|Name||East Berlin Formation|
|Geologic age||Lower Jurassic|
Sedimentary > Clastic > Siltstone (Bed, Arkosic)
Sedimentary > Clastic > Sandstone (Bed, Arkosic)gray sandstone and arkosic sandstone
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Mudstone > Shale > Black-shale (Bed)
|Comments||Part of Mesozoic Basins (Jurassic and Triassic Rocks); Sedimentary and Volcanic Rocks of Hartford Basin. Secondary unit descriptions per MA003, MA004 as reported in USGS Geologic Names Lexicon (ref. MA024): The East Berlin Formation of the Hartford basin contains eight facies: trough cross-bedded sandstones, horizontally stratified sandstones, interbedded sandstones and mudrocks, ripple cross-laminated siltstones, black shales, stratified mudrocks, disrupted shales, and disrupted mudstones. These facies are interpreted as a continental depositional system and are divided into two assemblages. Sandflat/alluvial plain facies assemblage (sandstones and siltstones) is composed of sheet-flood deposits. The lacustrine assemblage (shales and mudrocks) represents a saline lake-playa system (Gierlowski-Kordesch, and Rust, 1994).|
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., and 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.
Gierlowski-Kordesch, Elizabeth and Rust, B.R., 1994, The Jurassic East Berlin Formation, Hartford basin, Newark Supergroup (Connecticut and Massachusetts); a saline lake-playa-alluvial plain system, IN Renaut, R.W., and Last, W.M., eds., Sedimentology and geochemistry of modern and ancient saline lakes: Society of Economic Paleontologists and Mineralogists Special Publication, no. 50, Symposium, Saskatoon, Saskatchewan, August, 1991, p. 249-265, International Geological Correlation Programme (IGCP) Project No. 219/324.
USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/
|Counties||Hampden - Hampshire|