East Berlin Formation

Reddish-brown to pale red arkosic sandstone and siltstone, and gray sandstone, gray mudstone, and black shale; interpreted as lake beds. Assigned to Newark Supergroup (Robinson and Luttrell, 1985). 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).
State Massachusetts
Name East Berlin Formation
Geologic age Lower Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed, Arkosic)
Sedimentary > Clastic > Sandstone (Bed, Arkosic)gray sandstone and arkosic sandstone
Minor
Sedimentary > Clastic > Mudstone (Bed)
Incidental
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).
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., and Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.

https://pubs.er.usgs.gov/publication/70046713

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.

https://pubs.er.usgs.gov/publication/b1605A

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/

https://ngmdb.usgs.gov/Geolex/search

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