Newport Group - Fort Adams Formation

Large clasts of dolostone and quartz arenite (olistoliths) enclosed within a matrix of tuff, siltstone, slate, and conglomerate; interpreted as an olistostrome.
State Rhode Island
Name Newport Group - Fort Adams Formation
Geologic age Late Proterozoic? or older?
Lithologic constituents
Major
Sedimentary (Olistrostrome)Large clasts of dolostone and quartz arenite (olistoliths) enclosed within a matrix of tuff, siltstone, slate, and conglomerate; interpreted as an olistostrome.
Comments Part of Esmond-Dedham Subterrane (East Bay Area)
References

Hermes, O.D. (comp.), Gromet, L.P. (comp.), Murray, D.P. (comp.), Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Map Series No. 1, Kingston, Rhode Island, scale 1:100,000.

NGMDB product
Counties Newport