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Geologic Unit: Head
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Map showing publication footprint
  • Usage in publication:
    • Head member
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Siltstone
    • Argillite
  • AAPG geologic province:
    • New England province
Publication:

Oxley, Phillip, and Kay, G.M., 1959, Ordovician Chazyan Series of Champlain Valley, New York and Vermont, and its reefs: American Association of Petroleum Geologists Bulletin, v. 43, no. 4, p. 817-853. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Named the Head member of the Day Point formation in VT and northeastern NY for The Head, Isle La Motte, northwestern VT. Consists of dark-gray, greenish-tinged dense fine calcareous quartz sandstone to siltstone and interbedded silty argillite that disconformably overlies the Bridport dolomite south of Scott Point, Isle La Motte; proportion of shaly argillite varies and is locally dominant. Thickness is 16 feet. Underlies the Scott member of the Day Point. The Head is of Middle Ordovician (Chazyan) age.

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


Map showing publication footprint
  • Usage in publication:
    • Head Siltstone‚Ć
  • Modifications:
    • Not used
  • AAPG geologic province:
    • New England province
Publication:

Fisher, D.W., 1977, Correlation of the Hadrynian, Cambrian, and Ordovician rocks in New York State: New York State Museum Map and Chart Series, no. 25, 5 sheets, 75 p.


Summary:

The Head Siltstone is "abandoned" in New York and replaced by the Ste. Therese Siltstone.
[Technically, not abandoned because type locality is in Vermont. However, name is discarded from New York Geol. Survey nomenclature.]

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


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).