New Haven Arkose (MATRn;0)

New Haven Arkose - Red, pink, and gray coarse-grained, locally conglomeratic arkose interbedded with brick-red shaley siltstone and fine-grained arkosic sandstone; boundary between Lower Jurassic (Jn) and Upper Triassic (TRn) parts is arbitrarily drawn through clastic rocks of similar lithology below gray mudstone containing Lower Jurassic palynofloral zone; TRn is continuous with and lithically similar to TRs near Northampton. Assigned to Newark Supergroup (Robinson and Luttrell, 1985).

State	Massachusetts
Name	New Haven Arkose
Geologic age	Upper Triassic
Original map label	Trn
Comments	Part of Mesozoic Basins (Jurassic and Triassic Rocks); Sedimentary and Volcanic Rocks of Hartford Basin. Description for Jn and TRN are combined and hard to seperate on printed map; so used for both units. Secondary unit description per MA003.
Primary rock type	arkose
Secondary rock type	siltstone
Other rock types	mudstone
Lithologic constituents	Major Sedimentary > Clastic > Siltstone (Bed)brick-red shaley siltstone Sedimentary > Clastic > Sandstone > Arkose (Bed)red, pink, and gray coarse-grained, locally conglomeratic arkose
Map references	Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references	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. Robinson, Peter and Luttrell, G.W., 1985, Revision of some stratigraphic names in central Massachusetts, IN Stratigraphic notes, 1984: U.S. Geological Survey Bulletin, 1605-A, p. A71-A78. [http://pubs.er.usgs.gov/publication/b1605A]
Geographic coverage	Berkshire - Franklin - Hampden - Hampshire