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|Geologic age||Lower Jurassic|
|Original map label||Jhv|
|Comments||Part of Mesozoic Basins (Jurassic and Triassic Rocks); Sedimentary and Volcanic Rocks of Hartford Basin. Secondary unit description per MA003 as reported in USGS Geologic Names lexicon (ref. MA024): The use of the name Hitchcock Volcanics follows that of Brophy and others (1967) and is assigned to the Newark Supergroup. It consists of nested cones of basaltic breccia containing abundant fragments of New Haven Arkose, locally intrusive into arkose near the base. It underlies the Shuttle Meadow Formation and (or) the Holyoke Basalt. Age is changed from Late Triassic to Early Jurassic (Robinson and Luttrell, 1985).|
|Primary rock type||volcanic breccia (agglomerate)|
|Secondary rock type||arkose|
|Other rock types|
Sedimentary > Clastic > Sandstone > Arkosecontaining abundant fragments of New Haven Arkose (Jn, TRn)
Igneous > Volcanic > Mafic-volcanic > Basalt (Volcaniclastic, volcanic breccia)nested cones of basaltic breccia
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
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