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Geologic Unit: Coventry
Map showing publication footprint
  • Usage in publication:
    • Coventry conglomerate
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Conglomerate
  • 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:

Pg. 47. Coventry conglomerate. Appears 10 miles north of Irasburg, Orleans County, northeastern Vermont. Contains quartz pebbles 1 inch to 1 foot diameter and fragments of Cambrian schist which are occasionally at right angles. Also carries angular fragments of Ordovician slate and limestone. It is a meta-conglomerate, for the lime has been calcitized. Can not be contemporaneous with Irasburg conglomerate. May have been formed at close of Ordovician or may represent a fault breccia.

Source: US geologic names lexicon (USGS Bull. 896, p. 533).


Map showing publication footprint
  • Usage in publication:
    • Coventry 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. Coventry phase of Irasburg conglomerate. Is markedly different from any of the other phases of that formation. It is characterized by well-rounded, smoothed, sometimes faceted and sometimes apparently striated boulders of pure white quartz from an inch to a foot in diameter. Fragments of Cambrian schists up to 1 foot in diameter and set at right angles to each other are embedded in an Ordovician paste of limestone and slate. Writer believes this rock is a fault breccia conglomerate. This breccia-conglomerate is located about 10 miles north of Craftsbury, near contact of Cambrian and Ordovician terranes. Main road from Newport to South Troy passes over this terrane [and crosses northern part of Coventry Township, Orleans County, northeastern Vermont]. Age is Early Ordovician.

Source: US geologic names lexicon (USGS Bull. 896, p. 533).


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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