, or Zion Hill strata in this area.

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • New England province
Publication: Summary:

Age of Nassau formation is Early Cambrian in this report.

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau Formation*
  • Modifications:
    • Revised
    • Age modified
    • Areal extent
  • AAPG geologic province:
    • New England province
Publication: Summary:

Geographically extended from eastern NY into northwestern MA. Age changed from Early Cambrian to late Precambrian(?) and (or) Early Cambrian(?). Considered a probable lateral facies of the probable late Precambrian and (or) Early Cambrian Everett Formation. Rensselaer Graywacke Member is tentatively assigned (with a query on map) to the Nassau Formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau Formation*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
Publication: Summary:

Used as Nassau Formation of Proterozoic Z and Early Cambrian. Map also covers areas of immediately adjacent east-central NY and southwestern VT. Main body of Nassau Formation mapped in NY and MA includes Bomoseen Graywacke Member and Zion Hill Quartzite Member. Rensselaer Graywacke Member mapped separately in NY and MA. Mettawee Member of Nassau is mapped in NY, MA, and VT. [No explanation given for change in age or reduction on rank of Mettawee.]

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • New England province
Publication: Summary:

Late Proterozoic Nassau Formation is basal part of Taconic allochthon sequence in Glens Falls quad. Includes Bomoseen Graywacke Member and Zion Hill Quartzite Member (exposed on Bird Mountain, VT), and Rensselaer Graywacke Member (exposed just south of quad boundary). Overlain by Cambrian Browns Pond Formation. [No explanation for Late Proterozoic age instead of currently accepted Late Proterozoic and Early Cambrian age used in 1980's by other workers.]

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
Map showing publication footprint
  • Usage in publication:
    • Nassau Formation*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • New England province
Publication: Summary:

Phyllites of Brodie Mountain area on this map are coextensive with phyllites called Nassau Formation in Giddings Brook slice in the Hoosic Falls area (Potter, 1972) and the Perry Peak slice and Chatham slice in the State Line quad (Ratcliffe, 1974). Therefore, greenish phyllites on Brodie Mountain are referred to here as schist of the Nassau(?) Formation.

Source: GNU records (USGS DDS-6; Reston GNULEX).

NGMDB
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For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).

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