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Geologic Unit: Northfield
Map showing publication footprint
  • Usage in publication:
    • Northfield conglomerate
  • Modifications:
    • Original reference
  • AAPG geologic province:
    • New England province
Publication:

Richardson, C.H., 1919, The Ordovician terranes of central Vermont, IN Perkins, G.H., Report of the State Geologist on the mineral industries and geology of Vermont, 1917-1918: Vermont Geological Survey [Report of the State Geologist], 11th, p. 45-51.


Summary:

[Suggests Northfield conglomerate as name for geologic equivalent of Irasburg conglomerate in Northfield and Roxbury Townships. See 1919 entry under Irasburg conglomerate.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1512).


Map showing publication footprint
  • Usage in publication:
    • Northfield phase
  • Modifications:
    • Revised
  • AAPG geologic province:
    • New England province
Publication:

Richardson, C.H., 1929, The petrography of the Irasburg conglomerate, IN Perkins, G.H., Report of the State Geologist on the mineral industries and geology of Vermont, 1927-1928: Vermont Geological Survey [Report of the State Geologist], 16th, p. 107-110.


Summary:

Pg. 107-110. Northfield phase of Irasburg conglomerate. Is characterized by pebbles of devitrified rhyolite embedded in a paste of clay slate from which Ruedemann identified Deepkill (Beekmantown) fossils.

Source: US geologic names lexicon (USGS Bull. 896, p. 1512).


Map showing publication footprint
  • Usage in publication:
    • Northfield conglomerate
  • Modifications:
    • Overview
  • AAPG geologic province:
    • New England province
Publication:

Richardson, C.H., and Maynard, J.E., 1933, The geology and petrography of Athens, Brookline, and Westminster, Vermont, IN Perkins, G.H., Report of the State Geologist on the mineral industries and geology of Vermont, 1931-1932: Vermont Geological Survey [Report of the State Geologist], 18th, p. 316-347.


Summary:

Pg. 346. The Irasburg, Albany, and Northfield conglomerates form base of Ordovician in eastern Vermont.

Source: US geologic names lexicon (USGS Bull. 896, p. 1512).


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 ([ ]).

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