Burlington Formation named. Consists of gneiss, quartzite, amphibolite, and metamorphosed boulder conglomerate. Unit is white, pale-gray, dark with white pin-stripe. Contains relict sedimentary structures. 300 m thick at type section. Overlies Greenleaf Mountain Formation and Middlesex Fells Volcanic Complex; underlies Marlboro Formation. Age is pre-Silurian (late Precambrian? to Ordovician?).
Source: GNU records (USGS DDS-6; Reston GNULEX).
Age of Burlington Formation changed from pre-Silurian to Proterozoic Z.
Source: GNU records (USGS DDS-6; Reston GNULEX).
Burlington Formation not shown on map. [No explanation. Still good usage.]
Source: GNU records (USGS DDS-6; Reston GNULEX).
Burlington Formation as defined by Bell and Alvord (1976) was included in Westboro Formation on MA State bedrock geologic map by Zen and others (1983) because of its similar quartzitic composition and to decrease the number of small or thin units on the State map. Report includes geologic maps and correlation charts. [Burlington still good usage; no intent to abandon stated. Chapters A-J in U.S. Geological Survey Professional Paper 1366 are intended as explanations and (or) revisions to 1:250,000-scale MA State bedrock geologic map of Zen and others (1983).]
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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