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  • Usage in publication:
    • Cliff Walk Granite
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Granite
    • Granodiorite
  • AAPG geologic province:
    • New England province
Publication:

Skehan, J.W., and Rast, Nicholas, 1990, Pre-Mesozoic evolution of Avalon terranes of southern New England, IN Socci, A.D., Skehan, J.W., and Smith, G.W., eds., Geology of the composite Avalon terrane of southern New England: Geological Society of America Special Paper, 245, p. 13-53.


Summary:

Cliff Walk Granite is here proposed to replace informal Newport granite of earlier reports. [Also called Lily Pond Granite by Skehan and others (1987)]. Exposed along eastern shore of Newport, RI. Described as gray, pink, and greenish massive aplitic to porphyritic granite to granodiorite. Mainly coarse grained with pink phenocrysts of microcline. Groundmass consists microperthite, orthoclase, albite-oligoclase, quartz, biotite, hornblende, and chlorite. Rb/Sr whole rock age of 595+/-12 Ma determined by Smith and Giletti (1978). Intrudes Price Neck Formation.

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 ([ ]).

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