Potsdam group

Pots´dam group`

1.(Geol.) A subdivision of the Primordial or Cambrian period in American geology; - so named from the sandstone of Potsdam, New York. See Chart of Geology.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
It recognised that some EU countries had an important role to play as members of the Potsdam Group (Denmark, Germany, Italy, Finland, Lithuania and Poland) in veterinary negotiations with third countries.
Pickering's haste to produce Harvard Photometry led to numerous misidentifications and unacceptably large photometric errors compared to the Potsdam group of Paul Kempf and Gustav Muller.